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CVE-2016-1908

9.8 · CRITICAL

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…

Published Apr 11, 2017CWE-287EPSS 13.74%

Overview

CVE-2016-1908 is a critical-severity vulnerability. It was published on April 11, 2017 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refopenwall.com/lists/oss-security/2016/01/15/13Refrhn.redhat.com/errata/RHSA-2016-0465.htmlRefrhn.redhat.com/errata/RHSA-2016-0741.htmlRefwww.openssh.com/txt/release-7.2Refwww.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlRefwww.securityfocus.com/bid/84427Refwww.securitytracker.com/id/1034705Refanongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416cRefbugzilla.redhat.com/show_bug.cgi?id=1298741Refcert-portal.siemens.com/productcert/pdf/ssa-412672.pdf

How CyberStrike helps

Frequently asked questions

What is CVE-2016-1908?

CVE-2016-1908 is a critical-severity vulnerability. It was published on April 11, 2017 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2016-1908?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2016-1908?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2016-1908?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2016-1908 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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