Date: Tue, 15 Oct 2013 18:44:58 +0100 From: Jonathan Salwan <jonathan.salwan@...il.com> To: oss-security@...ts.openwall.com Subject: Report - Stack-based buffer overflow and memory disclosure in camera driver (CVE-2013-4748 CVE-2013-4739) Source: https://www.codeaurora.org/projects/security-advisories/stack-based-buffer-overflow-and-memory-disclosure-camera-driver-cve-2013-4748-cve-2013-4739 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 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. Revisions Initial revision Contact security-advisory@...cinc.com -- Jonathan
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