1. Ubuntu Security Notices
  2. USN-6138-1

USN-6138-1: libssh vulnerabilities

Publication date

5 June 2023

Overview

Several security issues were fixed in libssh.

Releases

Packages

  • libssh - A tiny C SSH library

Details

Philip Turnbull discovered that libssh incorrectly handled rekeying with
algorithm guessing. A remote attacker could use this issue to cause libssh
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2023-1667)

Kevin Backhouse discovered that libssh incorrectly handled verifying data
signatures. A remote attacker could possibly use this issue to bypass
authorization. (CVE-2023-2283)

Philip Turnbull discovered that libssh incorrectly handled rekeying with
algorithm guessing. A remote attacker could use this issue to cause libssh
to crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2023-1667)

Kevin Backhouse discovered that libssh incorrectly handled verifying data
signatures. A remote attacker could possibly use this issue to bypass
authorization. (CVE-2023-2283)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
23.04 lunar libssh-4 –  0.10.4-2ubuntu0.1
22.10 kinetic libssh-4 –  0.9.6-2ubuntu0.22.10.1
22.04 jammy libssh-4 –  0.9.6-2ubuntu0.22.04.1
20.04 focal libssh-4 –  0.9.3-2ubuntu2.3

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References

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