CVE-2019-6111

Published: 14 January 2019

An issue was discovered in OpenSSH 7.9. Due to the scp implementation being derived from 1983 rcp, the server chooses which files/directories are sent to the client. However, the scp client only performs cursory validation of the object name returned (only directory traversal attacks are prevented). A malicious scp server (or Man-in-The-Middle attacker) can overwrite arbitrary files in the scp client target directory. If recursive operation (-r) is performed, the server can manipulate subdirectories as well (for example, to overwrite the .ssh/authorized_keys file).

Priority

Low

CVSS 3 base score: 5.9

Status

Package Release Status
openssh
Launchpad, Ubuntu, Debian
Upstream Needs triage

Ubuntu 21.04 (Hirsute Hippo) Not vulnerable
(1:7.9p1-10)
Ubuntu 20.10 (Groovy Gorilla) Not vulnerable
(1:7.9p1-10)
Ubuntu 20.04 LTS (Focal Fossa) Not vulnerable
(1:7.9p1-10)
Ubuntu 18.04 LTS (Bionic Beaver)
Released (1:7.6p1-4ubuntu0.3)
Ubuntu 16.04 ESM (Xenial Xerus)
Released (1:7.2p2-4ubuntu2.8)
Ubuntu 14.04 ESM (Trusty Tahr)
Released (1:6.6p1-2ubuntu2.13)
Patches:
Upstream: https://github.com/openssh/openssh-portable/commit/391ffc4b9d31fa1f4ad566499fef9176ff8a07dc
Upstream: https://github.com/openssh/openssh-portable/commit/3d896c157c722bc47adca51a58dca859225b5874
openssh-ssh1
Launchpad, Ubuntu, Debian
Upstream Ignored
(frozen on openssh 7.5p)
Ubuntu 21.04 (Hirsute Hippo) Needs triage

Ubuntu 20.10 (Groovy Gorilla) Needs triage

Ubuntu 20.04 LTS (Focal Fossa) Needs triage

Ubuntu 18.04 LTS (Bionic Beaver) Needs triage

Ubuntu 16.04 ESM (Xenial Xerus) Does not exist

Ubuntu 14.04 ESM (Trusty Tahr) Does not exist

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.

The updates in USN-3885-1 inverted two CVE numbers by accident.

The initial USN was incomplete and did not include the second
commit.

References