SB2015082609 - Use-after free in openssh (Alpine package)
Published: August 26, 2015
Security Bulletin ID
SB2015082609
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Code execution
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Use-after free (CVE-ID: CVE-2015-6564)
CWE-ID: CWE-416 - Use After Free
CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:A/U:Clear
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a use after free error within the mm_answer_pam_free_ctx() function in monitor.c in sshd daemon on non-OpenBSD platforms. A local unprivileged user can send an unexpected early MONITOR_REQ_PAM_FREE_CTX request and gain root privileges on the system.
Remediation
Install update from vendor's website.
References
- https://git.alpinelinux.org/aports/commit/?id=8a07923212fef85b959a7a5d33641b887bb28926
- https://git.alpinelinux.org/aports/commit/?id=9f54596949dd38f889aab1798292ffe1c3bc7ed3
- https://git.alpinelinux.org/aports/commit/?id=397b30fdd336abf6492edc4c261e51445808a133
- https://git.alpinelinux.org/aports/commit/?id=d17bb4a5103becdf779de640c3274345395bb8b9