CVE-2016-3120

Name	CVE-2016-3120
Description	The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.
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-1265-1
Debian Bugs	832572

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
krb5 (PTS)	bullseye (security), bullseye	1.18.3-6+deb11u5	fixed
	bookworm, bookworm (security)	1.20.1-2+deb12u2	fixed
	sid, trixie	1.21.3-3	fixed

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

Package	Type	Release	Fixed Version	Origin	Debian Bugs
krb5	source	wheezy	1.10.1+dfsg-5+deb7u9	DLA-1265-1
krb5	source	jessie	1.12.1+dfsg-19+deb8u3
krb5	source	(unstable)	1.14.3+dfsg-1		832572

https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
http://krbdev.mit.edu/rt/Ticket/Display.html?id=8458