CVE-2018-20685

Publication date 10 January 2019

Last updated 11 February 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.3 · Medium

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
openssh 24.10 oracular
Fixed 1:7.9p1-5
24.04 LTS noble
Fixed 1:7.9p1-5
23.10 mantic
Fixed 1:7.9p1-5
23.04 lunar
Fixed 1:7.9p1-5
22.10 kinetic
Fixed 1:7.9p1-5
22.04 LTS jammy
Fixed 1:7.9p1-5
21.10 impish
Fixed 1:7.9p1-5
21.04 hirsute
Fixed 1:7.9p1-5
20.10 groovy
Fixed 1:7.9p1-5
20.04 LTS focal
Fixed 1:7.9p1-5
19.10 eoan
Fixed 1:7.9p1-5
19.04 disco
Fixed 1:7.9p1-5
18.10 cosmic
Fixed 1:7.7p1-4ubuntu0.2
18.04 LTS bionic
Fixed 1:7.6p1-4ubuntu0.2
16.04 LTS xenial
Fixed 1:7.2p2-4ubuntu2.7
14.04 LTS trusty
Fixed 1:6.6p1-2ubuntu2.12
openssh-ssh1 24.10 oracular Ignored
24.04 LTS noble Ignored
23.10 mantic Ignored end of life, was needs-triage
23.04 lunar Ignored end of life, was needs-triage
22.10 kinetic Ignored end of life, was needs-triage
22.04 LTS jammy Ignored
21.10 impish Ignored end of life
21.04 hirsute Ignored end of life
20.10 groovy Ignored end of life
20.04 LTS focal Ignored
19.10 eoan Ignored end of life
19.04 disco Ignored end of life
18.10 cosmic Ignored end of life
18.04 LTS bionic Ignored
16.04 LTS xenial Not in release
14.04 LTS trusty Not in release

Notes

mdeslaur

openssh-ssh1 is only provided for compatibility with old devices that cannot be upgraded to modern protocols. We will not be providing any security support for the openssh-ssh1 package as it is insecure and should be used in trusted environments only. The recommended workaround for this issue is to switch to using sftp instead of scp.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
openssh

Severity score breakdown

Parameter Value
Base score 5.3 · Medium
Attack vector Network
Attack complexity High
Privileges required None
User interaction Required
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N