[USN-7582-2] Samba regression

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Ubuntu Security Notice USN-7582-2
June 30, 2025

samba regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

USN-7582-1 introduced a regression in Samba.

Software Description:
- samba: SMB/CIFS file, print, and login server for Unix

Details:

USN-7582-1 fixed vulnerabilities in Samba. The update introduced a
regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

Evgeny Legerov discovered that Samba incorrectly handled buffers in
certain GSSAPI routines of Heimdal. A remote attacker could possibly use
this issue to cause Samba to crash, resulting in a denial of service.
(CVE-2022-3437)

Greg Hudson discovered that Samba incorrectly handled PAC parsing. On
32-bit systems, a remote attacker could use this issue to escalate
privileges, or possibly execute arbitrary code. (CVE-2022-42898)

Joseph Sutton discovered that Samba could be forced to issue rc4-hmac
encrypted Kerberos tickets. A remote attacker could possibly use this
issue to escalate privileges. This issue only affected Ubuntu 20.04 LTS
and Ubuntu 22.04 LTS. (CVE-2022-45141)

Florent Saudel 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)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS
samba 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm2
Available with Ubuntu Pro

Ubuntu 16.04 LTS
samba 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm3
Available with Ubuntu Pro

Ubuntu 14.04 LTS
samba 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm14
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7582-2
https://ubuntu.com/security/notices/USN-7582-1
https://launchpad.net/bugs/2115450