DescriptionThe shared memory manager (associated with pre-authentication compression) in sshd in OpenSSH before 7.4 does not ensure that a bounds check is enforced by all compilers, which might allows local users to gain privileges by leveraging access to a sandboxed privilege-separation process, related to the m_zback and m_zlib data structures.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
NVD severityhigh (attack range: local)
Debian Bugs848717

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
openssh (PTS)wheezy1:6.0p1-4+deb7u4vulnerable
wheezy (security)1:6.0p1-4+deb7u6vulnerable
jessie (security), jessie1:6.7p1-5+deb8u3vulnerable
buster, sid1:7.6p1-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs


[jessie] - openssh <no-dsa> (Minor issue)
[wheezy] - openssh <no-dsa> (Minor issue)
Fixed in upstream 7.4:

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