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shinyquagsire23 · 4 years ago

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Tying It All Together - Pwning To Own on LG phones

Last year I detailed a secure EL3 vulnerability which affected (and still affects, for devices with discontinued updates) LG Android devices. However, this vulnerability alone isn't actually all that useful for a number of reasons, the more immediate being that many phones simply do not allow writing to eMMC without root or a custom recovery. Additionally, gaining full control over all privilege levels requires draining the battery to below 0%, which while it would be possible to create a modchip that facilitated this, is impractical. To finish off my exploit chain, I would like to detail two additional vulnerabilities that I have found and utilized in my coldboot process. It's worth noting though that these vulnerabilities were reported to LG and may be patched on updated units.

Live, LAF, Love

The first exploit is an obvious necessity: In order to write the rle888 payload into the eMMC's boot graphics, I need to be able to achieve an arbitrary partition write. While exploiting Android *is* an option for this (as are hardware methods), I instead opted to attack LAF, LG's recovery/flashing component. While many Android phones in the past have used fastboot in order to flash radios and other system components to eMMC, fastboot has been completely removed on the Q710/Q720. Some phones such as the Nexus 5 actually maintain both fastboot methods and LAF, but for maximum spread, LAF is the clear target.

LAF is designed to work with LGUP, a frequently-leaked LG-internal flashing tool that allows flashing KDZ update files. While LAF in the past was able to read and write eMMC partitions without any restriction, in recent years LG has opted to sign all of their KDZ files in order to make it more difficult for things like cross-carrier flashing, version mixing/matching between partitions and other modifications to occur. Flashing is done via USB, and most of the protocol has been documented at https://github.com/Lekensteyn/lglaf.

The LAF update process largely consists of an ioctl-over-USB shim: The OPEN command is able to open a partition block device, and READ/WRTE will seek into the file and write contents. However, reading and writing are explicitly blocked until a list of partitions, their eMMC offsets, their KDZ content offsets, and their content hashes is sent via the SIGN command, all of which is hashed and signed by LG. If the contents of the partitions in the KDZ are modified, the partition list hashes will fail to verify, and modifying the hashes in the partition list will make the SIGN check fail. The private key is not stored in LGUP; KDZs are downloaded from LG's servers, signed presumably by their build servers.

So, how can we manage to activate WRTE commands, with valid partition content hashes of our arbitrary contents, if we cannot sign our own? To start, I investigated how the WRTE commands actually handled hash checking--if the partition list is sent with SIGN, then at some point the WRTE command must be able to figure out which partition the current write is for, and the current partition's contents must be buffered in RAM somewhere along with an updating SHA context, because if the SHA check fails, then it shouldn't write at all. As it turns out, most of the checks in this area were fairly solid (the write must be in the range of a partition in the list, the entire transaction is one bulk packet of the hashed size, etc). However, this led me to realize: The partition list signature is only checked once, and there is nothing stopping me from, say, sending another SIGN command.

The SIGN verification process works as follows:

The partition information is sent along with a signature in one bulk transaction.

The partition information is copied into a global .bss array from the USB buffer with a fixed size.

The partition information hash buffer is prepared: An allocation is made for N partitions and an optional string, the string being the device model (to prevent cross-flashing). The number of partitions is determined by a signed portion of the header. If the allocation fails, an error is returned.

The partition information is copied again into this allocation along with the string, and the contents are hashed. The signature is crypted with the public key and the signature hash is verified against the partition info hash. If the check fails, the global .bss array is cleared and an error is returned. If the check passes, some write threads and structs are initialized and a success value is returned.

The .bss buffer storing partition info (used by other functions) is copied to before the packet is verified

The .bss buffer is cleared when the signature mismatches, but not with this malloc fail...?

The flaw here is subtle, but not terribly difficult to notice: The number of partitions is user-controlled even though it is signed, and the partition info was copied into a global variable before verification. In all other error conditions, LAF will memset the partition information before returning an error code, however if the hashing allocation fails (ie by setting the number of partitions to -1), then the allocation will fail and an error is returned without clearing the partition information. Thus, we can fakesign our own update KDZs by

Sending a valid SIGN command, which will start the write threads

Sending a fakesigned SIGN command with the number of partitions set to -1, and all partition information set however we want. The partition information in .bss is now set without a signature being checked.

