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AUSCERT External Security Bulletin Redistribution
USN-5053-1: libssh vulnerability
27 August 2021
AusCERT Security Bulletin Summary
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
CVE Names: CVE-2021-3634
Comment: This advisory references vulnerabilities in products which run on
platforms other than Ubuntu. It is recommended that administrators
running libssh check for an updated version of the software for
their operating system.
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USN-5053-1: libssh vulnerability
26 August 2021
libssh could be made to crash or run programs if it received specially
crafted network traffic.
o Ubuntu 21.04
o Ubuntu 20.04 LTS
o libssh - A tiny C SSH library
It was discovered that libssh incorrectly handled rekeying. A remote
attacker could use this issue to cause libssh to crash, resulting in a
denial of service, or possibly execute arbitrary code.
The problem can be corrected by updating your system to the following package
o libssh-4 - 0.9.5-1ubuntu0.1
o libssh-4 - 0.9.3-2ubuntu2.2
In general, a standard system update will make all the necessary changes.
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