==========================================================================
Ubuntu Security Notice USN-7051-1
October 02, 2024

python-asyncssh vulnerability
==========================================================================

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

- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

A protocol flaw was fixed in AsyncSSH.

Software Description:
- python-asyncssh: asyncio-based client and server implementation of SSHv2 
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 24.04 LTS
   python3-asyncssh                2.10.1-2ubuntu0.1

Ubuntu 22.04 LTS
   python3-asyncssh                2.5.0-1ubuntu0.1~esm1
                                   Available with Ubuntu Pro

Ubuntu 20.04 LTS
   python3-asyncssh                1.12.2-1ubuntu0.1

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

References:
   https://ubuntu.com/security/notices/USN-7051-1
   CVE-2023-48795

Package Information:
https://launchpad.net/ubuntu/+source/python-asyncssh/2.10.1-2ubuntu0.1
https://launchpad.net/ubuntu/+source/python-asyncssh/1.12.2-1ubuntu0.1

Ubuntu 7051-1: AsyncSSH Security Advisory Updates

October 2, 2024
A protocol flaw was fixed in AsyncSSH.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: A protocol flaw was fixed in AsyncSSH. Software Description: - python-asyncssh: asyncio-based client and server implementation of SSHv2 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 24.04 LTS   python3-asyncssh                2.10.1-2ubuntu0.1 Ubuntu 22.04 LTS   python3-asyncssh                2.5.0-1ubuntu0.1~esm1                                   Available with Ubuntu Pro Ubuntu 20.04 LTS   python3-asyncssh                1.12.2-1ubuntu0.1 In general, a standard system update will make all the necessary changes.

References

  https://ubuntu.com/security/notices/USN-7051-1

  CVE-2023-48795

Severity
Ubuntu Security Notice USN-7051-1

Package Information

https://launchpad.net/ubuntu/+source/python-asyncssh/2.10.1-2ubuntu0.1 https://launchpad.net/ubuntu/+source/python-asyncssh/1.12.2-1ubuntu0.1

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