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Goodix GT915 Driver Memory Corruption / DoS / Privilege Escalation

Goodix GT915 Driver Memory Corruption / DoS / Privilege Escalation
Posted Nov 7, 2013
Authored by Jonathan Salwan

Multiple issues have been identified in the Goodix GT915 touchscreen driver for Android. The issues were found in the write handler of the procfs entry created by the driver, which by default is readable and writeable to users without any specific privileges.

tags | advisory
advisories | CVE-2013-4740, CVE-2013-6122
SHA-256 | 5468cf6bc4a573bce23d6d2362d62f883dc4f5f44ad54aabb748028e15ad7c7f

Goodix GT915 Driver Memory Corruption / DoS / Privilege Escalation

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Description
===========
Multiple issues have been identified in the Goodix gt915 touchscreen
driver for Android. The issues were found in the write handler of the
procfs entry created by the driver, which by default is readable and
writeable to users without any specific privileges.

CVE-2013-4740
-------------
When processing data written to the procfs file, the Goodix gt915
touchscreen driver is using user space supplied content as length
values in subsequent memory manipulation operations without
bounds checking. This can lead to multiple memory corruption issues.
An application with access to the respective file can use this flaw
to, e.g., elevate privileges.

Access Vector: local
Security Risk: high
Vulnerability: CWE-20 (Improper Input Validation)

CVE-2013-6122
-------------
When processing arguments passed to the procfs write handler of
the Goodix gt915 touchscreen driver, user space data is copied to
a global variable and used without a mutual-exclusion mechanism.
The global structure used by the procfs write handler can be accessed
concurrently by more than one process. This would allow local attackers
to bypass the input validation checks (such as introduced by the fix for
CVE-2013-4740). An application with access to the respective file can use
this flaw to, e.g., alter the internal state of the handler, bypass security
checks, or create a denial-of-service condition.

Access Vector: local
Security Risk: medium
Vulnerability: CWE-362 (Concurrent Execution using Shared Resource
with Improper Synchronization)

Affected versions
-----------------
All Android releases from CAF using a Linux kernel from the following heads:

- jb_3*
- msm-3.10

Patch
-----
We advise customers to apply the following patches:
https://www.codeaurora.org/cgit/quic/la/kernel/msm-3.10/commit/?id=f53bcf29a6e7a66b3d935b8d562fa00829261f05

Acknowledgement
===============
Qualcomm Innovation Center, Inc. (QuIC) thanks Jonathan Salwan of the
Sysdream Security Lab for reporting the related issues and working with
QuIC to help improve Android device security.

https://www.codeaurora.org/projects/security-advisories/multiple-memory-corruption-issues-and-race-condition-goodix-gt915-touchscreen-driver-procfs-handler

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