Bug 1120581 – CVE-2014-4342 krb5: denial of service flaws when handling RFC 1964 tokens

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Bug 1120581 - (CVE-2014-4342) CVE-2014-4342 krb5: denial of service flaws when handling RFC 1964 tokens

Summary:	CVE-2014-4342 krb5: denial of service flaws when handling RFC 1964 tokens

Status:	CLOSED ERRATA

Aliases:	CVE-2014-4342

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=20140626,reported=2...
Keywords:	Security

Depends On:	1121510 1121511
Blocks:	1101912 1116197 1121513
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Reported:	2014-07-17 04:34 EDT by Huzaifa S. Sidhpurwala
Modified:	2015-03-06 05:08 EST (History)
CC List:	8 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	A buffer over-read flaw was found in the way MIT Kerberos handled certain requests. A remote, unauthenticated attacker who is able to inject packets into a client or server application's GSSAPI session could use this flaw to crash the application.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2015-03-06 05:08:32 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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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 Huzaifa S. Sidhpurwala 2014-07-17 04:34:49 EDT

In MIT krb5 releases krb5-1.7 and later, an unauthenticated remote attacker with the ability to inject packets into a legitimately established GSSAPI application session can cause a program crash due to invalid memory references when reading beyond the end of a buffer or by causing a null pointer dereference.

References:

http://diswww.mit.edu:8008/menelaus.mit.edu/cvs-krb5/28388
https://github.com/krb5/krb5/commit/fb99962cbd063ac04c9a9d2cc7c75eab73f3533d

Comment 1 Siddharth Sharma 2014-07-17 05:35:23 EDT

A remote unauthenticated attacker is able to send a specially crafted packet to crash a Kerberos server. The kg_unseal_v1 and kg_unseal_v1_iov functions in GSSAPI are reachable externally, and do not handle issues like handling of invalid RFC 1964 tokens and checking for header length less than 22 bytes. CVE-2014-4342 affects MIT krb5 releases krb5-1.7 and later.

Comment 2 Siddharth Sharma 2014-07-17 06:20:10 EDT

Statement:

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

Comment 4 Martin Prpič 2014-10-08 04:39:14 EDT

IssueDescription:

A buffer over-read flaw was found in the way MIT Kerberos handled certain requests. A remote, unauthenticated attacker who is able to inject packets into a client or server application's GSSAPI session could use this flaw to crash the application.

Comment 5 errata-xmlrpc 2014-10-14 04:10:59 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 6 errata-xmlrpc 2015-03-05 05:01:03 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

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