USN-6425-1: Samba vulnerabilities

Severity

Medium

Vendor

Canonical Ubuntu

Description

Sri Nagasubramanian discovered that the Samba acl_xattr VFS module incorrectly handled read-only files. When Samba is configured to ignore system ACLs, a remote attacker could possibly use this issue to truncate read-only files. (CVE-2023-4091) Andrew Bartlett discovered that Samba incorrectly handled the DirSync control. A remote attacker with an RODC DC account could possibly use this issue to obtain all domain secrets. (CVE-2023-4154) Andrew Bartlett discovered that Samba incorrectly handled the rpcecho development server. A remote attacker could possibly use this issue to cause Samba to stop responding, resulting in a denial of service. (CVE-2023-42669) Kirin van der Veer discovered that Samba incorrectly handled certain RPC service listeners. A remote attacker could possibly use this issue to cause Samba to start multiple incompatible RPC listeners, resulting in a denial of service. This issue only affected Ubuntu 22.04 LTS, and Ubuntu 23.04. (CVE-2023-42670) Update Instructions: Run `sudo pro fix USN-6425-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: libwbclient-dev – 2:4.15.13+dfsg-0ubuntu1.5 samba – 2:4.15.13+dfsg-0ubuntu1.5 libnss-winbind – 2:4.15.13+dfsg-0ubuntu1.5 libpam-winbind – 2:4.15.13+dfsg-0ubuntu1.5 libsmbclient – 2:4.15.13+dfsg-0ubuntu1.5 smbclient – 2:4.15.13+dfsg-0ubuntu1.5 winbind – 2:4.15.13+dfsg-0ubuntu1.5 samba-testsuite – 2:4.15.13+dfsg-0ubuntu1.5 python3-samba – 2:4.15.13+dfsg-0ubuntu1.5 samba-common-bin – 2:4.15.13+dfsg-0ubuntu1.5 libwbclient0 – 2:4.15.13+dfsg-0ubuntu1.5 samba-dsdb-modules – 2:4.15.13+dfsg-0ubuntu1.5 samba-dev – 2:4.15.13+dfsg-0ubuntu1.5 libsmbclient-dev – 2:4.15.13+dfsg-0ubuntu1.5 samba-vfs-modules – 2:4.15.13+dfsg-0ubuntu1.5 samba-common – 2:4.15.13+dfsg-0ubuntu1.5 registry-tools – 2:4.15.13+dfsg-0ubuntu1.5 samba-libs – 2:4.15.13+dfsg-0ubuntu1.5 ctdb – 2:4.15.13+dfsg-0ubuntu1.5 No subscription required

CVEs contained in this USN include: CVE-2023-4091, CVE-2023-4154, CVE-2023-42669, CVE-2023-42670.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

• cflinuxfs4
  • All versions prior to 1.42.0
• CF Deployment
  • All versions prior to 32.15.0

Mitigation

Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

• cflinuxfs4
  • Upgrade all versions to 1.42.0 or greater
• CF Deployment
  • Upgrade all versions to 32.15.0 or greater

History

2023-11-09: Initial vulnerability report published.