| Name | CVE-2021-3671 |
| Description | A null pointer de-reference was found in the way samba kerberos server handled missing sname in TGS-REQ (Ticket Granting Server - Request). An authenticated user could use this flaw to crash the samba server. |
| Source | CVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub advisories/code/issues, web search, more) |
| References | DLA-3206-1, DSA-5287-1 |
| Debian Bugs | 996586 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| heimdal (PTS) | buster | 7.5.0+dfsg-3 | vulnerable |
| buster (security) | 7.5.0+dfsg-3+deb10u2 | fixed |
| bullseye | 7.7.0+dfsg-2+deb11u2 | fixed |
| bullseye (security) | 7.7.0+dfsg-2+deb11u3 | fixed |
| bookworm, sid | 7.8.git20221117.28daf24+dfsg-1.1 | fixed |
| samba (PTS) | buster, buster (security) | 2:4.9.5+dfsg-5+deb10u3 | vulnerable |
| bullseye (security), bullseye | 2:4.13.13+dfsg-1~deb11u5 | fixed |
| bookworm, sid | 2:4.17.6+dfsg-1 | fixed |
The information below is based on the following data on fixed versions.
Notes
[stretch] - heimdal <no-dsa> (Minor issue)
[buster] - samba <no-dsa> (Minor issue)
[stretch] - samba <no-dsa> (Minor issue)
https://bugzilla.redhat.com/show_bug.cgi?id=2013080
https://bugzilla.samba.org/show_bug.cgi?id=14770
https://github.com/heimdal/heimdal/security/advisories/GHSA-h9qj-cpmq-3562
Fixed by: https://github.com/heimdal/heimdal/commit/04171147948d0a3636bc6374181926f0fb2ec83a
Followup: https://github.com/heimdal/heimdal/commit/773802aecfb4b6a73817fa522faeb55b2a7cdb2a
"Equivalent" issue for CVE-2021-37750 for the MIT krb5 vulnerability.
Fixed by (Samba): https://gitlab.com/samba-team/samba/-/commit/0cb4b939f192376bf5e33637863a91a20f74c5a5