Bug 1026942 - (CVE-2013-1418) CVE-2013-1418 krb5: multi-realm KDC null dereference leads to crash
CVE-2013-1418 krb5: multi-realm KDC null dereference leads to crash
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20131104,repor...
: Security
Depends On: 1026981 1026997 1089845 1121510
Blocks: 1026945 1063682 1101912
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Reported: 2013-11-05 12:11 EST by Vincent Danen
Modified: 2015-10-15 14:04 EDT (History)
9 users (show)

See Also:
Fixed In Version: krb5 1.10.7
Doc Type: Bug Fix
Doc Text:
It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request.
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Last Closed: 2014-10-14 05:19:55 EDT
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Description Vincent Danen 2013-11-05 12:11:13 EST
It was reported [1] that if a KDC serves multiple realms, certain requests could cause the setup_server_realm() funtion to dereference a null pointer, resulting in a crash of the KDC (Key Distribution Center).  This can be triggered by an unauthenticated user.

This has been correct in git [2].

[1] http://mailman.mit.edu/pipermail/krb5-bugs/2013-November/010206.html
[2] https://github.com/krb5/krb5/commit/5d2d9a1abe46a2c1a8614d4672d08d9d30a5f8bf
Comment 2 Vincent Danen 2013-11-05 14:20:00 EST
Upstream ticket:

http://krbdev.mit.edu/rt/Ticket/Display.html?id=7757
Comment 3 Vincent Danen 2013-11-05 15:41:01 EST
Created krb5 tracking bugs for this issue:

Affects: fedora-all [bug 1026997]
Comment 4 Fedora Update System 2013-11-11 19:28:10 EST
krb5-1.11.3-29.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2013-12-03 05:37:19 EST
krb5-1.11.3-13.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 Huzaifa S. Sidhpurwala 2013-12-30 04:07:14 EST
Note: This issue can be triggered only if multiple realms are served from one KDC

Statement:

(none)
Comment 12 Martin Prpič 2014-09-09 05:47:11 EDT
IssueDescription:

It was found that if a KDC served multiple realms, certain requests could cause the setup_server_realm() function to dereference a NULL pointer. A remote, unauthenticated attacker could use this flaw to crash the KDC using a specially crafted request.
Comment 13 errata-xmlrpc 2014-09-16 01:29:04 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:1245 https://rhn.redhat.com/errata/RHSA-2014-1245.html
Comment 14 errata-xmlrpc 2014-10-14 04:10:34 EDT
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:1389 https://rhn.redhat.com/errata/RHSA-2014-1389.html

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