A Samba security update has been released for Ubuntu Linux 20.04 LTS and 22.04 LTS.

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Ubuntu Security Notice USN-5542-1
August 01, 2022

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Samba.

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

Details:

It was discovered that Samba did not handle MaxQueryDuration when being
used in AD DC configurations, contrary to expectations. This issue only
affected Ubuntu 20.04 LTS. (CVE-2021-3670)

Luke Howard discovered that Samba incorrectly handled certain restrictions
associated with changing passwords. A remote attacker being requested to
change passwords could possibly use this issue to escalate privileges.
(CVE-2022-2031)

Luca Moro discovered that Samba incorrectly handled certain SMB1
communications. A remote attacker could possibly use this issue to obtain
sensitive memory contents. (CVE-2022-32742)

Joseph Sutton discovered that Samba incorrectly handled certain password
change requests. A remote attacker could use this issue to change passwords
of other users, resulting in privilege escalation. (CVE-2022-32744)

Joseph Sutton discovered that Samba incorrectly handled certain LDAP add or
modify requests. A remote attacker could possibly use this issue to cause
Samba to crash, resulting in a denial of service. (CVE-2022-32745)

Joseph Sutton and Andrew Bartlett discovered that Samba incorrectly handled
certain LDAP add or modify requests. A remote attacker could possibly use
this issue to cause Samba to crash, resulting in a denial of service.
(CVE-2022-32746)

Update instructions:

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

Ubuntu 22.04 LTS:
samba 2:4.15.9+dfsg-0ubuntu0.2

Ubuntu 20.04 LTS:
samba 2:4.13.17~dfsg-0ubuntu1.20.04.1

The update for Ubuntu 22.04 LTS uses a new upstream release, which includes
additional bug fixes. In general, a standard system update will make all
the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5542-1
CVE-2021-3670, CVE-2022-2031, CVE-2022-32742, CVE-2022-32744,
CVE-2022-32745, CVE-2022-32746

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.15.9+dfsg-0ubuntu0.2
  https://launchpad.net/ubuntu/+source/samba/2:4.13.17~dfsg-0ubuntu1.20.04.1