Bug 1207192 – CVE-2015-2806 libtasn1: stack overflow in asn1_der_decoding

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Bug 1207192 - (CVE-2015-2806) CVE-2015-2806 libtasn1: stack overflow in asn1_der_decoding

Summary:	CVE-2015-2806 libtasn1: stack overflow in asn1_der_decoding

Status:	NEW

Aliases:	CVE-2015-2806

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	low Severity low
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=low,public=20150326,reported=2...
Keywords:	Security

Depends On:	1207193 1207194 1207195 1421361
Blocks:	1207196
	Show dependency tree / graph

Reported:	2015-03-30 08:13 EDT by Vasyl Kaigorodov
Modified:	2018-07-18 10:37 EDT (History)
CC List:	17 users (show)

See Also:
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:	---
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Environment:
Last Closed:
Type:	---
Regression:	---
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Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2017:1860	normal	SHIPPED_LIVE	Moderate: libtasn1 security, bug fix, and enhancement update	2017-08-01 13:50:00 EDT

Groups: None (edit)

Description Vasyl Kaigorodov 2015-03-30 08:13:01 EDT

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 08:14:08 EDT

Created libtasn1 tracking bugs for this issue:

Affects: fedora-all [bug 1207193]

Comment 2 Vasyl Kaigorodov 2015-03-30 08:14:12 EDT

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 05:37:57 EDT

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 05:47:33 EDT

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 14:43:50 EDT

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 14:57:46 EDT

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 15:12:36 EDT

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 15:16:09 EDT

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 00:39:26 EDT

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 11:09:40 EDT

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

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