SB2015082608 - Input validation error in openssh (Alpine package)
Published: August 26, 2015
Security Bulletin ID
SB2015082608
Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Data manipulation
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 security vulnerability.
1) Input validation error (CVE-ID: CVE-2015-6563)
The vulnerability allows a local user to impersonate other users on the system.
The monitor component in sshd in OpenSSH before 7.0 on non-OpenBSD platforms accepts extraneous username data in MONITOR_REQ_PAM_INIT_CTX requests, which allows local users to conduct impersonation attacks by leveraging any SSH login access in conjunction with control of the sshd uid to send a crafted MONITOR_REQ_PWNAM request, related to monitor.c and monitor_wrap.c.
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