While this fakesign has the potential to hang WRTE commands while due to the number of partitions being set much larger than the global partition array, all loops when WRTE checks the partition list hashes will break once a valid partition is found. So, as long as the hash contents of the WRTE command are existent in the first few entries, it will not hang, however any writes sent that do not match will hang lafd.

Another S-EL3 vuln to wrap it all up

This might seem a bit pointless given that the former vulnerability paired with 🔋 📱❄️🥾🔓 at aboot is more than enough to unlock bootloaders, since aboot is usually the code that handles bootloader unlocking/wiping/boot image signature verification, but the downside to unlocking your bootloader is that you lose SafetyNet. To most effectively mitigate SafetyNet issues you basically need an S-EL3 exploit in order to patch Qualcomm's TrustZone to spoof a locked bootloader. While 🔋 📱❄️🥾🔓 has a vector for S-EL3 code execution via SBL1 and its charging graphic, it only triggers at extremely low battery voltages and it would be more convenient to find an alternative means to gaining S-EL3 code execution via aboot, which runs at EL2/EL1.

One of the first things I noticed when I began to look for SBL vulnerabilities, and actually the reason I looked at SBL in the first place is its crash handler. Since at least the Nexus 5, LG has shipped its "Demigod Crash Handler" which can print registers and stack information and RAM console logs from EL1 kernel, S-EL3 SBL, TrustZone, etc. I first discovered it while trying to exploit a kernel stack overflow. It also allows the user to dump memory contents over USB via its Sahara protocol which also gets used in PBL for Firehose bootstrapping.

Naturally, SBL cannot know the exact details of every execution environment it displays stack dumps for, it requires the faulting environment to store that information before warm-resetting into SBL. Consequently, this means there are portions of RAM writable by EL1 which will be later parsed at an S-EL3 execution level, and of course to make matters worse it also expects EL1 to handle the memory allocation for both the RAM console as well as for the framebuffer. These structures are also plainly visible in LG's kernel sources available in their Android OSS zips.

Above roughly shows the arbitrary write which is possible with this ramconsole parsing. The ramconsole offset is not bounds checked, so we are able to achieve an arbitrary write to a limited set of addresses based on ramconsole_offs, the limit being that the offset factors both into what you write and where you write it. However, I found that since DRAM takes up such a significant portion of the address space, it was more than enough to specifically write a function pointer to the stack. To keep the exploit as simple as possible, I chose to force console_init_maybe to return to the missing battery graphic draw routine, which then triggered 🔋 📱❄️🥾🔓 without the need to drain the battery below 1% and made loading additional payloads significantly easier.

As an interesting sidenote, this vulnerability is extremely similar to hexkyz's Wii U boot1 exploit, which also abuses warmboot behavior to take over the secondary bootloader of the Wii U's ARM boot processor. In that case, however, the Wii U encrypted its PRSH/PRST structure in RAM, and rather than displaying syslogs, it uses the structure to store boot timings and other info between IOS reboots.

For most practical usecases, this vulnerability is a bit difficult to exploit, due to SBL's text and stack differing between devices. However, S-EL3 vulnerabilities aren't all that frequently documented on Android, so I hope that it will at least be useful for anyone interested in examining Qualcomm's TrustZone components or avoiding weird SafetyNet junk.

Code for both of these exploits can be seen at https://github.com/shinyquagsire23/Q710-SIGNhax-EL3-Warmboot

#LG #SBL1 #S-EL3 #exploit #bootloader unlock #SIGNhax

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drrubinspomade · 5 years ago

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#el3 imagery

Yes, Yes, Yes. And GREETINGS FROM LOS ANGELES.

This photo was harvested along one of our travels through the interwebs. If you like what you see, we urge you to further investigate the creator(s) and/or subject(s) of the above work and follow them, fan them, hire them.

If, on the other hand, you’d like us to remove; or you know who made this so that we can credit; holler POST HASTE.

DrRubins.com

Gracias.

