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CVE-2016-1908

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 201612-18
Posted Dec 7, 2016
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201612-18 - Multiple vulnerabilities have been found in OpenSSH, the worst of which allows remote attackers to cause Denial of Service. Versions less than 7.3_p1-r7 are affected.

tags | advisory, remote, denial of service, vulnerability
systems | linux, gentoo
advisories | CVE-2015-8325, CVE-2016-1908, CVE-2016-3115, CVE-2016-6210, CVE-2016-8858
SHA-256 | cc124780a02d52103b56c764eff6ad2156bc5a56b638ae35230124f1be579026
Red Hat Security Advisory 2016-0741-01
Posted May 11, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0741-01 - OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server. Security Fix: It was found that the OpenSSH client did not properly enforce the ForwardX11Timeout setting. A malicious or compromised remote X application could possibly use this flaw to establish a trusted connection to the local X server, even if only untrusted X11 forwarding was requested.

tags | advisory, remote, local, protocol
systems | linux, redhat, unix
advisories | CVE-2015-5352, CVE-2015-6563, CVE-2015-6564, CVE-2016-1908
SHA-256 | 00e52addfae71f7599c46f84945f6728921c76a58d7ccf320ceccef95da62c08
Ubuntu Security Notice USN-2966-1
Posted May 9, 2016
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2966-1 - Shayan Sadigh discovered that OpenSSH incorrectly handled environment files when the UseLogin feature is enabled. A local attacker could use this issue to gain privileges. Ben Hawkes discovered that OpenSSH incorrectly handled certain network traffic. A remote attacker could possibly use this issue to cause OpenSSH to crash, resulting in a denial of service. This issue only applied to Ubuntu 15.10. Various other issues were also addressed.

tags | advisory, remote, denial of service, local
systems | linux, ubuntu
advisories | CVE-2015-8325, CVE-2016-1907, CVE-2016-1908, CVE-2016-3115
SHA-256 | 8d08319b81c2a6de2568e6524b5d6c6312219c6acc3da869743e1e123b16ebd5
Red Hat Security Advisory 2016-0465-01
Posted Mar 22, 2016
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2016-0465-01 - OpenSSH is OpenBSD's SSH protocol implementation. These packages include the core files necessary for both the OpenSSH client and server. It was discovered that the OpenSSH server did not sanitize data received in requests to enable X11 forwarding. An authenticated client with restricted SSH access could possibly use this flaw to bypass intended restrictions. An access flaw was discovered in OpenSSH; the OpenSSH client did not correctly handle failures to generate authentication cookies for untrusted X11 forwarding. A malicious or compromised remote X application could possibly use this flaw to establish a trusted connection to the local X server, even if only untrusted X11 forwarding was requested.

tags | advisory, remote, local, protocol
systems | linux, redhat, openbsd
advisories | CVE-2016-1908, CVE-2016-3115
SHA-256 | ec747fbcdba74a44a4ea458f9664256110da65f71f30774569e157e19509d8de
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