CVE-2016-3120

NameCVE-2016-3120
DescriptionThe 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.
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)
ReferencesDLA-1265-1
NVD severitymedium (attack range: remote)
Debian Bugs832572

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
krb5 (PTS)jessie1.12.1+dfsg-19+deb8u4fixed
jessie (security)1.12.1+dfsg-19+deb8u5fixed
stretch1.15-1+deb9u1fixed
buster1.17-3fixed
bullseye, sid1.17-6fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
krb5source(unstable)1.14.3+dfsg-1medium832572
krb5sourcejessie1.12.1+dfsg-19+deb8u3medium
krb5sourcewheezy1.10.1+dfsg-5+deb7u9mediumDLA-1265-1

Notes

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

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