PublicDateAtUSN: 2017-01-04
Candidate: CVE-2016-10012
PublicDate: 2017-01-05 02:59:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-10012
 https://www.openssh.com/txt/release-7.4
 http://www.openwall.com/lists/oss-security/2016/12/19/2
 https://ubuntu.com/security/notices/USN-3538-1
Description:
 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.
Ubuntu-Description:
Notes:
 ratliff> Mitigating circumstances noted in the release notes:
 ratliff> This could potentially allow attacks against the
 ratliff> privileged monitor process from the sandboxed privilege-separation
 ratliff> process (a compromise of the latter would be required first).
 ratliff> also "pre-auth compression has been disabled by default in 
 ratliff> sshd for >10 years."
Bugs:
 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=848717
Priority: low
Discovered-by: Guido Vranken
Assigned-to: mdeslaur
CVSS:
 nvd: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H [7.8 HIGH]

Patches_openssh:
 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
upstream_openssh: released (1:7.4p1-1)
precise_openssh: ignored (reached end-of-life)
precise/esm_openssh: ignored (end of ESM support, was needed)
trusty_openssh: released (1:6.6p1-2ubuntu2.10)
trusty/esm_openssh: released (1:6.6p1-2ubuntu2.10)
vivid/stable-phone-overlay_openssh: ignored (reached end-of-life)
vivid/ubuntu-core_openssh: ignored (reached end-of-life)
xenial_openssh: released (1:7.2p2-4ubuntu2.4)
esm-infra/xenial_openssh: released (1:7.2p2-4ubuntu2.4)
yakkety_openssh: ignored (reached end-of-life)
zesty_openssh: not-affected (1:7.4p1-1)
artful_openssh: not-affected (1:7.4p1-1)
bionic_openssh: not-affected (1:7.4p1-1)
cosmic_openssh: not-affected (1:7.4p1-1)
disco_openssh: not-affected (1:7.4p1-1)
eoan_openssh: not-affected (1:7.4p1-1)
focal_openssh: not-affected (1:7.4p1-1)
groovy_openssh: not-affected (1:7.4p1-1)
hirsute_openssh: not-affected (1:7.4p1-1)
devel_openssh: not-affected (1:7.4p1-1)