Permissions, Privileges, and Access Controls in OpenSSH - CVE-2013-4548

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Main Vulnerability Database Vulnerabilities #VU33304

Permissions, Privileges, and Access Controls in OpenSSH - CVE-2013-4548

Published: November 8, 2013 / Updated: August 3, 2020


Vulnerability identifier: #VU33304
CSH Severity: Low
CVSS v4: 5.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2013-4548
CWE-ID: CWE-264
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote #AU# to read and manipulate data.

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.


Affected software

OpenSSH
openssh (Alpine package)
Slackware Linux

How to mitigate CVE-2013-4548

Install update from vendor's website.

OpenSSH - update to 6.2p1
openssh (Alpine package) - update to 6.2_p2-r1

External References

Related Security Bulletins