CVE-2016-1908
CRITICAL severity · CVSS 9.8 · Improper authentication
9.8CVSS CRITICAL
Summary
The client in OpenSSH before 7.2 mishandles failed cookie generation for untrusted X11 forwarding and relies on the local X11 server for access-control decisions, which allows remote X11 clients to trigger a fallback and obtain trusted X11 forwarding privileges by leveraging configuration issues on this X11 server, as demonstrated by lack of the SECURITY extension on this X11 server.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactHigh
Availability impactHigh
Exploit probability (EPSS)14%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c ↗
Additional information
- NVD record
- https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416cPatch
- http://www.openssh.com/txt/release-7.2Advisory
- http://openwall.com/lists/oss-security/2016/01/15/13Advisory
- http://rhn.redhat.com/errata/RHSA-2016-0465.htmlAdvisory
- http://rhn.redhat.com/errata/RHSA-2016-0741.htmlAdvisory
- http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlAdvisory
- http://www.securityfocus.com/bid/84427Advisory
- http://www.securitytracker.com/id/1034705Advisory