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Ubuntu Security Notice USN-6238-1
July 19, 2023

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

- Ubuntu 23.04
- Ubuntu 22.10
- 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 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:

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

Ubuntu 23.04:
   samba                           2:4.17.7+dfsg-1ubuntu1.1

Ubuntu 22.10:
   samba                           2:4.16.8+dfsg-0ubuntu1.2

Ubuntu 22.04 LTS:
   samba                           2:4.15.13+dfsg-0ubuntu1.2

Ubuntu 20.04 LTS:
   samba                           2:4.15.13+dfsg-0ubuntu0.20.04.3

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

References:
   https://ubuntu.com/security/notices/USN-6238-1
   CVE-2022-2127, CVE-2023-3347, CVE-2023-34966, CVE-2023-34967,
   CVE-2023-34968

Package Information:
   https://launchpad.net/ubuntu/+source/samba/2:4.17.7+dfsg-1ubuntu1.1
   https://launchpad.net/ubuntu/+source/samba/2:4.16.8+dfsg-0ubuntu1.2
   https://launchpad.net/ubuntu/+source/samba/2:4.15.13+dfsg-0ubuntu1.2
   https://launchpad.net/ubuntu/+source/samba/2:4.15.13+dfsg-0ubuntu0.20.04.3