Improper input validation in MDP driver when processing color maps (CVE-2014-4323)

Release Date:

December 11, 2014

Affected Projects:

Android for MSMFirefox OS for MSMQRD Android

Advisory ID:

QCIR-2014-00007-1

CVE ID(s):

CVE-2014-4323

Summary:

The following security vulnerability has been identified in the implementation of the MDP display driver for Android: CVE-2014-4323: The MDP display driver provides an ioctl system call interface to user space clients for communication. When processing this communication, the mdp_lut_hw_update function uses the user-supplied values start and len from an fb_cmap structure for write operations without any boundary checks. A local application with graphics privileges can access the MDP display device node and use this to, e.g., elevate privileges.

Access Vector: Local

Security Risk: High

Access Vector: Local

Affected Versions:

All active branches of the MSM kernel for Android on CAF are affected. The driver itself is only used on the following chipsets: 8064/8960/8660/8x30/7x30.

Patch:

We advise customers to apply the following patches:

• https://www.codeaurora.org/cgit/quic/la//kernel/msm-3.10/commit/?id=014fa8def84c62893fa016e873c12de1da498603

Acknowledgement:

Qualcomm Innovation Center, Inc. (QuIC) thanks Gal Beniamini for reporting the related issues and working with QuIC to help improve Android device security.

Revisions:

Initial revision

Contact:

security-advisory@quicinc.com