Severity
Medium
Vendor
Canonical Ubuntu
Versions Affected
- Canonical Ubuntu 16.04
- Canonical Ubuntu 18.04
Description
It was discovered that Nettle incorrectly handled signature verification. A remote attacker could use this issue to cause Nettle to crash, resulting in a denial of service, or possibly force invalid signatures.
CVEs contained in this USN include: CVE-2021-20305.
Affected Cloud Foundry Products and Versions
Severity is medium unless otherwise noted.
- cflinuxfs3
- All versions prior to 0.235.0
- Xenial Stemcells
- 456.x versions prior to 456.158
- 621.x versions prior to 621.123
- All other stemcells not listed.
- CF Deployment
- All versions prior to 16.13.0
Mitigation
Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:
- cflinuxfs3
- Upgrade all versions to 0.235.0 or greater
- Xenial Stemcells
- Upgrade 456.x versions to 456.158 or greater
- Upgrade 621.x versions to 621.123 or greater
- All other stemcells should be upgraded to the latest version available on bosh.io.
- CF Deployment
- Upgrade all versions to 16.13.0 or greater
References
History
2021-04-29: Initial vulnerability report published.
