CVE-2016-1908

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.

• CWE-287
• CWE-287

• http://openwall.com/lists/oss-security/2016/01/15/13Mailing List, Third Party Advisory
• http://rhn.redhat.com/errata/RHSA-2016-0465.htmlThird Party Advisory
• http://rhn.redhat.com/errata/RHSA-2016-0741.htmlThird Party Advisory
• http://www.openssh.com/txt/release-7.2Release Notes, Vendor Advisory
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
• http://www.securityfocus.com/bid/84427Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1034705Broken Link, Third Party Advisory, VDB Entry
• https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416cPatch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1298741Issue Tracking, Patch, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
• https://lists.debian.org/debian-lts-announce/2018/09/msg00010.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201612-18Third Party Advisory
• http://openwall.com/lists/oss-security/2016/01/15/13Mailing List, Third Party Advisory
• http://rhn.redhat.com/errata/RHSA-2016-0465.htmlThird Party Advisory
• http://rhn.redhat.com/errata/RHSA-2016-0741.htmlThird Party Advisory
• http://www.openssh.com/txt/release-7.2Release Notes, Vendor Advisory
• http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlThird Party Advisory
• http://www.securityfocus.com/bid/84427Third Party Advisory, VDB Entry
• http://www.securitytracker.com/id/1034705Broken Link, Third Party Advisory, VDB Entry
• https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416cPatch, Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=1298741Issue Tracking, Patch, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
• https://lists.debian.org/debian-lts-announce/2018/09/msg00010.htmlMailing List, Third Party Advisory
• https://security.gentoo.org/glsa/201612-18Third Party Advisory

Published

Apr 11, 2017

Last Modified

Jun 17, 2026

Status

Modified