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tekamedia · 5 years ago

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Elizabeth Hurley's son Damian wins multi-million dollar inheritance battle: report

New Post has been published on https://newsprofixpro.com/tekamedia/2019/07/21/elizabeth-hurleys-son-damian-wins-multi-million-dollar-inheritance-battle-report/

Elizabeth Hurley's son Damian wins multi-million dollar inheritance battle: report

Elizabeth Hurley’s son Damian will inherit some of his dad’s multi-million family fortune – despite his grandad’s attempt to cut him out, reports claims. Damian, 17, whose dad is millionaire Steve Bing, had been told he would not get any money from the trust… Read More

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tuyetthienduong · 6 years ago

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tippytopshapeusa · 6 years ago

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#BREAKING_Daily_INTEL_Report #Please_share+ #NocNoc + #TicToc (:-)(-:)🔮(:-)(-:) * @Melanie83000680 @hwt123 @worldgoneweirde @LauraHa69544517 @JulieHarris05 @usnews24x7 @lizcabrera55 @EnglishMist117 @Ecomemory1 * #STOPTheCaravan #JobsNotMobs #KAG2020 #MAGA #WWG1WGA #PCM1A1 #abc #arc #dqm #jad #lfls #STR8TalkWithLeo * ~ #EL3 #Reddit - #history - #IonceheardthattheUSneverattackedacountrywithaMcDonaldsinit. #Isthistrue? https://www.google.com/amp/s/amp.reddit.com/r/history/comments/4nn228/i_once_heard_that_the_us_never_attacked_a_country/ #Non-official #cover - #Wikipedia https://en.m.wikipedia.org/wiki/Non-official_coverIs it true that no country with a #McDonaldshaseverattackedtheUnitedStates? | #YahooAnswers https://answers.yahoo.com/question/index?qid=20110417091050AAPhfTu #TheendoftheGoldenArchesdoctrine https://www.google.com/amp/s/amp.ft.com/content/1413fc26-f4c6-11e4-9a58-00144feab7de #10countriesthatbannedMcDonalds https://www.telegraph.co.uk/travel/lists/the-countries-that-banned-mcdonalds/ https://www.instagram.com/p/BqNxeSknlDy/?utm_source=ig_tumblr_share&igshid=10c00qtzkr7v9

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jasondyinternational · 7 years ago

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IG | @jasonjamesdy: #OOTD for sir EL3's birthday. Happy Birthday sir Gabby! 🎉 Styled by @perrytabora Grooming by @mabeth_concepcion . . . #JasonDy #TheVoiceOfRNB #Dyfenders #InMyHead #abscbn #Dapper #MensFashion http://ift.tt/2w03gUr

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desdesdr · 8 years ago

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1905:estación de la Costa

CANTABRIA Y SANTANDER EN EL RECUERDO

En Santander, la primitiva estación del Ferrocarril de Isabel II (más tarde de la Compañía del Norte), que unió la capital cántabra con Alar del Rey y el Canal de Castilla en 1866, se ubicó entre el puerto, junto al antiguo Muelle de las Naos y el nuevo Muelle de Maliaño, y los terrenos del proyectado Ensanche del mismo nombre.

Muy cerca se emplazaron las estaciones de la línea de Ontaneda (1902) y del Ferrocarril de la Costa (1907), común a los ferrocarriles de vía estrecha que enlazaban Santander con Bilbao y Oviedo.

El complejo portuario-ferroviario así formado ha pervivido casi hasta nuestros días ya que ambas estaciones subsistieron hasta 1937, cuando fueron unificados los recintos ferroviarios y construidos en su localización actual, levemente retranqueada respecto a la posición originaria.

Por unos y otros motivos, las estaciones ferroviarias permanecieron sin tener un enlace directo con el centro urbano hasta que, en el contexto del proceso de reconstrucción de la ciudad tras el incendio de 1941, se realizó el desmonte y rebaje de parte de la alargada culminación que separaba el casco urbano de la costa y se procedió al trazado de varias vías en disposición trasversal, incluido el Pasaje subterráneo de Peña.

FERROCARRIL ISABEL II El ferrocarril de Santander a Alar del Rey pretendía enlazar el Canal de Castilla con la costa cantábrica, para facilitar así el transporte de mercancías, especialmente los trigos y harinas de Castilla.

