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Security Advisory

USN-5268-1: Linux kernel vulnerabilities

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04

Description

Keyu Man discovered that the ICMP implementation in the Linux kernel did not properly handle received ICMP error packets. A remote attacker could use this to facilitate attacks on UDP based services that depend on source port randomization. (CVE-2021-20322) It was discovered that the Bluetooth subsystem in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3640) Likang Luo discovered that a race condition existed in the Bluetooth subsystem of the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-3752) Luo Likang discovered that the FireDTV Firewire driver in the Linux kernel did not properly perform bounds checking in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-42739)

CVEs contained in this USN include: CVE-2021-42739, CVE-2021-20322, CVE-2021-3640, CVE-2021-3752.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.61
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.274.0
  • CF Deployment
    • All versions prior to 18.0.0, or later versions with Xenial Stemcells prior to 621.208

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 1.61 or greater
    • All other stemcells should be upgraded to the latest version available onĀ bosh.io.
  • cflinuxfs3
    • Upgrade all versions to 0.274.0 or greater
  • CF Deployment
    • Upgrade all versions to 18.0.0 or greater and upgrade Xenial Stemcells to 621.208 or greater

History

2022-03-10: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR

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