CVE-2016-10012

Published: 04 January 2017

The 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.

Priority

Low

CVSS 3 base score: 7.8

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
Upstream
Released (1:7.4p1-1)
Ubuntu 20.10 (Groovy Gorilla) Not vulnerable
(1:7.4p1-1)
Ubuntu 20.04 LTS (Focal Fossa) Not vulnerable
(1:7.4p1-1)
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable
(1:7.4p1-1)
Ubuntu 16.04 LTS (Xenial Xerus)
Released (1:7.2p2-4ubuntu2.4)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (1:6.6p1-2ubuntu2.10)
Patches:
Upstream: https://github.com/openssh/openssh-portable/commit/0082fba4efdd492f765ed4c53f0d0fbd3bdbdf7f
Upstream: https://github.com/openssh/openssh-portable/commit/4577adead6a7d600c8e764619d99477a08192c8f
Upstream: https://github.com/openssh/openssh-portable/commit/b7689155f3f5c4999846c07a852b1c7a43b09cec

Notes

AuthorNote
ratliff
Mitigating circumstances noted in the release notes:
This could potentially allow attacks against the
privileged monitor process from the sandboxed privilege-separation
process (a compromise of the latter would be required first).
also "pre-auth compression has been disabled by default in
sshd for >10 years."

References

Bugs