CVE-2013-4548

NameCVE-2013-4548
DescriptionThe 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.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium (attack range: remote)
Debian Bugs729029

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssh (PTS)wheezy1:6.0p1-4+deb7u4fixed
wheezy (security)1:6.0p1-4+deb7u6fixed
jessie (security), jessie1:6.7p1-5+deb8u3fixed
stretch1:7.3p1-3fixed
sid1:7.3p1-5fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
opensshsource(unstable)1:6.4p1-1medium729029
opensshsourcesqueeze(not affected)
opensshsourcewheezy(not affected)

Notes

[wheezy] - openssh <not-affected> (AES-GCM support introduced in 6.2)
[squeeze] - openssh <not-affected> (AES-GCM support introduced in 6.2)

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