USN-5959-1: Kerberos vulnerabilities Severity | Cloud Foundry

Severity

Medium

Vendor

Canonical Ubuntu

Versions Affected

• Canonical Ubuntu 18.04

Description

It was discovered that Kerberos incorrectly handled memory when processing KDC data, which could lead to a NULL pointer dereference. An attacker could possibly use this issue to cause a denial of service or have other unspecified impacts. (CVE-2021-36222, CVE-2021-37750) Update Instructions: Run sudo pro fix USN-5959-1 to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libk5crypto3 – 1.16-2ubuntu0.4 krb5-kpropd – 1.16-2ubuntu0.4 libkdb5-9 – 1.16-2ubuntu0.4 krb5-user – 1.16-2ubuntu0.4 libgssrpc4 – 1.16-2ubuntu0.4 libkrb5support0 – 1.16-2ubuntu0.4 krb5-doc – 1.16-2ubuntu0.4 libkrb5-dev – 1.16-2ubuntu0.4 krb5-pkinit – 1.16-2ubuntu0.4 libkrb5-3 – 1.16-2ubuntu0.4 krb5-kdc-ldap – 1.16-2ubuntu0.4 krb5-otp – 1.16-2ubuntu0.4 krb5-gss-samples – 1.16-2ubuntu0.4 libkrad-dev – 1.16-2ubuntu0.4 krb5-locales – 1.16-2ubuntu0.4 libgssapi-krb5-2 – 1.16-2ubuntu0.4 krb5-kdc – 1.16-2ubuntu0.4 krb5-multidev – 1.16-2ubuntu0.4 krb5-k5tls – 1.16-2ubuntu0.4 libkrad0 – 1.16-2ubuntu0.4 libkadm5srv-mit11 – 1.16-2ubuntu0.4 libkadm5clnt-mit11 – 1.16-2ubuntu0.4 krb5-admin-server – 1.16-2ubuntu0.4 No subscription required

CVEs contained in this USN include: CVE-2021-36222, CVE-2021-37750.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• Bionic Stemcells
  • 1.x versions prior to 1.188
  • All other stemcells not listed.
• cflinuxfs3
  • All versions prior to 0.357.0
• CF Deployment
  • All versions prior to 27.4.0, or later versions with Bionic Stemcells prior to 1.188

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 1.188 or greater
  • All other stemcells should be upgraded to the latest version available on bosh.io.
• cflinuxfs3
  • Upgrade all versions to 0.357.0 or greater
• CF Deployment
  • Upgrade all versions to 27.4.0 or greater and upgrade Bionic Stemcells to 1.188 or greater

References

• USN Notice
• CVE-2021-36222
• CVE-2021-37750

History

2023-04-29: Initial vulnerability report published.v