CVE-2021-3671

NameCVE-2021-3671
DescriptionA 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.
SourceCVE (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)
Debian Bugs996586

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
heimdal (PTS)buster7.5.0+dfsg-3vulnerable
bullseye7.7.0+dfsg-2vulnerable
bookworm, sid7.7.0+dfsg-4fixed
samba (PTS)buster, buster (security)2:4.9.5+dfsg-5+deb10u3vulnerable
bullseye2:4.13.13+dfsg-1~deb11u4fixed
bullseye (security)2:4.13.13+dfsg-1~deb11u5fixed
bookworm, sid2:4.16.4+dfsg-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
heimdalsource(unstable)7.7.0+dfsg-3996586
sambasourcebullseye2:4.13.13+dfsg-1~deb11u1
sambasource(unstable)2:4.13.13+dfsg-1

Notes

[bullseye] - heimdal <no-dsa> (Minor issue)
[buster] - heimdal <no-dsa> (Minor issue)
[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
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

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