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Security Advisory

USN-5570-1: zlib vulnerability

USN-5570-1: zlib vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 16.04
  • Canonical Ubuntu 18.04


Evgeny Legerov discovered that zlib incorrectly handled memory when performing certain inflate operations. An attacker could use this issue to cause zlib to crash, resulting in a denial of service, or possibly execute arbitrary code. Update Instructions: Run `sudo ua fix USN-5570-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libx32z1-dev – 1:1.2.8.dfsg-2ubuntu4.3+esm2 lib64z1 – 1:1.2.8.dfsg-2ubuntu4.3+esm2 libx32z1 – 1:1.2.8.dfsg-2ubuntu4.3+esm2 lib64z1-dev – 1:1.2.8.dfsg-2ubuntu4.3+esm2 lib32z1 – 1:1.2.8.dfsg-2ubuntu4.3+esm2 zlib1g – 1:1.2.8.dfsg-2ubuntu4.3+esm2 lib32z1-dev – 1:1.2.8.dfsg-2ubuntu4.3+esm2 zlib1g-dev – 1:1.2.8.dfsg-2ubuntu4.3+esm2 Available with UA Infra or UA Desktop:

CVEs contained in this USN include: CVE-2022-37434.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • Bionic Stemcells
    • 1.x versions prior to 1.97
    • All other stemcells not listed.
  • cflinuxfs3
    • All versions prior to 0.316.0
  • CF Deployment
    • All versions


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 1.97 or greater
    • All other stemcells should be upgraded to the latest version available on
  • cflinuxfs3
    • Upgrade all versions to 0.316.0 or greater
  • CF Deployment
    • There are no fixed versions of this product


2022-08-25: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR