Bug 1121876 – CVE-2014-4343 krb5: double-free flaw in SPNEGO initiators

Bugzilla will be upgraded to version 5.0 on a still to be determined date in the near future. The original upgrade date has been delayed.

Bug 1121876 - (CVE-2014-4343) CVE-2014-4343 krb5: double-free flaw in SPNEGO initiators

Summary:	CVE-2014-4343 krb5: double-free flaw in SPNEGO initiators

Status:	CLOSED ERRATA

Aliases:	CVE-2014-4343

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20140715,reported=2...
Keywords:	Security

Depends On:	1121510 1121789 1121879
Blocks:	1101912 1121513 1121882
	Show dependency tree / graph

Reported:	2014-07-22 02:23 EDT by Murray McAllister
Modified:	2015-03-06 05:10 EST (History)
CC List:	10 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-03-06 05:10:32 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2014:1389	normal	SHIPPED_LIVE	Moderate: krb5 security and bug fix update	2014-10-13 21:27:10 EDT
Red Hat Product Errata	RHSA-2015:0439	normal	SHIPPED_LIVE	Moderate: krb5 security, bug fix and enhancement update	2015-03-05 09:38:14 EST

Groups: None (edit)

Description Murray McAllister 2014-07-22 02:23:03 EDT

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos.

It is reported that this issue affects version 1.10 and later.

Upstream commit and further details:

https://github.com/krb5/krb5/commit/f18ddf5d82de0ab7591a36e465bc24225776940f

Comment 1 Murray McAllister 2014-07-22 02:27:19 EDT

Created krb5 tracking bugs for this issue:

Affects: fedora-all [bug 1121879]

Comment 3 Siddharth Sharma 2014-07-25 02:15:36 EDT

spnego_gss_init_sec_context -> init_ctx_cont -> init_ctx_nego -> init_ctx_reselect 

It is possible for unauthenticated attacker to crash the clients, as in the process according to RFC SPNEGO uses pseudo-mechanism which checks which gssapi mechanisms can be used. SPNEGO is not used by default. It requires high complexity to execute such attack as it also involves spoofing Web Server SSL certificate also.

Comment 4 Siddharth Sharma 2014-07-28 02:49:18 EDT

Statement:

This issue did not affect the version of krb5 as shipped with Red Hat Enterprise Linux 5.

Comment 5 Fedora Update System 2014-08-07 11:27:12 EDT

krb5-1.11.3-24.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2014-08-07 11:32:45 EDT

krb5-1.11.5-10.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 Martin Prpič 2014-10-08 04:40:07 EDT

IssueDescription:

A double-free flaw was found in the MIT Kerberos SPNEGO initiators. An attacker able to spoof packets to appear as though they are from an GSSAPI acceptor could use this flaw to crash a client application that uses MIT Kerberos.

Comment 8 errata-xmlrpc 2014-10-14 04:11:10 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

Comment 10 errata-xmlrpc 2015-03-05 05:01:14 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0439 https://rhn.redhat.com/errata/RHSA-2015-0439.html

Note You need to log in before you can comment on or make changes to this bug.