Subject: [ASA-201901-15] haproxy: denial of service

Arch Linux Security Advisory ASA-201901-15
==========================================

Severity: Medium
Date    : 2019-01-24
CVE-ID  : CVE-2018-20102 CVE-2018-20103
Package : haproxy
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-836

Summary
=======

The package haproxy before version 1.9.0-1 is vulnerable to denial of
service.

Resolution
==========

Upgrade to 1.9.0-1.

# pacman -Syu "haproxy>=1.9.0-1"

The problems have been fixed upstream in version 1.9.0.

Workaround
==========

None.

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

- CVE-2018-20102 (denial of service)

A stack-based out-of-bounds read has been found in HAProxy before
1.8.15, in the dns_validate_dns_response() function in dns.c, where it
can be triggered by a crafted DNS packet.

- CVE-2018-20103 (denial of service)

A stack-exhaustion issue has been found in HAProxy before 1.8.15, in
the dns_read_name() function in dns.c, where an infinite recursion can
be triggered via a crafted DNS packet.

Impact
======

A remote attacker is able to crash the server with a specially crafted
DNS packet.

References
==========

https://www.mail-archive.com/haproxy@formilux.org/msg32055.html
https://git.haproxy.org/?p=haproxy-1.8.git;a=commitdiff;h=2e53fe850be462dab2c1141f044a94d248d68bfe
https://git.haproxy.org/?p=haproxy-1.8.git;a=commitdiff;h=12e27845513f87fe2df88e5795d0273f0b992a91
https://git.haproxy.org/?p=haproxy-1.8.git;a=commitdiff;h=2b514b24f71af8ff8c6593636850b9a312a05278
https://security.archlinux.org/CVE-2018-20102
https://security.archlinux.org/CVE-2018-20103