Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 18.04
• Canonical Ubuntu 22.04

Description

It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a denial of service. This issue only affected Ubuntu 20.10 and Ubuntu 20.04 LTS. (CVE-2023-28755) It was discovered that Ruby incorrectly handled certain regular expressions. An attacker could possibly use this issue to cause a denial of service. This issue exists because of an incomplete fix for CVE-2023-28755. (CVE-2023-36617) Update Instructions: Run sudo pro fix USN-6219-1 to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libruby2.3 – 2.3.1-2~ubuntu16.04.16+esm8 ruby2.3 – 2.3.1-2~ubuntu16.04.16+esm8 ruby2.3-dev – 2.3.1-2~ubuntu16.04.16+esm8 ruby2.3-doc – 2.3.1-2~ubuntu16.04.16+esm8 ruby2.3-tcltk – 2.3.1-2~ubuntu16.04.16+esm8 Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro

CVEs contained in this USN include: CVE-2023-28755, CVE-2023-36617.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• cflinuxfs4
  • All versions prior to 1.0.0
• CF Deployment
  • All versions prior to 30.0.0

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 1.0.0 or greater
• CF Deployment
  • Upgrade all versions to 30.0.0 or greater

References

• USN Notice
• CVE-2023-28755
• CVE-2023-36617

History

2023-09-28: Initial vulnerability report published.