En 1844 el Marqués de Remisa (socio principal de la Compañía del Canal de Castilla) y el Duque de Sotomayor se hicieron con la concesión y encargaron al ingeniero de caminos Juan Rafo el estudio del trazado, con dos puntos fijos: inicio en Alar del Rey y finalización en el Puerto de Santander.

Muerto el Marqués de Remisa, principal inversor y defensor del eje, en 1848 una Real Orden retiró la concesión del ferrocarril, aunque al año siguiente surge con fuerza una nueva concesión que posteriormente fue transferida a una recién creada asociación formada por la Diputación, el Ayuntamiento y la Junta de Agricultura y Comercio de Santander, que por Real Orden de 21 de Abril de 1850 se denominó de Isabel II.

Lo cierto es que la Compañía de Isabel II inició sus tareas en condiciones muy ventajosas a pesar de que tardó tiempo en funcionar.

El 8 de abril de 1852. la reina firmó una Real Orden, disponiendo el comienzo de los trabajos según el proyecto del ingeniero Juan Rafo.

Apenas tenía dificultad construir los 50 km. que separaban Alar del Rey de Reinosa, el 28 de marzo de 1857 se inaugura el tramo de Alar del Rey a Reinosa.

El primer tramo para construir fue el Alar-Reinosa en Santander, celebrándose la inauguración de la obra con gran festejo los días 2, 3 y 4 de mayo de 1852, asistiendo D. Francisco de Asís Borbón. esposo de la reina y el ministro de Fomento, D. Mariano Miguel de Reinoso.

Hacía tres siglos que la familia real no visitaba la ciudad, que se volcó en manifestaciones de entusiasmo ante la presencia regia.

En estos términos quedó redactada la crónica del día que comenzaron las obras, que después nos ha legado Simón Cabarga:

"La noche del día uno de mayo hizo posada en Ontaneda.

La muchedumbre se agitaba apretujándose desde la Alameda Segunda hasta La Ribera.

Los carruajes del municipio partieron hasta Peñacastillo donde el Alcalde Gallo Alcántara dio la bienvenida al monarca que llegaba acompañado por el ministro de Fomento, Reinoso, y el mayordomo mayor.

En la loma de Cato se les unió la comisión concesionaria del ferrocarril, con un plantel de ingenieros ingleses y españoles, y la comitiva descendió entre un clamoreo, frenético hasta Cuatro Caminos.

Bajo el primer arco de triunfo esperaba al monarca un grupo ... Y allí sonó por vez primera la Marcha Real en Santander en homenaje a un rey.

Siguió el cortejo su marcha Alameda Segunda abajo. Un testigo anotó cómo sucedió todo...

Tres eran los arcos de cuarenta pies de altura que jalonaron el camino desde Cuatro Caminos y había que añadir el agobiante exorno del puente de Vargas sobrecargado de banderas y banderolas y de guirnaldas...

Al llegar a la Ribera contempló una estampa ... en la larga perspectiva del muelle cuyas casas aparecían cuajadas de banderas; y en la Dársena los marineros se mantenían equilibristas en las vergas de la aparatosa arquitectura de los veleros .

El soberano echó píe a tierra ante la Aduana, habilitada para su residencia... "

A orillas de la bahía tuvo lugar el acontecimiento de la celebración.

De las Memorias de Pedro de Becedo, según trascripción de José Simón Cabarga, se puede leer:

"También he visto hace unos días en el mismo salón concejil una carretilla que es obra artesana primorosa de roble, delicadamente tallada y con aplicaciones de plata bien labrada, así como una pala igualmente con guarniciones de plata.

Sirvió este curioso artilugio para acarrear la primera paletada de tierra para la iniciación de las obras, en la loma de Cajo, y fue regalada a la ciudad por la empresa inglesa constructora.

Debajo de la corona real y sobre el escudo de la casa reinante, hay una placa de plata con esta inscripción.

«S. M. la Reina y en su nombre su augusto esposo, el Rey inauguró el ferrocarril de Isabel II en Santander el3 de Mayo de 1852.

Señor Reinoso, ministro de Fomento, Georg Mould, contratista, A. S. Jee, Ingeniero jefe»".

LA ESTACIÓN DEL NORTE

La Estación del Norte estaba en el lugar que actualmente ocupa la estación de autobuses, fue proyectada por el ingeniero Eduardo Grasset en 1870 y poseía una marquesina diseñada en los talleres de Gustave Eiffel, fue derribada en 1936.

