CVE-2010-4021

Name	CVE-2010-4021
Description	The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a "KrbFastReq forgery issue."
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
krb5 (PTS)	buster	1.17-3+deb10u4	fixed
	buster (security)	1.17-3+deb10u6	fixed
	bullseye	1.18.3-6+deb11u4	fixed
	bullseye (security)	1.18.3-6+deb11u3	fixed
	bookworm	1.20.1-2+deb12u1	fixed
	trixie	1.20.1-5	fixed
	sid	1.20.1-6	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
krb5	source	lenny	(not affected)
krb5	source	(unstable)	1.8+dfsg~alpha1-1

[lenny] - krb5 <not-affected> (Only affects 1.7.x)