Vulnerabilities
Misconfiguration
Compliance
CVE Vulnerabilities

CVE-2016-1908

Improper Authentication

Published: Apr 11, 2017 | Modified: Apr 20, 2025
CVSS 3.x
9.8
CRITICAL
Source:
NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 2.x
7.5 HIGH
AV:N/AC:L/Au:N/C:P/I:P/A:P
RedHat/V2
4.9 MODERATE
AV:N/AC:M/Au:S/C:P/I:P/A:N
RedHat/V3
Ubuntu
LOW
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2016-1908
CWEhttps://cwe.mitre.org/data/definitions/287.html

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.

Weakness

When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.

Affected Software

NameVendorStart VersionEnd Version
OpensshOpenbsd*7.2 (excluding)
Red Hat Enterprise Linux 6RedHatopenssh-0:5.3p1-117.el6*
Red Hat Enterprise Linux 7RedHatopenssh-0:6.6.1p1-25.el7_2*
OpensshUbuntuesm-infra-legacy/trusty*
OpensshUbuntuprecise*
OpensshUbuntutrusty*
OpensshUbuntutrusty/esm*
OpensshUbuntuupstream*
OpensshUbuntuvivid*
OpensshUbuntuvivid/stable-phone-overlay*
OpensshUbuntuvivid/ubuntu-core*
OpensshUbuntuwily*

Potential Mitigations

References

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