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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
bionic
Released (1:7.6p1-4ubuntu0.3)
cosmic
Released (1:7.7p1-4ubuntu0.3)
disco Not vulnerable
(1:7.9p1-10)
eoan Not vulnerable
(1:7.9p1-10)
focal Not vulnerable
(1:7.9p1-10)
groovy Not vulnerable
(1:7.9p1-10)
hirsute Not vulnerable
(1:7.9p1-10)
impish Not vulnerable
(1:7.9p1-10)
jammy Not vulnerable
(1:7.9p1-10)
precise Ignored
(end of ESM support, was needed)
trusty
Released (1:6.6p1-2ubuntu2.13)
upstream Needs triage

xenial
Released (1:7.2p2-4ubuntu2.8)
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 Needs triage

jammy Needs triage

precise Does not exist

trusty Does not exist

upstream Ignored
(frozen on openssh 7.5p)
xenial 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

Bugs