DescriptionIn Heimdal through 7.4, remote unauthenticated attackers are able to crash the KDC by sending a crafted UDP packet containing empty data fields for client name or realm. The parser would unconditionally dereference NULL pointers in that case, leading to a segmentation fault. This is related to the _kdc_as_rep function in kdc/kerberos5.c and the der_length_visible_string function in lib/asn1/der_length.c.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
NVD severitymedium
Debian Bugs878144

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
heimdal (PTS)stretch (security), stretch7.1.0+dfsg-13+deb9u3fixed
bookworm, sid, bullseye7.7.0+dfsg-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
heimdalsourcewheezy(not affected)
heimdalsourcejessie(not affected)


[jessie] - heimdal <not-affected> (Vulnerability introduced in 7.0)
[wheezy] - heimdal <not-affected> (Vulnerability introduced in 7.0)
Fixed by: (7.1)
Fixed by: (master)

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