[arch-security] [ASA-201609-30] openssl: denial of service

[Levente Polyak]

Arch Linux Security Advisory ASA-201609-30
==========================================

Severity: Medium
Date    : 2016-09-28
CVE-ID  : CVE-2016-7052
Package : openssl
Type    : denial of service
Remote  : Yes
Link    : https://wiki.archlinux.org/index.php/CVE

Summary
=======

The package openssl before version 1.0.2.j-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 1.0.2.j-1.

# pacman -Syu "openssl>=1.0.2.j-1"

The problem has been fixed upstream in version 1.0.2.j.

Workaround
==========

None.

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

A bug fix which included a CRL sanity check was added to OpenSSL 1.1.0
but was omitted from OpenSSL 1.0.2i. As a result any attempt to use
CRLs in OpenSSL 1.0.2i will crash with a null pointer exception.
The issue was reported to OpenSSL on 22nd September 2016 by Bruce
Stephens and Thomas Jakobi.

Impact
======

A remote attacker is able to perform a denial of service attack by
using a certificate revocation list.

References
==========

https://www.openssl.org/news/secadv/20160926.txt
https://access.redhat.com/security/cve/CVE-2016-7052

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