Bug 1325965 (CVE-2016-4008)

Summary:	CVE-2016-4008 libtasn1: infinite loop while parsing DER certificates
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	alonbl, bmcclain, carnil, cfergeau, dblechte, eedri, erik-fedora, gklein, klember, lsurette, mgoldboi, michal.skrivanek, nmavrogi, rbalakri, rh-spice-bugs, sardella, sherold, slawomir, srevivo, tmraz, ykaul, ylavi
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libtasn1 4.8	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-05-09 08:35:33 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:	1325968, 1325969, 1325970
Bug Blocks:	1325972

Description Andrej Nemec 2016-04-11 13:49:46 UTC

The libtasn1 library, in its 4.7 version, can loop for a long time or indefinitely when it is used to parse DER representations of X509 certificates, leading to a denial of service. Some of these loops may in addition increase heap or stack usage, leading to more issues.

References (with reproducer):

http://seclists.org/oss-sec/2016/q2/51

Comment 1 Andrej Nemec 2016-04-11 13:51:19 UTC

Created libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1325968]

Comment 2 Andrej Nemec 2016-04-11 13:51:32 UTC

Created mingw-libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1325969]
Affects: epel-7 [bug 1325970]

Comment 3 Andrej Nemec 2016-04-13 14:26:17 UTC

CVE assignment:

http://seclists.org/oss-sec/2016/q2/66

Comment 4 Fedora Update System 2016-04-15 03:18:02 UTC

libtasn1-4.8-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-04-22 01:24:53 UTC

libtasn1-4.8-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2016-04-27 22:20:51 UTC

libtasn1-4.8-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Huzaifa S. Sidhpurwala 2016-05-09 06:57:31 UTC

Upstream commit:

http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commit;h=f435825c0f527a8e52e6ffbc3ad0bc60531d537e