[arch-security] [ASA-201706-3] libtasn1: arbitrary code execution

[Remi Gacogne]

Arch Linux Security Advisory ASA-201706-3
=========================================

Severity: High
Date    : 2017-06-02
CVE-ID  : CVE-2017-6891
Package : libtasn1
Type    : arbitrary code execution
Remote  : Yes
Link    : https://security.archlinux.org/AVG-285

Summary
=======

The package libtasn1 before version 4.11-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 4.11-1.

# pacman -Syu "libtasn1>=4.11-1"

The problem has been fixed upstream in version 4.11.

Workaround
==========

None.

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

Two errors in the "asn1_find_node()" function (lib/parser_aux.c) within
GnuTLS libtasn1 version 4.10 can be exploited to cause a stacked-based
buffer overflow by tricking a user into processing a specially crafted
assignments file via the e.g. asn1Coding utility.

Impact
======

A remote attacker can execute arbitrary code on the affected host by
tricking a local user into processing a specially crafted assignments
file.

References
==========

https://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commitdiff;h=5520704d075802df25ce4ffccc010ba1641bd484
https://secuniaresearch.flexerasoftware.com/secunia_research/2017-11/
https://security.archlinux.org/CVE-2017-6891

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