USN-5174-2: Samba regression

Severity

Unknown

Vendor

Canonical Ubuntu

Description

USN-5174-1 fixed vulnerabilities in Samba. Some of the changes introduced a regression in Kerberos authentication in certain environments. Please see the following upstream bug for more information: https://bugzilla.samba.org/show_bug.cgi?id=14922 This update fixes the problem. Original advisory details: Stefan Metzmacher discovered that Samba incorrectly handled SMB1 client connections. A remote attacker could possibly use this issue to downgrade connections to plaintext authentication. (CVE-2016-2124) Andrew Bartlett discovered that Samba incorrectly mapping domain users to local users. An authenticated attacker could possibly use this issue to become root on domain members. (CVE-2020-25717) Andrew Bartlett discovered that Samba did not properly check sensitive attributes. An authenticated attacker could possibly use this issue to escalate privileges. (CVE-2020-25722) Joseph Sutton discovered that Samba incorrectly handled certain TGS requests. An authenticated attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2021-3671) The fix for CVE-2020-25717 results in possible behaviour changes that could affect certain environments. Please see the upstream advisory for more information: https://www.samba.org/samba/security/CVE-2020-25717.html

Affected Cloud Foundry Products and Versions

Severity is unknown unless otherwise noted.

• cflinuxfs3
  • All versions prior to 0.270.0
• CF Deployment
  • All versions prior to 17.1.0

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 0.270.0 or greater
• CF Deployment
  • Upgrade all versions to 17.1.0 or greater

History

2022-01-20: Initial vulnerability report published.