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Category:   Application (Web Server/CGI)  >   Apache HTTPD Vendors:   Apache Software Foundation
(Red Hat Issues Fix) Apache Buffer Overflow in mod_proxy_fcgi Lets Remote Users Deny Service
SecurityTracker Alert ID:  1033727
SecurityTracker URL:
CVE Reference:   CVE-2014-3583   (Links to External Site)
Date:  Oct 2 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.4.10; possibly earlier versions
Description:   A vulnerability was reported in Apache mod_proxy_fcgi. A remote user can cause denial of service conditions.

A remote FastCGI server can return specially crafted response headers to trigger a buffer overflow in handle_headers() function in 'mod_proxy_fcgi.c' and cause the target Apache server to crash.

Impact:   A remote user can cause the target server to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

Vendor URL: (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Dec 15 2014 Apache Buffer Overflow in mod_proxy_fcgi Lets Remote Users Deny Service

 Source Message Contents

Subject:  [RHSA-2015:1855-01] Low: mod_proxy_fcgi security update

Hash: SHA1

                   Red Hat Security Advisory

Synopsis:          Low: mod_proxy_fcgi security update
Advisory ID:       RHSA-2015:1855-01
Product:           Red Hat Common
Advisory URL:
Issue date:        2015-10-01
CVE Names:         CVE-2014-3583 

1. Summary:

An updated mod_proxy_fcgi package that fixes one security issue is now
available for Red Hat Ceph Storage 1.2 for Red Hat Enterprise Linux 6.

Red Hat Product Security has rated this update as having Low 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.

2. Relevant releases/architectures:

Red Hat Common for RHEL Server (v. 6) - x86_64

3. Description:

Red Hat Ceph Storage is a massively scalable, open, software-defined
storage platform that combines the most stable version of the Ceph storage
system with a Ceph management platform, deployment tools, and support

The mod_proxy_fcgi package provides a proxy module for the Apache 2.2 HTTP

A buffer overflow flaw was found in mod_proxy_fcgi's handle_headers()
function. A malicious FastCGI server that httpd is configured to connect to
could send a carefully crafted response that would cause an httpd child
process handling the request to crash. (CVE-2014-3583)

All mod_proxy_fcgi users are advised to upgrade to this updated package,
which corrects this issue.

4. Solution:

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

For details on how to apply this update, refer to:

5. Bugs fixed (

1163555 - CVE-2014-3583 httpd: mod_proxy_fcgi handle_headers() buffer over read

6. Package List:

Red Hat Common for RHEL Server (v. 6):



These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from

7. References:

8. Contact:

The Red Hat security contact is <>. More contact
details at

Copyright 2015 Red Hat, Inc.
Version: GnuPG v1


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