CVE-2021-3738

Published: 9 November 2021

In DCE/RPC it is possible to share the handles (cookies for resource state) between multiple connections via a mechanism called 'association groups'. These handles can reference connections to our sam.ldb database. However while the database was correctly shared, the user credentials state was only pointed at, and when one connection within that association group ended, the database would be left pointing at an invalid 'struct session_info'. The most likely outcome here is a crash, but it is possible that the use-after-free could instead allow different user state to be pointed at and this might allow more privileged access.

Notes

Fixing this in Ubuntu 18.04 LTS would require substantial
code backports. We will not be fixing this issue in Ubuntu 18.04
LTS. In environments where this is of concern, we recommend
updating to a more recent Ubuntu version.

Priority

Medium

CVSS 3 base score: 8.8

Status

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3738
• https://www.samba.org/samba/security/CVE-2021-3738.html
• https://www.samba.org/samba/history/samba-4.13.14.html
• https://ubuntu.com/security/notices/USN-5142-1
• NVD
• Launchpad
• Debian

Bugs

• https://bugzilla.samba.org/show_bug.cgi?id=14468