Stack overflow in msm_camera_qup_i2c_write_seq (CVE-2016-6740)

Release Date:

November 29, 2016

Affected Projects:

Android for MSM Firefox OS for MSM QRD Android

Advisory ID:

QCIR-2016-00059-1

CVE ID(s):

CVE-2016-6740

Summary:

The following security vulnerabilities have been identified: CVE-2016-6740> In msm_camera_qup_i2c_write_seq, buf is allocated on the stack. buf's size is client->addr_type + num_byte, where num_byte is user controlled. Thread size limit THREAD_SIZE is set to 0x4000. If num_byte > THREAD_SIZE, buf is larger than stack. When copying to buf (buf[i+len] = data[i];) memory beyond stack can be written.

Access Vector: Local

Security Risk: Medium

Access Vector: Local

Affected Versions:

All Android releases from CAF using the Linux kernel.

Patch:

We advise customers to apply the following patches:

Individual Patches

CVE-2016-6740: https://www.codeaurora.org/gitweb/quic/la/?p=kernel/msm-3.18.git;a=commit;h=a939a87f0adf91feceb329a5c080b86e1ee333c7

Acknowledgement:

This issue was reported to Google by Gengjia Chen (@chengjia4574) and pjf (weibo.com/jfpan) of IceSword Lab, Qihoo 360. Qualcomm Innovation Center, Inc. (QuIC) thanks Google for bringing this issue to QuIC's attention.

Revisions:

Updated revision. Updated acknowledgment section on Dec. 6, 2016.

Contact:

security-advisory@quicinc.com