SB2017101042 - Double Free in Google, Google Android

Description

This security bulletin contains information about 1 vulnerability.

1) Double Free (CVE-ID: CVE-2017-9687)

CWE-ID: CWE-415 - Double Free

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local authenticated user to execute arbitrary code.

In Android for MSM, Firefox OS for MSM, QRD Android, with all Android releases from CAF using the Linux kernel, two concurrent threads/processes can write the value of "0" to the debugfs file that controls ipa ipc log which will lead to the double-free in ipc_log_context_destroy(). Another issue is the Use-After-Free which can happen due to the race condition when the ipc log is deallocated via the debugfs call during a log print.

Remediation

Install update from vendor's website.

References

• http://www.securityfocus.com/bid/101160
• https://source.android.com/security/bulletin/pixel/2017-10-01