| 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, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
| References | DLA-3206-1, DSA-5287-1, ELA-795-1, ELA-797-1 |
| Debian Bugs | 996586 |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| heimdal (PTS) | jessie, jessie (lts) | 1.6~rc2+dfsg-9+deb8u3 | fixed |
| stretch (security) | 7.1.0+dfsg-13+deb9u3 | vulnerable | |
| stretch (lts), stretch | 7.1.0+dfsg-13+deb9u4 | fixed | |
| buster (security), buster, buster (lts) | 7.5.0+dfsg-3+deb10u2 | fixed | |
| bullseye (security), bullseye | 7.7.0+dfsg-2+deb11u3 | fixed | |
| bookworm | 7.8.git20221117.28daf24+dfsg-2 | fixed | |
| sid, trixie | 7.8.git20221117.28daf24+dfsg-8 | fixed | |
| samba (PTS) | jessie, jessie (lts) | 2:4.2.14+dfsg-0+deb8u16 | vulnerable |
| stretch (security) | 2:4.5.16+dfsg-1+deb9u4 | vulnerable | |
| stretch (lts), stretch | 2:4.5.16+dfsg-1+deb9u5 | vulnerable | |
| buster (security), buster, buster (lts) | 2:4.9.5+dfsg-5+deb10u5 | vulnerable | |
| bullseye (security), bullseye | 2:4.13.13+dfsg-1~deb11u6 | fixed | |
| bookworm (security), bookworm | 2:4.17.12+dfsg-0+deb12u1 | fixed | |
| trixie | 2:4.21.2+dfsg-3 | fixed | |
| sid | 2:4.21.2+dfsg-4 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| heimdal | source | jessie | 1.6~rc2+dfsg-9+deb8u3 | ELA-797-1 | ||
| heimdal | source | stretch | 7.1.0+dfsg-13+deb9u4 | ELA-795-1 | ||
| heimdal | source | buster | 7.5.0+dfsg-3+deb10u1 | DLA-3206-1 | ||
| heimdal | source | bullseye | 7.7.0+dfsg-2+deb11u2 | DSA-5287-1 | ||
| heimdal | source | (unstable) | 7.7.0+dfsg-3 | 996586 | ||
| samba | source | bullseye | 2:4.13.13+dfsg-1~deb11u1 | |||
| samba | source | (unstable) | 2:4.13.13+dfsg-1 |
[stretch] - heimdal <no-dsa> (Minor issue)
[buster] - samba <ignored> (Domain controller functionality is EOLed, see DSA-5015-1)
[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
[jessie] - samba <ignored> (Minor issue; affects Samba as AD DC; EOLed)
<ignored> also in stretch because it affects Samba as AD DC; EOLed