CVE-2016-1908

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.

Category

9.8
CVSS
Severity: Critical
CVSS 3.1 •
CVSS 2.0 •
EPSS 2.18% Top 20%
Vendor Advisory redhat.com Vendor Advisory gentoo.org Vendor Advisory redhat.com Vendor Advisory openssh.com
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
http://www.openssh.com/txt/release-7.2 release notes vendor advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html third party advisory
https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c third party advisory patch
http://openwall.com/lists/oss-security/2016/01/15/13 third party advisory mailing list
http://www.securitytracker.com/id/1034705 vdb entry third party advisory broken link
http://rhn.redhat.com/errata/RHSA-2016-0741.html third party advisory vendor advisory
https://security.gentoo.org/glsa/201612-18 third party advisory vendor advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1298741 issue tracking third party advisory patch
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html third party advisory mailing list
http://www.securityfocus.com/bid/84427 vdb entry third party advisory
http://rhn.redhat.com/errata/RHSA-2016-0465.html third party advisory vendor advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

Frequently Asked Questions

What is the severity of CVE-2016-1908?
CVE-2016-1908 has been scored as a critical severity vulnerability.
How to fix CVE-2016-1908?
To fix CVE-2016-1908, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-1908 being actively exploited in the wild?
It is possible that CVE-2016-1908 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~2% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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