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Security Advisory

USN-6238-1: Samba vulnerabilities




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 22.04


It was discovered that Samba incorrectly handled Winbind NTLM authentication responses. An attacker could possibly use this issue to cause Samba to crash, resulting in a denial of service. (CVE-2022-2127) Andreas Schneider discovered that Samba incorrectly enforced SMB2 packet signing. A remote attacker could possibly use this issue to obtain or modify sensitive information. This issue only affected Ubuntu 23.04. (CVE-2023-3347) Florent Saudel and Arnaud Gatignolof discovered that Samba incorrectly handled certain Spotlight requests. A remote attacker could possibly use this issue to cause Samba to consume resources, leading to a denial of service. (CVE-2023-34966, CVE-2023-34967) Ralph Boehme and Stefan Metzmacher discovered that Samba incorrectly handled paths returned by Spotlight requests. A remote attacker could possibly use this issue to obtain sensitive information. (CVE-2023-34968) Update Instructions: Run `sudo pro fix USN-6238-1` 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-0ubuntu0.20.04.3 samba – 2:4.15.13+dfsg-0ubuntu0.20.04.3 libnss-winbind – 2:4.15.13+dfsg-0ubuntu0.20.04.3 libpam-winbind – 2:4.15.13+dfsg-0ubuntu0.20.04.3 libsmbclient – 2:4.15.13+dfsg-0ubuntu0.20.04.3 ctdb – 2:4.15.13+dfsg-0ubuntu0.20.04.3 smbclient – 2:4.15.13+dfsg-0ubuntu0.20.04.3 libwbclient0 – 2:4.15.13+dfsg-0ubuntu0.20.04.3 samba-testsuite – 2:4.15.13+dfsg-0ubuntu0.20.04.3 samba-common-bin – 2:4.15.13+dfsg-0ubuntu0.20.04.3 winbind – 2:4.15.13+dfsg-0ubuntu0.20.04.3 samba-dsdb-modules – 2:4.15.13+dfsg-0ubuntu0.20.04.3 samba-dev – 2:4.15.13+dfsg-0ubuntu0.20.04.3 libsmbclient-dev – 2:4.15.13+dfsg-0ubuntu0.20.04.3 samba-vfs-modules – 2:4.15.13+dfsg-0ubuntu0.20.04.3 samba-common – 2:4.15.13+dfsg-0ubuntu0.20.04.3 registry-tools – 2:4.15.13+dfsg-0ubuntu0.20.04.3 samba-libs – 2:4.15.13+dfsg-0ubuntu0.20.04.3 python3-samba – 2:4.15.13+dfsg-0ubuntu0.20.04.3 No subscription required

CVEs contained in this USN include: CVE-2022-2127, CVE-2023-3347, CVE-2023-34966, CVE-2023-34967, CVE-2023-34968.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs4
    • All versions prior to 1.23.0
  • CF Deployment
    • All versions prior to 31.4.0


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 1.23.0 or greater
  • CF Deployment
    • Upgrade all versions to 31.4.0 or greater


2023-08-10: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR