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Bug 1361050 - (CVE-2016-3120) CVE-2016-3120 krb5: S4U2Self KDC crash when anon is restricted
CVE-2016-3120 krb5: S4U2Self KDC crash when anon is restricted
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20160719,reported=2...
: Security
Depends On: 1361051 1361504
Blocks: 1323912 1361052
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Reported: 2016-07-28 05:19 EDT by Adam Mariš
Modified: 2016-11-06 00:20 EDT (History)
37 users (show)

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Doc Text:
A NULL pointer dereference flaw was found in MIT Kerberos krb5kdc service. An authenticated attacker could use this flaw to cause krb5kdc to dereference a null pointer and crash by making an S4U2Self request, if the restrict_anonymous_to_tgt option was set to true.
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Environment:
Last Closed: 2016-11-06 00:20:17 EDT
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Regression: ---
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2591 normal SHIPPED_LIVE Low: krb5 security, bug fix, and enhancement update 2016-11-03 08:10:29 EDT

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Description Adam Mariš 2016-07-28 05:19:46 EDT 
It was found that in MIT krb5 1.9 and later, an authenticated attacker can cause krb5kdc to dereference a null pointer if the restrict_anonymous_to_tgt option is set to true, by making an S4U2Self request.

Upstream patch:

https://github.com/krb5/krb5/commit/93b4a6306a0026cf1cc31ac4bd8a49ba5d034ba7
Comment 1 Adam Mariš 2016-07-28 05:20:20 EDT 
Created krb5 tracking bugs for this issue:

Affects: fedora-all [bug 1361051]
Comment 3 Fedora Update System 2016-08-01 12:23:05 EDT 
krb5-1.14.1-8.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Comment 4 Fedora Update System 2016-08-31 08:21:45 EDT 
krb5-1.14.3-4.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 5 Fedora Update System 2016-09-01 14:50:23 EDT 
krb5-1.14.3-8.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Comment 8 errata-xmlrpc 2016-11-03 16:25:33 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2591 https://rhn.redhat.com/errata/RHSA-2016-2591.html
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