Bug 1302632 (CVE-2015-8630)

Summary:	CVE-2015-8630 krb5: krb5 doesn't check for null policy when KADM5_POLICY is set in the mask
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	abokovoy, csutherl, dknox, dpal, jclere, jdoyle, jplans, j, lgao, mbabacek, myarboro, nalin, npmccallum, pkis, rharwood, sardella, slawomir, twalsh, weli
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	krb5 1.14.1, krb5 1.13.4	Doc Type:	Bug Fix
Doc Text:	A NULL pointer dereference flaw was found in the procedure used by the MIT Kerberos kadmind service to store policies: the kadm5_create_principal_3() and kadm5_modify_principal() function did not ensure that a policy was given when KADM5_POLICY was set. An authenticated attacker with permissions to modify the database could use this flaw to add or modify a principal with a policy set to NULL, causing the kadmind service to crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-04-01 07:07:42 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1302633, 1306969, 1306970
Bug Blocks:	1302647

Description Adam Mariš 2016-01-28 10:12:51 UTC

It was reported that in MIT krb5 1.12 and later, an authenticated attacker with permission to modify a principal entry can cause kadmind to dereference a null pointer by supplying a null policy value but including KADM5_POLICY in the mask.

Upstream patch:

https://github.com/krb5/krb5/commit/b863de7fbf080b15e347a736fdda0a82d42f4f6b

Comment 1 Adam Mariš 2016-01-28 10:13:22 UTC

Created krb5 tracking bugs for this issue:

Affects: fedora-all [bug 1302633]

Comment 6 Tomas Hoger 2016-03-03 21:29:12 UTC

Upstream bug report:

http://krbdev.mit.edu/rt/Ticket/Display.html?id=8342

Fixed upstream in krb5 1.14.1:

http://web.mit.edu/kerberos/krb5-1.14/krb5-1.14.1.html

The upstream bug report also indicates the issue will be fixed in 1.13.4.

Comment 7 errata-xmlrpc 2016-03-31 22:03:34 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:0532 https://rhn.redhat.com/errata/RHSA-2016-0532.html