[arch-security] [ASA-201505-5] libtasn1: arbitrary code execution

[Levente Polyak]

Arch Linux Security Advisory ASA-201505-5
=========================================

Severity: Critical
Date    : 2015-05-08
CVE-ID  : CVE-2015-3622
Package : libtasn1
Type    : arbitrary code execution
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package libtasn1 before version 4.5-1 is vulnerable to arbitrary
code execution.

Resolution
==========

Upgrade to 4.5-1.

# pacman -Syu "libtasn1>=4.5-1"

The problem has been fixed upstream in version 4.5.

Workaround
==========

None.

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

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 or, possibly, execute
arbitrary code.
The heap overflow happens in the function _asn1_extract_der_octet() that
is called during decoding of DER-encoded input.

Impact
======

A remote attacker is able to use a specially crafted certificate that is
leading to arbitrary code execution during decoding.

References
==========

http://git.savannah.gnu.org/gitweb/?p=libtasn1.git;a=commitdiff;h=f979435
https://access.redhat.com/security/cve/CVE-2015-3622

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