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Aleph Security: Secure Boot vuln in Qualcomm OnePlus 2

OnePlus 2 Lack of SBL1 Validation Broken Secure Boot
Aleph Research Advisory
CVE-2017-11105

OnePlus 2 (a 2015 Qualcomm Snapdragon 810 device) successfully boots with a tampered Secondary Bootloader (sbl1) partition although it is digitally-signed, hence it is not validated by its Primary Bootloader (PBL), maybe due to lenient hardware configuration. Attackers capable of tampering with the sbl1 partition can then disable the signature validation of the rest of the bootloader chain and other SBL-validated partitions such as TrustZone and ABOOT.[…]

https://alephsecurity.com/vulns/aleph-2017026
https://alephsecurity.com/2017/05/11/oneplus-ota/
https://oneplus.net/
https://nvd.nist.gov/vuln/detail/CVE-2016-10370
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-8850
https://github.com/OnePlusOSS
https://oneplus.net/2/oxygenos

 

 

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Trust Issues: Exploiting TrustZone TEEs

by Gal Beniamini, Project Zero

Mobile devices are becoming an increasingly privacy-sensitive platform. Nowadays, devices process a wide range of personal and private information of a sensitive nature, such as biometric identifiers, payment data and cryptographic keys. Additionally, modern content protection schemes demand a high degree of confidentiality, requiring stricter guarantees than those offered by the “regular” operating system. In response to these use-cases and more, mobile device manufacturers have opted for the creation of a “Trusted Execution Environment” (TEE), which can be used to safeguard the information processed within it. In the Android ecosystem, two major TEE implementations exist – Qualcomm’s QSEE and Trustonic’s Kinibi (formerly <t-base). Both of these implementations rely on ARM TrustZone security extensions in order to facilitate a small “secure” operating system, within which “Trusted Applications” (TAs) may be executed. In this blog post we’ll explore the security properties of the two major TEEs present on Android devices. We’ll see how, despite their highly sensitive vantage point, these operating systems currently lag behind modern operating systems in terms of security mitigations and practices. Additionally, we’ll discover and exploit a major design issue which affects the security of most devices utilising both platforms. Lastly, we’ll see why the integrity of TEEs is crucial to the overall security of the device, making a case for the need to increase their defences. […]

 

https://googleprojectzero.blogspot.com/2017/07/trust-issues-exploiting-trustzone-tees.html

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Qualcomm seeks Firmware Security Researcher

I’m going to try and start to post the occasional relevant interesting job postings for security researchers or developers. I will try to use ‘job-posting” for the tag for all of them. If you think it’s a bad idea for this blog, or if you get the job based on this blog, leave a Comment. 😉

[…]Qualcomm Hardware Security team is looking for a Firmware Security Researcher to help drive security efforts in our System-On-Chip (SOC) solutions. In this role, the Firmware Security Researcher will work closely with the Hardware Design Team, Hardware Verification team, and the Software team to help find vulnerabilities in our products. This role entails using best practices to evaluate, asses, and report vulnerabilities in QUALCOMM products. A systematic approach to vulnerability discovery is essential. Knowledge gained will leverage into new security mitigations for our SOC solutions used in a wide range of products, including mobile devices, IOT, automotive, consumer networking gear, wearables, and embedded medical devices. As a firmware security researcher, it is essential that the candidate be able to develop proof-of-concepts to demonstrate the impact of the vulnerabilities that are discovered, to enable proper prioritization and communication of issues to internal teams and external customers. Communication skills are highly valued as the role will entail cross-department coordination with the various groups involved in Cybersecurity initiatives, and possibly presenting findings at security conferences.[…]

https://jobs.qualcomm.com/public/jobDetails.xhtml?requisitionId=1950936

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aboot-parser: Android bootloader parser

Script to parse Android bootloader (aboot) images, extract certificates and verify image signature. May not work on aboot from latest devices. Signature verification follows the ‘Secure Boot and Image Authentication Technical Overview’ whitepaper by Qualcomm. Cf.  https://www.qualcomm.com/documents/secure-boot-and-image-authentication-technical-overview/ Aboot header format as described in  http://newandroidbook.com/Articles/aboot.html See above article for more details about aboot. Inspired by https://github.com/kayrus/kc_s701_break_free
[…]

https://github.com/nelenkov/aboot-parser

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Qualcomm Secure Boot whitepaper released

This whitepaper provides an in-depth look at our signed ELF images format, the process of loading and authenticating those images, certificate chain contents, and supported signature algorithms.

https://www.qualcomm.com/documents/secure-boot-and-image-authentication-technical-overview

https://www.qualcomm.com/news/onq/2017/01/17/secure-boot-and-image-authentication-mobile-tech

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QualComm TrustZone MasterKeys extracted?

Kindly pointed out by a reader of the blog, laginimaineb has some more research going on for QualComm TrustZone, sounds non-trivial:

[Grr, when I paste an URL of a Twitter tweet, WordPress usually renders it, today, it is not, maybe it will before it posts it, unsure. I’ve extracted the text from the Tweets in case it does not.]

Just managed to extract the Qualcomm KeyMaster keys directly from TrustZone! Writeup coming soon 🙂 (1/2)

And wrote a script to decrypt all keystore keys. This can also be used to bruteforce the FDE passphrase off the device! (2/2)

This specifically is done on the Nexus 6, but I’ve also dabbled w/ the Nexus 5 and Moto X 2nd Gen

https://mobile.twitter.com/laginimaineb/status/737051964857561093
https://mobile.twitter.com/laginimaineb/status/737052350674817024
https://mobile.twitter.com/laginimaineb/status/737185999760052224
https://mobile.twitter.com/laginimaineb/status/737186295655596032
https://mobile.twitter.com/laginimaineb/status/737188674371215360

More info:
https://mobile.twitter.com/laginimaineb
http://bits-please.blogspot.co.il/2016/05/qsee-privilege-escalation-vulnerability.html
http://bits-please.blogspot.co.il/2016/05/qsee-privilege-escalation-vulnerability.html
http://bits-please.blogspot.com/

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Qualcomm QSEE

There are some interesting developments in Qualcomm’s Secure Execution Environment (QSEE).

http://bits-please.blogspot.co.il/2016/05/war-of-worlds-hijacking-linux-kernel.html
http://bits-please.blogspot.com/2016/05/qsee-privilege-escalation-vulnerability.html

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