Bug 1218141 (CVE-2015-3622)

Summary:	CVE-2015-3622 libtasn1: heap overflow flaw in _asn1_extract_der_octet()
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	acathrow, bmcclain, carnil, cfergeau, dblechte, erik-fedora, idith, jshort, kalevlember, lsurette, michal.skrivanek, nmavrogi, rh-spice-bugs, slawomir, srevivo, tmraz, ykaul, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libtasn1 4.5	Doc Type:	Bug Fix
Doc Text:	A heap-based buffer overflow flaw was found in the way the libtasn1 library decoded certain DER-encoded inputs. A specially crafted DER-encoded input could cause an application using libtasn1 to perform an invalid read, causing the application to crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:41:03 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:	1218142, 1218143, 1218144, 1421361
Bug Blocks:	1218146

Description Martin Prpič 2015-05-04 09:32:28 UTC

A heap-based buffer overflow flaw was found in the way the libtasn1 library decoded certain DER-encoded input. A specially crafted, DER-encoded input could cause an application using libtasn1 to perform an invalid read, causing the application to crash.

Upstream patch:

http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commitdiff;h=f979435823a02f842c41d49cd41cc81f25b5d677

Comment 1 Martin Prpič 2015-05-04 09:33:58 UTC

Reproducer:

https://crashes.fuzzing-project.org/TFPA-2015-005-libtasn1-4.4-heap-overflow.crt

Sample malformed certificate exposing heap overflow (test with certtool -i --inder --infile=[sample] and address sanitizer or valgrind)

Comment 2 Martin Prpič 2015-05-04 09:34:45 UTC

Created libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1218142]

Comment 3 Martin Prpič 2015-05-04 09:34:49 UTC

Created mingw-libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1218143]
Affects: epel-7 [bug 1218144]

Comment 5 Fedora Update System 2015-05-19 16:20:45 UTC

libtasn1-4.5-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Huzaifa S. Sidhpurwala 2015-06-02 04:58:43 UTC

Statement:

Red Hat Product Security has rated this issue as having moderate security impact, a future update may address this flaw in the libtasn1 packages.

Comment 12 errata-xmlrpc 2017-08-01 15:09:53 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1860 https://access.redhat.com/errata/RHSA-2017:1860