USN-5339-1: Linux kernel vulnerabilities | Cloud Foundry

Severity

High

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 16.04
• Canonical Ubuntu 18.04

Description

Yiqi Sun and Kevin Wang discovered that the cgroups implementation in the Linux kernel did not properly restrict access to the cgroups v1 release_agent feature. A local attacker could use this to gain administrative privileges. (CVE-2022-0492) It was discovered that an out-of-bounds (OOB) memory access flaw existed in the f2fs module of the Linux kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506) Brendan Dolan-Gavitt discovered that the Marvell WiFi-Ex USB device driver in the Linux kernel did not properly handle some error conditions. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-43976) It was discovered that the ARM Trusted Execution Environment (TEE) subsystem in the Linux kernel contained a race condition leading to a use- after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2021-44733) It was discovered that the Phone Network protocol (PhoNet) implementation in the Linux kernel did not properly perform reference counting in some error conditions. A local attacker could possibly use this to cause a denial of service (memory exhaustion). (CVE-2021-45095) Samuel Page discovered that the Transparent Inter-Process Communication (TIPC) protocol implementation in the Linux kernel contained a stack-based buffer overflow. A remote attacker could use this to cause a denial of service (system crash) for systems that have a TIPC bearer configured. (CVE-2022-0435)

CVEs contained in this USN include: CVE-2021-3506, CVE-2021-44733, CVE-2021-45095, CVE-2021-43976, CVE-2022-0435, CVE-2022-0492.

Affected Cloud Foundry Products and Versions

Severity is high unless otherwise noted.

• Bionic Stemcells
  • 1.x versions prior to 1.71
  • All other stemcells not listed.
• cflinuxfs3
  • All versions prior to 0.279.0
• CF Deployment
  • All versions prior to 20.0.0, or later versions with Bionic Stemcells prior to 1.71 or Xenial Stemcells prior to 621.224

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 1.71 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• cflinuxfs3
  • Upgrade all versions to 0.279.0 or greater
• CF Deployment
  • Upgrade all versions to 20.0.0 or greater, upgrade Bionic Stemcells to 1.71 or greater, and upgrade Xenial Stemcells to 621.224 or greater

References

• USN Notice
• CVE-2021-3506
• CVE-2021-44733
• CVE-2021-45095
• CVE-2021-43976
• CVE-2022-0435
• CVE-2022-0492

History

2022-05-23: Initial vulnerability report published.