USN-6560-2

Advisory lineage Upstream: 4 Downstream: 0
Published: 11 Jan 2024, 16:53
Last modified:20 May 2026, 16:03

Vulnerability Summary

Overall Risk (default)
minimal
0/100
CVSS Score
No data
EPSS Score
No data
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

11 Jan 2024, 16:53
Published
Vulnerability first disclosed
20 May 2026, 16:03
Last Modified
Vulnerability information updated

Description

openssh vulnerabilities USN-6560-1 fixed several vulnerabilities in OpenSSH. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: Fabian Bäumer, Marcus Brinkmann, Jörg Schwenk discovered that the SSH protocol was vulnerable to a prefix truncation attack. If a remote attacker was able to intercept SSH communications, extension negotiation messages could be truncated, possibly leading to certain algorithms and features being downgraded. This issue is known as the Terrapin attack. This update adds protocol extensions to mitigate this issue. (CVE-2023-48795) It was discovered that OpenSSH incorrectly handled user names or host names with shell metacharacters. An attacker could possibly use this issue to perform OS command injection. This only affected Ubuntu 18.04 LTS. (CVE-2023-51385)

Affected Systems

  • ubuntu•openssh

    < 1:7.2p2-4ubuntu2.10+esm5 | < 1:7.6p1-4ubuntu0.7+esm3

References (3)