========================================================================== Ubuntu Security Notice USN-6425-2 October 11, 2023
samba regression ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: USN-6425-1 introduced a regression in Samba. Software Description: - samba: SMB/CIFS file, print, and login server for Unix Details: USN-6425-1 fixed vulnerabilities in Samba. Due to a build issue on Ubuntu 20.04 LTS, the update introduced regressions in macro handling and possibly other functionality. This update fixes the problem. We apologize for the inconvenience. Original advisory details: 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: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: samba 2:4.15.13+dfsg-0ubuntu0.20.04.7 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-6425-2 https://ubuntu.com/security/notices/USN-6425-1 https://launchpad.net/bugs/2039031 Package Information: https://launchpad.net/ubuntu/+source/samba/2:4.15.13+dfsg-0ubuntu0.20.04.7
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