LA ESTACIÓN DE LA COSTA

El ingeniero inglés William Atkinson fue el encargado de dirigir las obras del ferrocarril y además de realizar un album fotográfico de las obras para la reina Isabel II, que se conserva en el Archivo General del Palacio Real. George Mould, contratista inglés, fue el encargado de las obras, presupuestadas en 120 millones de reales.

La construcción del ferrocarril se produjo por la necesidad de llevar el cereal de Castilla al puerto de Santander para su exportación a Inglaterra. En Alar, se almacenaban el grano y harina, su salida al mar desde allí era muy dificultosa, el transporte.

La Estación de Ferrocarril de la Costa dio servicio desde 1902 hasta 1936 a la compañía del Cantábrico y a la línea Santander-Bilbao. Fue derribada por orden del alcalde Ernesto del Castillo Bordenave, ‘el Piqueta.

RENFE

El 28 de agosto de 1940, Alfonso Peña Ministro de Obras Públicas puso la primera piedra de la nueva estación que pretendía sustituir a la antigua estación del Norte que era la que usaba el ferrocarril de ancho ibérico.

Prácticamente tres años después, el 26 de agosto de 1943 fueron inauguradas las nuevas instalaciones propiedad de RENFE que en 1941 se había hecho con toda la red ferroviaria española tras la nacionalización de la misma.

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shinyquagsire23 · 4 years ago

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🔋 📱❄️🥾🔓, an EL1/EL3 coldboot vulnerability affecting 7 years of LG Android devices

I should probably preface all of this by saying that I'm not really a security professional in the sense that I don't actually do security stuff for a living; I reported this vulnerability in March and gave a 90 day delay on releasing specific details mostly just because that's A Thing That Security Researchers Do. Also the vulnerability doesn't require user interaction from coldboot so it's a bit nasty in that regard. But also this vulnerability sat around for 7 years so it could be argued that, if anything, 90 days is too long.

Anyhow jumping into things, this is a writeup documenting CVE-2020-12753, a bootloader vulnerability affecting most Qualcomm-based LG phones since the Nexus 5, all the way up to the my test device, the LG Stylo 4 Q710 (and 5 Q720), and probably others. While working on the implementation of this vulnerability I thought it was odd how few bootloader vulnerabilities for Android actually get properly documented, and given the sheer spread of affected devices of this particular vuln I thought it'd be interesting to document it in detail.

A Quick Primer on the (Qualcomm) Android Boot Process

The device I'm working with, the Stylo 4, operates on 2013-2016 variant of Qualcomm's boot sequence described at https://lineageos.org/engineering/Qualcomm-Firmware/:

- On power-on, the Primary Bootloader (PBL) initializes DRAM, eMMC, etc and then loads and verifies SBL1 (Secondary Bootloader 1) from eMMC. - SBL1 then loads and verifies the Trusted Execution Environment (TEE), aboot, and a few other bits and pieces and then jumps to the TEE, in this case Qualcomm's Secure Execution Environment (QSEE) - QSEE sets up secure EL3/EL1 (TrustZone) and jumps down to aboot (non-secure EL1) - aboot loads and verifies the Linux kernel and jumps to it

Some Android devices allow "bootloader unlocking", which allows unsigned kernels to be loaded and run. Generally this unlocking occurs via aboot, and the implementation varies from vendor to vendor, however in most cases what happens is that a fastboot command gets sent to the phone to unlock/lock the phone, and as part of Android's Verified Boot, the phone's storage is wiped on this transition. There's also some requirements on user verification so that, in theory, this unlock cannot occur without user interaction.

Additionally, with verified boot enabled, Android will use dm-verity to verify all files on the root/system partition, and SELinux is run as Enforcing.

