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CVE-2013-4548

Status Candidate

Overview

The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.

Related Files

HP Security Bulletin HPSBUX03188 SSRT101487 1
Posted Nov 12, 2014
Authored by HP | Site hp.com

HP Security Bulletin HPSBUX03188 SSRT101487 1 - Potential security vulnerabilities have been identified with HP-UX running HP Secure Shell. These vulnerabilities could be exploited remotely to create a Denial of Service (DoS) and other vulnerabilities. Revision 1 of this advisory.

tags | advisory, denial of service, shell, vulnerability
systems | hpux
advisories | CVE-2013-4548, CVE-2014-1692, CVE-2014-2532, CVE-2014-2653
SHA-256 | f48ab840d0de653a028d42f01133ffad6f77ec827e8549cb98d0a31ab37fa27c
FreeBSD Security Advisory - OpenSSH AES-GCM Memory Corruption
Posted Nov 19, 2013
Site security.freebsd.org

FreeBSD Security Advisory - A memory corruption vulnerability exists in the post-authentication sshd process when an AES-GCM cipher (aes128-gcm@openssh.com or aes256-gcm@openssh.com) is selected during key exchange. If exploited, this vulnerability might permit code execution with the privileges of the authenticated user, thereby allowing a malicious user with valid credentials to bypass shell or command restrictions placed on their account.

tags | advisory, shell, code execution
systems | freebsd
advisories | CVE-2013-4548
SHA-256 | 878536e73df64b2ee9e3165866803aec2f9d6c286c5bb0c627ff2c9aed8e06fe
Slackware Security Advisory - openssh Updates
Posted Nov 19, 2013
Authored by Slackware Security Team | Site slackware.com

Slackware Security Advisory - New openssh packages are available for Slackware 14.1 and -current to fix a security issue. Related CVE Numbers: CVE-2013-4548.

tags | advisory
systems | linux, slackware
advisories | CVE-2013-4548
SHA-256 | 0ec99ec21c4e670141a83c9c5c98eeacd33c86ad07dc08457b0a9ce52e6e078b
Ubuntu Security Notice USN-2014-1
Posted Nov 8, 2013
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2014-1 - Markus Friedl discovered that OpenSSH incorrectly handled memory when the AES-GCM cipher was used. A remote authenticated attacker could use this issue to execute arbitrary code as their user, possibly bypassing shell or command restrictions.

tags | advisory, remote, arbitrary, shell
systems | linux, ubuntu
advisories | CVE-2013-4548
SHA-256 | e189e6627785c00b5dcbe8d47d9b5eb49ddf89426224169d3a73aa26e7a1a493
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