Use-After-Free in ALSA PCM Playback Kernel Module (CVE-2017-8246)

Release Date:

May 1, 2017

Affected Projects:

Android for MSMFirefox OS for MSMQRD Android

Advisory ID:

QCIR-2017-00036-1

CVE ID(s):

CVE-2017-8246

Summary:

The following security vulnerabilities have been identified: CVE-2017-8246 In function msm_pcm_playback_close(), prtd is assigned substream->runtime->private_data. Later, prtd is freed. However, prtd is not sanitized and set to NULL, resulting in a dangling pointer. There are other functions that access the same memory (substream->runtime->private_data) with a NULL check, such as msm_pcm_volume_ctl_put(), which means this freed memory could be used. Access Vector: Local Security Risk: Medium Vulnerability: CWE-416 Use After Free Affected Versions: All Android releases from CAF using the Linux kernel.

Access Vector: Local

Security Risk: Medium

Access Vector: Local

Affected Versions:

All Android releases from CAF using the Linux kernel.

Patch:

CVE-2017-8246:

• https://source.codeaurora.org/quic/la//kernel/msm-3.10/commit/?id=578eb74435eccdc3df516fd744941a7d872fac6c
• https://source.codeaurora.org/quic/la//kernel/msm-3.18/commit/?id=30baaec8afb05abf9f794c631ad944838d498ab8
• https://source.codeaurora.org/quic/la//kernel/msm-4.4/commit/?id=9734b72ae21eca557540c3c42d356dd131a20004

Acknowledgement:

Qualcomm Innovation Center, Inc. (QuIC) thanks Seven Shen from the Trend Micro Mobile Threat Research Team for bringing this issue to QuIC’s attention.

Revisions:

Initial revision

Contact: