Severity
Medium
Vendor
Canonical Ubuntu
Versions Affected
- Canonical Ubuntu 22.04
Description
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. (CVE-2023-48795) Luci Stanescu discovered that OpenSSH incorrectly added destination constraints when smartcard keys were added to ssh-agent, contrary to expectations. This issue only affected Ubuntu 22.04 LTS, and Ubuntu 23.04. (CVE-2023-28531) Update Instructions: Run `sudo pro fix USN-6560-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: openssh-client – 1:8.9p1-3ubuntu0.5 openssh-server – 1:8.9p1-3ubuntu0.5 ssh-askpass-gnome – 1:8.9p1-3ubuntu0.5 ssh – 1:8.9p1-3ubuntu0.5 openssh-tests – 1:8.9p1-3ubuntu0.5 openssh-sftp-server – 1:8.9p1-3ubuntu0.5 No subscription required
CVEs contained in this USN include: CVE-2023-48795, CVE-2023-28531.
Affected Cloud Foundry Products and Versions
Severity is medium unless otherwise noted.
- cflinuxfs4
- All versions prior to 1.62.0
- Jammy Stemcells
- 1.x versions prior to 1.340
- All other stemcells not listed.
- CF Deployment
- All versions with Jammy Stemcells prior to 1.340
Mitigation
Users of affected products are strongly encouraged to follow the mitigations below.
The Cloud Foundry project recommends upgrading the following releases:
- cflinuxfs4
- Upgrade all versions to 1.62.0 or greater
- Jammy Stemcells
- Upgrade 1.x versions to 1.340 or greater
- All other stemcells should be upgraded to the latest version available on bosh.io.
- CF Deployment
- For all versions, upgrade Jammy Stemcells to 1.340 or greater
References
History
2024-02-29: Initial vulnerability report published.
