Severity

high

Vendor

VMware Tanzu

Versions Affected

• Canonical Ubuntu 14.04
• Canonical Ubuntu 16.04

Description

It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. (CVE-2021-3493)

Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29154)

CVEs contained in this USN include: CVE-2021-29154, CVE-2021-3493

Affected VMware Products and Versions

Severity is high unless otherwise noted.

• Isolation Segment
  • 2.7.x versions with Xenial Stemcells prior to 456.158
  • 2.8.x versions with Xenial Stemcells prior to 621.123
  • 2.9.x versions with Xenial Stemcells prior to 621.123
  • 2.10.x versions with Xenial Stemcells prior to 621.123
  • 2.11.x versions with Xenial Stemcells prior to 621.123
• Operations Manager
  • 2.9.x versions prior to 2.9.19
  • 2.10.x versions prior to 2.10.10
• VMware Tanzu Application Service for VMs
  • 2.7.x versions with Xenial Stemcells prior to 456.158
  • 2.8.x versions with Xenial Stemcells prior to 621.123
  • 2.9.x versions with Xenial Stemcells prior to 621.123
  • 2.10.x versions with Xenial Stemcells prior to 621.123
  • 2.11.x versions with Xenial Stemcells prior to 621.123
  • 2.12.x versions with Xenial Stemcells prior to 621.123

Mitigation

Users of affected products are strongly encouraged to follow the mitigation below. On the Tanzu Network product page for each release, check the Depends On section and/or Release Notes for this information. Releases that have fixed this issue include:

• Isolation Segment
  • 2.7.x: Upgrade Xenial Stemcells to 456.158 or greater
  • 2.8.x: Upgrade Xenial Stemcells to 621.123 or greater
  • 2.9.x: Upgrade Xenial Stemcells to 621.123 or greater
  • 2.10.x: Upgrade Xenial Stemcells to 621.123 or greater
  • 2.11.x: Upgrade Xenial Stemcells to 621.123 or greater
• Operations Manager
  • 2.9.19
  • 2.10.10
• VMware Tanzu Application Service for VMs
  • 2.7.x: Upgrade Xenial Stemcells to 456.158 or greater
  • 2.8.x: Upgrade Xenial Stemcells to 621.123 or greater
  • 2.9.x: Upgrade Xenial Stemcells to 621.123 or greater
  • 2.10.x: Upgrade Xenial Stemcells to 621.123 or greater
  • 2.11.x: Upgrade Xenial Stemcells to 621.123 or greater
  • 2.12.x: Upgrade Xenial Stemcells to 621.123 or greater

References

• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-29154
• https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3493
• https://ubuntu.com/security/notices/USN-4916-1

History

2021-12-07: Initial vulnerability report published.