HIGH
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.
http://www.openwall.com/lists/oss-security/2016/12/19/2
http://www.securityfocus.com/bid/94975
http://www.securitytracker.com/id/1037490
http://www.slackware.com/security/viewer.php?l=slackware-security&y=2016&m=slackware-security.647637
https://access.redhat.com/errata/RHSA-2017:2029
https://github.com/openbsd/src/commit/3095060f479b86288e31c79ecbc5131a66bcd2f9
https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
https://security.netapp.com/advisory/ntap-20171130-0002/
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03818en_us
Source: MITRE
Published: 2017-01-05
Updated: 2018-09-11
Type: CWE-119
Base Score: 7.2
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C
Impact Score: 10
Exploitability Score: 3.9
Severity: HIGH
Base Score: 7.8
Vector: CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Impact Score: 5.9
Exploitability Score: 1.8
Severity: HIGH