PT-2016-3110 · Openbsd+6 · Openssh+6

Thomas Hoger · Published 2016-01-15 · Updated 2025-11-30 · CVE-2016-1908

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions OpenSSH versions prior to 7.2

Description The issue is related to errors in security settings of the OpenSSH client, specifically with the handling of failed cookie generation for untrusted X11 forwarding. This allows a remote attacker to obtain trusted X11 forwarding privileges by leveraging configuration issues on the local X11 server, such as the lack of the SECURITY extension. The attacker can trigger a fallback and gain access to the target local X server.

Recommendations For OpenSSH versions prior to 7.2, update to version 7.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the X11 server or disabling untrusted X11 forwarding until a patch is available.

Fix

Improper Authentication

Weakness Enumeration

CWE-287

CWE-254

Related Identifiers

ALT-PU-2016-1200

ALT-PU-2024-3921

ALT-PU-2024-4077

ALT-PU-2024-4467

ALT-PU-2024-9513

BDU:2017-01263

CESA-2016_0465

CESA-2016_0741

CVE-2016-1908

DLA-1500-1

DLA-1500-2

RHSA-2016:0465

RHSA-2016:0741

RHSA-2016_0465

RHSA-2016_0741

SUSE-SU-2016:1386-1

SUSE-SU-2016:1528-1

SUSE-SU-2016:2388-1

SUSE-SU-2016:2555-1

USN-2966-1

Affected Products

Alt Linux

Centos

Ibm Aix

Openssh

Red Hat

Suse

Ubuntu

References · 62

• https://anongit.mindrot.org/openssh.git/commit/?id=ed4ce82dbfa8a3a3c8ea6fa0db113c71e234416c · Patch
• https://security-tracker.debian.org/tracker/CVE-2016-1908 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2016-1908 · Vendor Advisory
• http://openssh.com/txt/release-7.2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-1907 · Vendor Advisory
• https://ubuntu.com/security/CVE-2015-8325 · Vendor Advisory
• https://bdu.fstec.ru/vul/2017-01263 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=1298741 · Patch
• https://ubuntu.com/security/CVE-2016-3115 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2016:1528-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2016-1908 · Security Note
• https://osv.dev/vulnerability/DLA-1500-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2016-1908 · Security Note
• https://osv.dev/vulnerability/DLA-1500-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2016-1908 · Vendor Advisory