[arch-security] [ASA-201604-9] libtasn1: denial of service

[Remi Gacogne]

Arch Linux Security Advisory ASA-201604-9
=========================================

Severity: Medium
Date    : 2016-04-17
CVE-ID  : CVE-2016-4008
Package : libtasn1
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package libtasn1 before version 4.8-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 4.8-1.

# pacman -Syu "libtasn1>=4.8-1"

The problem has been fixed upstream in version 4.8.

Workaround
==========

None.

Description
===========

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 X.509
certificates, leading to a denial of service. Some of these loops may in
addition increase heap or stack usage, leading to more issues.

Impact
======

A remote attacker can cause an application using a vulnerable version of
libtasn1 to loop indefinitely by sending a crafted X.509 certificate,
causing a denial of service.

References
==========

http://article.gmane.org/gmane.comp.security.oss.general/19286
https://access.redhat.com/security/cve/CVE-2016-4008
https://bugzilla.redhat.com/show_bug.cgi?id=1325965

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