Subject: [ASA-201707-21] c-ares: information disclosure

Arch Linux Security Advisory ASA-201707-21
==========================================

Severity: Medium
Date    : 2017-07-18
CVE-ID  : CVE-2017-1000381
Package : c-ares
Type    : information disclosure
Remote  : Yes
Link    : https://security.archlinux.org/AVG-315

Summary
=======

The package c-ares before version 1.13.0-1 is vulnerable to information
disclosure.

Resolution
==========

Upgrade to 1.13.0-1.

# pacman -Syu "c-ares>=1.13.0-1"

The problem has been fixed upstream in version 1.13.0.

Workaround
==========

None.

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

A out-of-bounds read has been found in c-ares < 1.13.0. The
ares_parse_naptr_reply() function, which is used for parsing NAPTR
responses, could be triggered to read memory outside of the given input
buffer if the passed in DNS response packet was crafted in a particular
way.

Impact
======

A remote attacker might be able to access sensitive information by
responding to a DNS query with a crafted response packet.

References
==========

https://c-ares.haxx.se/adv_20170620.html
https://security.archlinux.org/CVE-2017-1000381