Original description
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.
Affected software
- OpenSSH < 7.2 Fixed in: 7.2 exact match
Details
- Published
- 2017-04-11
- Last modified
- 2026-06-17
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H- CWE
- CWE-287
References
- cve.org/CVE-2016-1908
- nvd.nist.gov/vuln/detail/CVE-2016-1908
- openwall.com/lists/oss-security/2016/01/15/13
- rhn.redhat.com/errata/RHSA-2016-0465.html
- rhn.redhat.com/errata/RHSA-2016-0741.html
- www.openssh.com/txt/release-7.2
- www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- www.securityfocus.com/bid/84427
- www.securitytracker.com/id/1034705
- anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c
- bugzilla.redhat.com/show_bug.cgi?id=1298741
- cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
- lists.debian.org/debian-lts-announce/2018/09/msg00010.html
- security.gentoo.org/glsa/201612-18
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