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             AUSCERT External Security Bulletin Redistribution

                     ESB-2002.301 -- RHSA-2002:118-06
           Stronghold:  Chunked encoding vulnerability in Apache
                               21 June 2002

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                Stronghold Apache
Vendor:                 Red Hat
Operating System:       Red Hat Linux
                        Linux
                        UNIX
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote

Ref:                    AA-2002.04
                        ESB-2002.285
                        ESB-2002.293

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                   Red Hat, Inc. Red Hat Security Advisory

Synopsis:          Stronghold: Chunked encoding vulnerability in Apache
Advisory ID:       RHSA-2002:118-06
Issue date:        2002-06-20
Updated on:        2002-06-20
Product:           Stronghold Cross Platform
Keywords:          apache chunked encoding DoS
Cross references:  
Obsoletes:         
CVE Names:         CAN-2002-0392
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1. Topic:

The Apache Web server contains a security vulnerability which can be used
to launch a denial of service attack, or in some cases, allow remote code
execution.

2. Relevant releases/architectures:



3. Problem description:

Versions of the Apache Web server up to and including 1.3.24 contain a bug
in the routines which deal with requests encoded using "chunked" encoding.
A carefully crafted invalid request can cause an Apache child process to
call the memcpy() function in a way that will write past the end of its
buffer, corrupting the stack.

The Common Vulnerabilities and Exposures project (cve.mitre.org) has
assigned the name CAN-2002-0392 to this issue.

Due to the nature of the overflow on 32-bit Unix platforms this will most
likely cause a segmentation violation and the child will terminate. 
However on some 64-bit platforms and some 32-bit platforms it is likely
that it is further exploitable. This could allow arbitrary code to be run
on the server as the user the Apache children are set to run as.

All users of Stronghold are advised to patch or upgrade their servers

4. Solution:

We have backported the security fix from the official Apache 1.3.26
release.  The patch and instructions on how to apply it are available 
from the Stronghold resource center at http://stronghold.redhat.com/

Stronghold 3: http://stronghold.redhat.com/sh3/errata-2002-118

Stronghold 4: http://stronghold.redhat.com/sh4/errata-2002-118 

Updated packages will also be made available shortly from the same URLs

5. Bug IDs fixed (http://bugzilla.redhat.com/bugzilla for more info):



6. RPMs required:



7. Verification:

MD5 sum                          Package Name
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These packages are GPG signed by Red Hat, Inc. for security.  Our key
is available at:
    http://www.redhat.com/about/contact/pgpkey.html

You can verify each package with the following command:
    rpm --checksig  <filename>

If you only wish to verify that each package has not been corrupted or
tampered with, examine only the md5sum with the following command:
    rpm --checksig --nogpg <filename>

8. References:

http://httpd.apache.org/info/security_bulletin_20020617.txt
http://stronghold.redhat.com/sh3/errata-2002-118
http://stronghold.redhat.com/sh4/errata-2002-118
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2002-0392



Copyright(c) 2000, 2001, 2002 Red Hat, Inc.



_______________________________________________

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