Bug 1207192 (CVE-2015-2806)

Summary:	CVE-2015-2806 libtasn1: stack overflow in asn1_der_decoding
Product:	[Other] Security Response	Reporter:	Vasyl Kaigorodov <vkaigoro>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	acathrow, bmcclain, carnil, cfergeau, dblechte, erik-fedora, idith, kalevlember, lsurette, michal.skrivanek, nmavrogi, rh-spice-bugs, slawomir, srevivo, tmraz, ykaul
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	libtasn1 4.4	Doc Type:	Bug Fix
Doc Text:	A stack-based buffer overflow was found in the way libtasn1 decoded certain DER encoded data. An attacker could use this flaw to crash an application using the libtasn1 library.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:40:37 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:	1207193, 1207194, 1207195, 1421361
Bug Blocks:	1207196

Description Vasyl Kaigorodov 2015-03-30 12:13:01 UTC

From http://lists.gnu.org/archive/html/help-libtasn1/2015-03/msg00002.html:

GNU Libtasn1 is a standalone library written in C for manipulating ASN.1
objects including DER/BER encoding/decoding.  GNU Libtasn1 is used by
GnuTLS to handle X.509 structures and by GNU Shishi to handle Kerberos
V5 structures.

* Noteworthy changes in release 4.4 (released 2015-03-29) [stable]
- Corrected a two-byte stack overflow in asn1_der_decoding. Reported
  by Hanno Böck.

Exact commit that fixes this:
http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commit;h=4d4f992826a4962790ecd0cce6fbba4a415ce149

CVE request: http://seclists.org/oss-sec/2015/q1/1038

Comment 1 Vasyl Kaigorodov 2015-03-30 12:14:08 UTC

Created libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1207193]

Comment 2 Vasyl Kaigorodov 2015-03-30 12:14:12 UTC

Created mingw-libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1207194]
Affects: epel-all [bug 1207195]

Comment 3 Fedora Update System 2015-04-18 09:37:57 UTC

libtasn1-3.8-3.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2015-04-18 09:47:33 UTC

libtasn1-4.4-1.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2015-04-21 18:43:50 UTC

mingw-libtasn1-4.4-1.fc22, mingw-gnutls-3.3.14-1.fc22 has been pushed to the Fedora 22 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2015-04-21 18:57:46 UTC

libtasn1-4.4-1.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 Fedora Update System 2015-04-21 19:12:36 UTC

mingw-libtasn1-3.8-2.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2015-04-21 19:16:09 UTC

mingw-libtasn1-4.4-1.fc21, mingw-gnutls-3.3.14-1.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 04:39:26 UTC

Statement:

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

Comment 12 errata-xmlrpc 2017-08-01 15:09:40 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