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Category:   Application (Web Server/CGI)  >   Apache mod_proxy Vendors:   Apache Software Foundation
(Red Hat Issues Fix) Apache mod_proxy stream_reqbody_cl() Infinite Loop Lets Remote Users Deny Service
SecurityTracker Alert ID:  1022531
SecurityTracker URL:  http://securitytracker.com/id/1022531
CVE Reference:   CVE-2009-1890   (Links to External Site)
Date:  Jul 9 2009
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Apache mod_proxy. A remote user can cause denial of service conditions.

A remote user can send specially crafted Content-Length value to cause the stream_reqbody_cl() function in 'modules/proxy/mod_proxy_http.c' to enter an infinite loop.

Impact:   A remote user can cause the target service to enter an infinite loop.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-1148.html

Vendor URL:  www.apache.org/ (Links to External Site)
Cause:   State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Jul 3 2009 Apache mod_proxy stream_reqbody_cl() Infinite Loop Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2009:1148-01] Important: httpd security update


-----BEGIN PGP SIGNED MESSAGE-----
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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: httpd security update
Advisory ID:       RHSA-2009:1148-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-1148.html
Issue date:        2009-07-09
CVE Names:         CVE-2009-1890 CVE-2009-1891 
=====================================================================

1. Summary:

Updated httpd packages that fix two security issues are now available for
Red Hat Enterprise Linux 5.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Description:

The Apache HTTP Server is a popular Web server.

A denial of service flaw was found in the Apache mod_proxy module when it
was used as a reverse proxy. A remote attacker could use this flaw to force
a proxy process to consume large amounts of CPU time. (CVE-2009-1890)

A denial of service flaw was found in the Apache mod_deflate module. This
module continued to compress large files until compression was complete,
even if the network connection that requested the content was closed before
compression completed. This would cause mod_deflate to consume large
amounts of CPU if mod_deflate was enabled for a large file. (CVE-2009-1891)

All httpd users should upgrade to these updated packages, which contain
backported patches to correct these issues. After installing the updated
packages, the httpd daemon must be restarted for the update to take effect.

4. Solution:

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

This update is available via Red Hat Network.  Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

5. Bugs fixed (http://bugzilla.redhat.com/):

509125 - CVE-2009-1891 httpd: possible temporary DoS (CPU consumption) in mod_deflate
509375 - CVE-2009-1890 httpd: mod_proxy reverse proxy DoS (infinite loop)

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/httpd-2.2.3-22.el5_3.2.src.rpm

i386:
httpd-2.2.3-22.el5_3.2.i386.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm
mod_ssl-2.2.3-22.el5_3.2.i386.rpm

x86_64:
httpd-2.2.3-22.el5_3.2.x86_64.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.x86_64.rpm
mod_ssl-2.2.3-22.el5_3.2.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/httpd-2.2.3-22.el5_3.2.src.rpm

i386:
httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm
httpd-devel-2.2.3-22.el5_3.2.i386.rpm
httpd-manual-2.2.3-22.el5_3.2.i386.rpm

x86_64:
httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.x86_64.rpm
httpd-devel-2.2.3-22.el5_3.2.i386.rpm
httpd-devel-2.2.3-22.el5_3.2.x86_64.rpm
httpd-manual-2.2.3-22.el5_3.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/httpd-2.2.3-22.el5_3.2.src.rpm

i386:
httpd-2.2.3-22.el5_3.2.i386.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm
httpd-devel-2.2.3-22.el5_3.2.i386.rpm
httpd-manual-2.2.3-22.el5_3.2.i386.rpm
mod_ssl-2.2.3-22.el5_3.2.i386.rpm

ia64:
httpd-2.2.3-22.el5_3.2.ia64.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.ia64.rpm
httpd-devel-2.2.3-22.el5_3.2.ia64.rpm
httpd-manual-2.2.3-22.el5_3.2.ia64.rpm
mod_ssl-2.2.3-22.el5_3.2.ia64.rpm

ppc:
httpd-2.2.3-22.el5_3.2.ppc.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.ppc.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.ppc64.rpm
httpd-devel-2.2.3-22.el5_3.2.ppc.rpm
httpd-devel-2.2.3-22.el5_3.2.ppc64.rpm
httpd-manual-2.2.3-22.el5_3.2.ppc.rpm
mod_ssl-2.2.3-22.el5_3.2.ppc.rpm

s390x:
httpd-2.2.3-22.el5_3.2.s390x.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.s390.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.s390x.rpm
httpd-devel-2.2.3-22.el5_3.2.s390.rpm
httpd-devel-2.2.3-22.el5_3.2.s390x.rpm
httpd-manual-2.2.3-22.el5_3.2.s390x.rpm
mod_ssl-2.2.3-22.el5_3.2.s390x.rpm

x86_64:
httpd-2.2.3-22.el5_3.2.x86_64.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.i386.rpm
httpd-debuginfo-2.2.3-22.el5_3.2.x86_64.rpm
httpd-devel-2.2.3-22.el5_3.2.i386.rpm
httpd-devel-2.2.3-22.el5_3.2.x86_64.rpm
httpd-manual-2.2.3-22.el5_3.2.x86_64.rpm
mod_ssl-2.2.3-22.el5_3.2.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1890
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1891
http://www.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2009 Red Hat, Inc.
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