RHSA-2013:0868 - 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 buffer overflow flaw was found in the way HAProxy handled pipelined HTTP
requests. A remote attacker could send pipelined HTTP requests that would
cause HAProxy to crash or, potentially, execute arbitrary code with the
privileges of the user running HAProxy. This issue only affected systems
using all of the following combined configuration options: HTTP keep alive
enabled, HTTP keywords in TCP inspection rules, and request appending
rules. (CVE-2013-1912)

Red Hat would like to thank Willy Tarreau of HAProxy upstream for reporting
this issue. Upstream acknowledges Yves Lafon from the W3C 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/knowledge/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 - 947581 - CVE-2013-1912 haproxy: rewrite rules flaw can lead to arbitrary code execution

CVEs

• CVE-2013-1912

References

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