[arch-security] [ASA-201605-17] libksba: denial of service

[Remi Gacogne]

Arch Linux Security Advisory ASA-201605-17
==========================================

Severity: Medium
Date    : 2016-05-12
CVE-ID  : CVE-2016-4574
Package : libksba
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package libksba before version 1.3.4-1 is vulnerable to denial of
service or other unspecified impact.

Resolution
==========

Upgrade to 1.3.4-1.

# pacman -Syu "libksba>=1.3.4-1"

The problem has been fixed upstream in version 1.3.4.

Workaround
==========

None.

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

An out-of-bound read access due to incorrect utf-8 strings handling has
been in found in the _ksba_dn_to_str() function.
This issue is due to an incomplete fix for CVE-2016-4356, caused by an
off-by-one error when handling incorrect utf-8 strings.

Impact
======

A remote attacker might be able to crash the application using libksba,
causing a denial of service, or have other unspecified impact.

References
==========

https://bugs.archlinux.org/task/49289
http://www.openwall.com/lists/oss-security/2016/05/10/4
https://access.redhat.com/security/cve/CVE-2016-4574

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