Variants on the Boot Process, added by LG

In practice, the boot process isn't quite so simple: Vendors are able to add modifications to the boot process as they see fit. In LG's case, these differences can be summarized as follows: - Hardware bringup in SBL for charging PMICs, LEDs, and other misc hardware - Misc logging/debugging modifications - Additional TEE processes for SIM unlocking, backed by RPMB - In aboot, vendor-specific fastboot commands (or no fastboot at all in the case of my device), restrictions on unlocking via certificates, verification modifications, additional boot args for Linux, etc - Vendor-specific recoveries/flashers, LAF in the case of LG

While I initially started in a privesc from within Linux (and got ~close to getting kernel execution), Google has done a lot of work to ensure that vendors can’t mess up Android security. However, bootloaders have a lot less oversight, so going after these vendor-specific bits of hardware bringup seemed extremely opportune for errors.

Introducing: raw_resources

At an undetermined point in time (likely prior to the Nexus 5 releasing), LG added an "imgdata" partition on eMMC to store boot graphics for Download Mode, fastboot graphics, charging graphics, the unlock graphic and so on. Image data is stored RLE compressed and for each image, metadata for the image width, height, x and y position are specified. The Nexus 5’s final bootloader image, as far as I can tell, only accesses this partition from aboot; SBL1 is not affected on this device. For the curious, I have a Python3 script which can extract these images at https://gist.github.com/shinyquagsire23/ba0f6209592d50fb8e4166620228aaa5.

A few examples of Nexus 5 imgdata resources

imgdata later became raw_resources, and at an undetermined point, the same RLE decompression and metadata interpreting was copied into SBL1 for use in boot paths where the battery has discharged significantly. If the battery is discharged too far, SBL1’s pm_sbl_chg_check_weak_battery_status will display LGE_PM_NO_CHARGER for boot attempts made without a charger connected, LGE_PM_WEAK_CHARGING_ON for boot attempts with a charger connected, and LGE_PM_NO_BATERY_ANI_* for boot attempts made without a battery. A script for extracting raw_resources can be found at https://gist.github.com/shinyquagsire23/b69ca343fd2f246aee882ecb5af702bd.

A few examples of Q710 resources

On normal boot paths, aboot reads raw_resources to display the boot logo, download mode graphic, and verified boot statuses for devices which allow unlocking. In my case, the Q710/Q720 does not allow for unlocking, so this boot path is never reached on these devices. However, the graphics still exist I guess on the off chance that they allowed it to happen.

For the C inclined, the format of raw_resources can be summarized in these structs: typedef struct boot_img_header { char magic[0x10]; uint32_t num_imgs; uint32_t version; char device[0x10]; uint32_t signature_offs; } boot_img_header;

typedef struct img_info { char name[0x28]; uint32_t data_offset; uint32_t data_size; uint32_t width; uint32_t height; uint32_t offs_x; uint32_t offs_y; } img_info;

The following calculation is performed in order to determine the output pointer to be used during decompression: bpp = 24 screen_stride = fbinfo->screen_width; fbuf_offset = offs_x + (screen_stride * offs_y); fbuf_out = (fbuf_offset * (bpp / 8)) + fbinfo->buffer;

offs_x and offs_y are not bounds checked, and fbinfo->buffer is known in SBL1 and aboot, allowing for a controlled arbitrary write in both environments.

SBL1 load_res_888rle_image Arbitrary Write

This boot path requires discharging the battery to below 0%. While this is less feasible for any practical usage, performing the arbitrary write at this point allows patching SBL1 to disable signature verification before TEE and aboot are loaded. Any of the LGE_PM_* images can be hijacked selectively for arbitrary code execution, though for my PoC I used LGE_PM_NO_CHARGER specifically because I didn't want to accidentally brick myself (or well, I didn't want to have to beep out eMMC wires on the board to unbrick).

A 32-bit x offset can be calculated for any given address divisible by 3 using the following calculation: offset_x = (((0x100000000 + target_addr) - 0x90000000) / 3) & 0xFFFFFFFF

Data written to this arbitrary address can be kept contiguous by specifying the image width to be the same as the screen width. The height should then be rounded up from the payload size to ensure all data is written properly. So really by the end, this isn't an arbitrary write so much as it is an arbitrary memcpy at Secure EL3.

aboot Arbitrary Write

The aboot arbitrary write functions identically to SBL1: Any image can be selected to perform the arbitrary write. Most notably, this includes any lglogo_image_* graphic, which is displayed by default on every boot. The framebuffer is generally fixed to address 0x90001000, which means that by using the arbitrary write to gain code execution, the original graphic which was used to obtain the arbitrary write can be written to the screen following hijacking to, in effect, make it appear as if boot flow has not been modified at all, for better or for worse.

