CVE-2015-6563
MEDIUM severity · CVSS 6.4 · Improper input validation
6.4CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorLocal
Attack complexityHigh
Privileges requiredHigh
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)0%
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://www.openssh.com/txt/release-7.0Advisory
- http://lists.apple.com/archives/security-announce/2015/Oct/msg00005.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
- http://rhn.redhat.com/errata/RHSA-2016-0741.html
- http://seclists.org/fulldisclosure/2015/Aug/54
- http://www.openwall.com/lists/oss-security/2015/08/22/1
- http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html