RHSA-2013:1120 - Security Advisory

Topic

An updated haproxy package that fixes one security issue is now available
for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having moderate
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

Description

HAProxy provides high availability, load balancing, and proxying for TCP
and HTTP-based applications.

A flaw was found in the way HAProxy handled requests when the proxy's
configuration ("/etc/haproxy/haproxy.cfg") had certain rules that use the
hdr_ip criterion. A remote attacker could use this flaw to crash HAProxy
instances that use the affected configuration. (CVE-2013-2175)

Red Hat would like to thank HAProxy upstream for reporting this issue.
Upstream acknowledges David Torgerson as the original reporter.

HAProxy is released as a Technology Preview in Red Hat Enterprise Linux 6.
More information about Red Hat Technology Previews is available at
https://access.redhat.com/support/offerings/techpreview/

All users of haproxy are advised to upgrade to this updated package, which
contains a backported patch to correct this issue.

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/site/articles/11258

Affected Products

• Red Hat Enterprise Linux Load Balancer (for RHEL Server) 6 x86_64
• Red Hat Enterprise Linux Load Balancer (for RHEL Server) 6 i386
• Red Hat Enterprise Linux Load Balancer (for RHEL Server) - Extended Update Support 6.4 x86_64
• Red Hat Enterprise Linux Load Balancer (for RHEL Server) - Extended Update Support 6.4 i386
• Red Hat Enterprise Linux Load Balancer (for RHEL Server) from RHUI 6 x86_64
• Red Hat Enterprise Linux Load Balancer (for RHEL Server) from RHUI 6 i386
• Red Hat Enterprise Linux Load Balancer (for RHEL Server) - AUS 6.4 x86_64

Fixes

• BZ - 974259 - CVE-2013-2175 haproxy: http_get_hdr()/get_ip_from_hdr2() MAX_HDR_HISTORY handling denial of service

CVEs

• CVE-2013-2175

References

• https://access.redhat.com/security/updates/classification/#moderate
• https://access.redhat.com/support/offerings/techpreview/