Android Camera Driver Buffer Overflow / Memory Disclosure

2013.10.22
Risk: High
Local: No
Remote: Yes

*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 CVE-2013-4739: - https://www.codeaurora.org/cgit/quic/la/kernel/msm/commit/?id=8604847927f952cc8e773b97eca24e1060a570f2 *Credits* Reported by the researcher Jonathan Salwan and patched by Qualcomm Innovation Center.

Referencje:

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


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