Overflow and memory disclosure in Android’s camera driver (CVE-2013-4738 CVE-2013-4739)
A stack-based buffer overflow and a kernel memory disclosure vulnerability have been discovered in the system call handlers of the camera driver.Description
A stack-based buffer overflow and a kernel memory disclosure vulnerability have been discovered in the system call handlers of the camera driver.
CVE-2013-4738
The camera post processing engine (CPP) and video processing engine (VPE) provide an ioctl system call interface to user space clients for communication. When processing arguments passed to the VIDIOC_MSM_CPP_DEQUEUE_STREAM_BUFF_INFO or VIDIOC_MSM_VPE_DEQUEUE_STREAM_BUFF_INFO ioctl subdev handlers, a user space supplied length value is used to copy memory to a local stack buffer without proper bounds checking. An application with access to the respective device nodes can use this flaw to, e.g., elevate privileges. Access Vector: local Security Risk: high Vulnerability: CWE-121 (stack-based buffer overflow)
CVE-2013-4739 The Gemini JPEG encoder and the Jpeg1.0 common encoder/decoder engines of the camera driver are not properly initializing all members of a structure before copying it to user space. This allows a local attacker to obtain potentially sensitive information from kernel stack memory via ioctl system calls. Access Vector: local Security Risk: low Vulnerability: CWE-200 (information exposure)
Affected versions
All Android releases from CAF using a Linux kernel from the following heads:
- msm-3.4 – jb_3*
Patch
We advise customers to apply the following patches: CVE-2013-4738:
- https://www.codeaurora.org/cgit/quic/la/kernel/msm/commit/?id=c9c81836ee44db9974007d34cf2aaeb1a51a8d45
- https://www.codeaurora.org/cgit/quic/la/kernel/msm/commit/?id=28385b9c3054c91dca1aa194ffa750550c50f3ce
- https://www.codeaurora.org/cgit/quic/la/kernel/msm/commit/?id=8604847927f952cc8e773b97eca24e1060a570f2
Credits
Reported by our researcher Jonathan Salwan and patched by Qualcomm Innovation Center.
More information on https://www.codeaurora.org/projects/security-advisories/stack-based-buffer-overflow-and-memory-disclosure-camera-driver-cve-2013-4738-cve-2013-4739