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CVE-2018-20685

Published: 10 January 2019

In OpenSSH 7.9, scp.c in the scp client allows remote SSH servers to bypass intended access restrictions via the filename of . or an empty filename. The impact is modifying the permissions of the target directory on the client side.

Notes

AuthorNote
seth-arnold
openssh-ssh1 is provided for compatibility with old devices that
cannot be upgraded to modern protocols. Thus we may not provide security
support for this package if doing so would prevent access to equipment.
mdeslaur
The recommended workaround for this issue is to switch to using
sftp instead of scp.
Priority

Medium

CVSS 3 base score: 5.3

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
bionic
Released (1:7.6p1-4ubuntu0.2)
cosmic
Released (1:7.7p1-4ubuntu0.2)
disco
Released (1:7.9p1-5)
eoan
Released (1:7.9p1-5)
focal
Released (1:7.9p1-5)
groovy
Released (1:7.9p1-5)
hirsute
Released (1:7.9p1-5)
impish
Released (1:7.9p1-5)
jammy
Released (1:7.9p1-5)
kinetic
Released (1:7.9p1-5)
precise Ignored
(end of ESM support, was needed)
trusty
Released (1:6.6p1-2ubuntu2.12)
upstream
Released (1:7.9p1-5)
xenial
Released (1:7.2p2-4ubuntu2.7)
Patches:
upstream: https://github.com/openssh/openssh-portable/commit/6010c0303a422a9c5fa8860c061bf7105eb7f8b2
upstream: https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/usr.bin/ssh/scp.c.diff?r1=1.197&r2=1.198&f=h
openssh-ssh1
Launchpad, Ubuntu, Debian
bionic Needs triage

cosmic Ignored
(reached end-of-life)
disco Ignored
(reached end-of-life)
eoan Ignored
(reached end-of-life)
focal Needs triage

groovy Ignored
(reached end-of-life)
hirsute Ignored
(reached end-of-life)
impish Ignored
(reached end-of-life)
jammy Needs triage

kinetic Needs triage

precise Does not exist

trusty Does not exist

upstream Ignored
(frozen on openssh 7.5p)
xenial Does not exist