A good question that might be raised after looking briefly at the structs earlier would be, "wait, there's a signature offset, why does any of this work if raw_resources contains a signature?" And yes, raw_resources contains a signature! But it's a useless signature because this signature is only checked in aboot while displaying verifiedboot_* images. At some point, XDA users found out that you could swap the LG boot logos over the verifiedboot_* images so that when they unlocked their devices they wouldn't have to see the AVB boot nag messages. Naturally, this defeats the point of Google's Verified Boot spec since it would potentially allow a bootloader be unlocked without the user knowing, so LG added a signature. But it’s only checked for the verified boot images.

As a minor note, unlike SBL1, aboot will also select between raw_resources_a and raw_resources_b depending on the A/B boot slot.

Practical Exploitation

I started by exploiting SBL1, partially because Secure EL3 is just cooler than nonsecure EL1, but also because the framebuffer address was more obviously seen than in aboot (though I later found the aboot framebuffer address anyhow). At this point in execution all of the hardware is initialized and no other bootloaders have been loaded, so we're basically free to patch sigchecks and control the entire phone!

As it turns out though, SBL1 takes a bit more work to actually exploit, because unlike aboot, its segments aren't set RWX. I'm not really sure why aboot has all of its segments RWX, like at that point it's more of a 'boot' than a 'secure boot' if they can't even bother to use the easiest security option available.

In any case, ROP is required briefly to bypass the MMU's NX bit. This isn't too terrible, since SBL1 actually has a routine we can jump to to disable the MMU, though it requires a bit of finnagling to get correct.

So in summary, the exploitation process goes as follows: - Flash raw_resources_a.img to eMMC (ie via kernel execution, LG LAF, soldered wires and a hardware flasher, etc). - For SBL1 hax, drain the battery to below 0%. For my Q710, I drained most of the battery by leaving the screen at max brightness with sleep disabled until the phone powered off on its own after several hours. To drain the remaining battery, I charged enough to enter LAF download mode and left it to drain with the screen on for 2-3 hours. - Hold Power and Volume Down until the phone restarts. If the phone discharged enough, the phone should restart into the payload. - The phone can be plugged in to boot into aboot and Android normally, but the payload will now execute every time the payload-injected graphic is displayed.

To exploit SBL1: - raw_resources_a is modified such that the x offset is set to 0x2801CF5C, the width to 1080, and the height to 5. This will decompress LGE_PM_NO_CHARGER (now containing the contents of payload.bin) to 0x08056E14, slightly higher than the stack pointer during decompression. - The image is decompressed and load_res_888rle_image exits. The previous LR has now been overwritten by a pointer to a Thumb-mode pop {pc} ROP slide, to account for possible offsetting error. - At the end of the ROP slide, the following ROP instruction sequence is executed:

pop {r4-r12, pc} ; r8 is now set to SBL1_ARM_MMU_DISABLE, and r12 is now set to SBL1_THUMB_BX_R8

pop {r4-r6, lr} ; LR is set to the payload pointer orr r12, r12, #0x1 bx r12 ; jump to SBL1_THUMB_BX_R8

bx r8 ; jump to SBL1_ARM_MMU_DISABLE with lr now set to our payload

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Proof-of-Concept, and Future Plans

For those interested in experimenting, a PoC can be found here. Note that this is specifically for the LG Q710, and contains offset specific to the AMZ LG Stylo 4 (Q710ULM, 20c_00_AMZ_US_OP_1121). I'm planning on polishing things up further, however my current boot takeover involves two other vulnerabilities that I'd like to give a bit more time to make sure they're actually fixed/close to being fixed before releasing.

In the meantime I'd be interested in seeing if anyone else is interested in porting this to other LG devices, since I only own a Nexus 5, a Q710 and a Q720. As it is, these vulns will allow bootloader unlocking at a minimum on most older Qualcomm LG devices, and secure EL3 on newer ones, which should be very interesting for anyone interested in finding vulnerabilities in QSEE/similar on LG devices.

#CVE-2020-12753 #exploitation #bootloader #Android #Android ROMs

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