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AUSCERT External Security Bulletin Redistribution
ESB-2021.2900
USN-5053-1: libssh vulnerability
27 August 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: libssh
Publisher: Ubuntu
Operating System: Ubuntu
UNIX variants (UNIX, Linux, OSX)
Impact/Access: Execute Arbitrary Code/Commands -- Existing Account
Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3634
Original Bulletin:
https://ubuntu.com/security/notices/USN-5053-1
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.
Releases
o Ubuntu 21.04
o Ubuntu 20.04 LTS
Packages
o libssh - A tiny C SSH library
Details
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.
Update instructions
The problem can be corrected by updating your system to the following package
versions:
Ubuntu 21.04
o libssh-4 - 0.9.5-1ubuntu0.1
Ubuntu 20.04
o libssh-4 - 0.9.3-2ubuntu2.2
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-3634
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