Vulnerability CVE-2013-2175
Published: 2013-08-19   Modified: 2013-08-20

Description:
HAProxy 1.4 before 1.4.24 and 1.5 before 1.5-dev19, when configured to use hdr_ip or other "hdr_*" functions with a negative occurrence count, allows remote attackers to cause a denial of service (negative array index usage and crash) via an HTTP header with a certain number of values, related to the MAX_HDR_HISTORY variable.

See advisories in our WLB2 database:
Topic
Author
Date
Med.
haproxy DoS when using header occurrences relative to the tail
David Torgerson
18.06.2013

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Redhat -> Enterprise linux load balancer 
Haproxy -> Haproxy 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
http://marc.info/?l=haproxy&m=137147915029705&w=2
http://rhn.redhat.com/errata/RHSA-2013-1120.html
http://rhn.redhat.com/errata/RHSA-2013-1204.html
http://www.debian.org/security/2013/dsa-2711
http://www.ubuntu.com/usn/USN-1889-1
https://bugzilla.redhat.com/show_bug.cgi?id=974259
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