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CVE-2016-10012

Published: 4 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.

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."

Priority

Low

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
artful Not vulnerable
(1:7.4p1-1)
bionic Not vulnerable
(1:7.4p1-1)
cosmic Not vulnerable
(1:7.4p1-1)
disco Not vulnerable
(1:7.4p1-1)
eoan Not vulnerable
(1:7.4p1-1)
focal Not vulnerable
(1:7.4p1-1)
groovy Not vulnerable
(1:7.4p1-1)
hirsute Not vulnerable
(1:7.4p1-1)
precise Ignored
(end of life)
trusty
Released (1:6.6p1-2ubuntu2.10)
upstream
Released (1:7.4p1-1)
xenial
Released (1:7.2p2-4ubuntu2.4)
yakkety Ignored
(end of life)
zesty Not vulnerable
(1:7.4p1-1)
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

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H