Bug 1753589 (CVE-2019-14844)

Summary:	CVE-2019-14844 krb5: reversed strlcpy() allows client to crash the KDC
Product:	[Other] Security Response	Reporter:	msiddiqu
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	abokovoy, csutherl, dblechte, dfediuck, dpal, eedri, gzaronik, jclere, jplans, j, lgao, mbabacek, mgoldboi, michal.skrivanek, mturk, myarboro, nalin, npmccallum, pkis, rharwood, sbonazzo, sbose, security-response-team, sherold, ssorce, twalsh, weli, yturgema
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A flaw was found in the way a Kerberos client could crash the KDC by sending one of the RFC 4556 "enctypes". A remote unauthenticated user could use this flaw to crash the KDC.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-20 06:51:12 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:	1754369
Bug Blocks:	1753106

Description msiddiqu 2019-09-19 11:19:57 UTC

A client can crash the KDC in enctype_name() by sendingone of the RFC 4556 enctypes, because of reversed strlcpy() arguments atthe end of enctype_name()

References:   

https://bugzilla.redhat.com/show_bug.cgi?id=1664157

Comment 1 Huzaifa S. Sidhpurwala 2019-09-23 05:27:02 UTC

This issue is caused by backporting commits due to the following bug: https://bugzilla.redhat.com/show_bug.cgi?id=1664157

Comment 5 Huzaifa S. Sidhpurwala 2019-09-26 03:55:09 UTC

External References:

https://github.com/krb5/krb5/pull/981

Comment 6 Huzaifa S. Sidhpurwala 2019-09-26 03:59:07 UTC

Note:

This flaw was introduced in upstream commit: https://github.com/krb5/krb5/commit/a649279727490687d54becad91fde8cf7429d951 and fixed via https://github.com/krb5/krb5/pull/981/commits/275c9a1aad36a1a7b56042f1a2c21c33e7d16eaf

This flaw does not affect any MIT krb5 upstream releases. Fedora versions of MIT krb5 are affected and fixed via the following updates:

https://bodhi.fedoraproject.org/updates/FEDORA-2019-f939e79e24
https://bodhi.fedoraproject.org/updates/FEDORA-2019-2323661e5f
https://bodhi.fedoraproject.org/updates/FEDORA-2019-320a5a6a68
https://bodhi.fedoraproject.org/updates/FEDORA-2019-dc4e1d0fb6

Comment 7 Huzaifa S. Sidhpurwala 2019-09-26 03:59:13 UTC

Statement:

This flaw affects the krb5 server only; client-side packages are not affected. This flaw does not affect any krb5 packages shipped with Red Hat products.

Comment 8 Product Security DevOps Team 2019-11-20 06:51:12 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-14844