What’s Vulnerable › Vulnerabilities

CVE-2013-4548

• Severity: medium (CVSS 6.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2013-11-08 · updated 2026-06-16
• Weakness: CWE-264

Description

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 products

• OpenSSH: 6.2, 6.3

References

• http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html
• http://marc.info/?l=bugtraq&m=141576985122836&w=2
• http://openwall.com/lists/oss-security/2013/11/08/3
• http://www.openssh.com/txt/gcmrekey.adv
• http://www.ubuntu.com/usn/USN-2014-1
• http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00017.html
• http://marc.info/?l=bugtraq&m=141576985122836&w=2
• http://openwall.com/lists/oss-security/2013/11/08/3
• http://www.openssh.com/txt/gcmrekey.adv
• http://www.ubuntu.com/usn/USN-2014-1

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