[USN-6585-1] libssh2 vulnerability

[Marc Deslauriers]

==========================================================================
Ubuntu Security Notice USN-6585-1
January 15, 2024

libssh2 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.10

Summary:

libssh2 could be made to expose sensitive information over the network.

Software Description:
- libssh2: Client-side C library implementing the SSH2 protocol

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.

Update instructions:

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

Ubuntu 23.10:
   libssh2-1                       1.11.0-2ubuntu0.1

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

References:
   https://ubuntu.com/security/notices/USN-6585-1
   CVE-2023-48795

Package Information:
   https://launchpad.net/ubuntu/+source/libssh2/1.11.0-2ubuntu0.1

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