Severity

Low

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 16.04
• Canonical Ubuntu 18.04

Description

It was discovered that klibc did not properly perform some mathematical operations, leading to an integer overflow. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-31870) It was discovered that klibc did not properly handled some memory allocations on 64 bit systems. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-31871) It was discovered that klibc did not properly handled some file sizes values on 32 bit systems. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-31872) It was discovered that klibc did not properly handled some memory allocations. An attacker could possibly use this issue to cause a crash, resulting in a denial of service, or possibly execute arbitrary code. (CVE-2021-31873) Update Instructions: Run sudo ua fix USN-5379-1 to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: klibc-utils – 2.0.4-8ubuntu1.16.04.4+esm1 libklibc – 2.0.4-8ubuntu1.16.04.4+esm1 libklibc-dev – 2.0.4-8ubuntu1.16.04.4+esm1 Available with UA Infra or UA Desktop: https://ubuntu.com/advantage

CVEs contained in this USN include: CVE-2021-31870, CVE-2021-31871, CVE-2021-31872, CVE-2021-31873.

Affected Cloud Foundry Products and Versions

Severity is low unless otherwise noted.

• Bionic Stemcells
  • 1.x versions prior to 1.79
  • All other stemcells not listed.
• cflinuxfs3
  • All versions prior to 0.286.0
• CF Deployment
  • All versions prior to 20.0.0, or later versions with Bionic Stemcells prior to 1.79 or Xenial Stemcells prior to 621.236

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below.

The Cloud Foundry project recommends upgrading the following releases:

• Bionic Stemcells
  • Upgrade 1.x versions to 1.79 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• cflinuxfs3
  • Upgrade all versions to 0.286.0 or greater
• CF Deployment
  • Upgrade all versions to 20.0.0 or greater, upgrade Bionic Stemcells to 1.79 or greater, and upgrade Xenial Stemcells to 621.236 or greater

References

• USN Notice
• CVE-2021-31870
• CVE-2021-31871
• CVE-2021-31872
• CVE-2021-31873

History

2022-05-23: Initial vulnerability report published.