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Red Hat Linux Advisory: httpd

Sep 05, 2003, 02:29 (0 Talkback[s])

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Red Hat Security Advisory

Synopsis: Updated httpd packages fix Apache security vulnerabilities
Advisory ID: RHSA-2003:240-01
Issue date: 2003-09-04
Updated on: 2003-09-04
Product: Red Hat Linux
Keywords: Apache httpd ASF APR
Cross references:  
CVE Names: CAN-2003-0192 CAN-2003-0253 CAN-2003-0254

1. Topic:

Updated httpd packages that fix several minor security issues are now available for Red Hat Linux 8.0 and 9.

2. Relevant releases/architectures:

Red Hat Linux 8.0 - i386
Red Hat Linux 9 - i386

3. Problem description:

The Apache HTTP server is a powerful, full-featured, efficient, and freely-available Web server.

Ben Laurie found a bug in the optional renegotiation code in mod_ssl included with Apache 2 versions 2.0.35 through 2.0.46 that can cause cipher suite restrictions to be ignored. This is triggered if optional renegotiation is used (SSLOptions +OptRenegotiate) along with verification of client certificates and a change to the cipher suite over the renegotiation. The Common Vulnerabilities and Exposures project ( has assigned the name CAN-2003-0192 to this issue.

Yoshioka Tsuneo found that unpatched versions of Apache 2 versions 2.0.35 to 2.0.46 have a bug that can cause a remote Denial of Service. When a client requests that proxy ftp connect to a ftp server with an IPv6 address, and the proxy is unable to create an IPv6 socket, an infinite loop occurs. The Common Vulnerabilities and Exposures project has assigned the name CAN-2003-0254 to this issue.

Saheed Akhtar found that unpatched Apache 2 versions 2.0.35 through 2.0.46 have a bug in the prefork MPM when handling accept errors. In a server with multiple listening sockets, a certain error returned by accept() on a rarely-accessed port can cause a temporary denial of service. The Common Vulnerabilities and Exposures project has assigned the name CAN-2003-0253 to this issue.

It is possible for Apache 2 to get into an infinite loop handling internal redirects and nested subrequests. A patch for this issue adds the new LimitInternalRecursion directive.

All users of the Apache HTTP Web Server are advised to upgrade to the applicable errata packages, which contain back-ported fixes correcting these issues, and are applied to Apache version 2.0.40.

After the errata packages are installed, restart the Web service by running (as root) the following command:

/sbin/service httpd restart

4. Solution:

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

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those RPMs which are currently installed will be updated. Those RPMs which are not installed but included in the list will not be updated. Note that you can also use wildcards (*.rpm) if your current directory only contains the desired RPMs.

Please note that this update is also available via Red Hat Network. Many people find this an easier way to apply updates. To use Red Hat Network, launch the Red Hat Update Agent with the following command:


This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL Certificate Errors, you need to install a version of the up2date client with an updated certificate. The latest version of up2date is available from the Red Hat FTP site and may also be downloaded directly from the RHN website:

5. Bug IDs fixed ( for more info):

78019 - mod_ssl won't start up after unclean shutdown
82985 - Content-length miscalculated when using ssi include virtual with wrapped cgi
85022 - Apache fails to start: Cannot create SSLMutex file
97111 - httpd insists on always calculating Content-Length from CGI output.
98545 - Handle errors when starting piped logged processes
98653 - Mod_rewite prg maps out of sync
98852 - CAN-2003-0192: mod_ssl renegotiation issue
98853 - CAN-2003-0253: remote denial of service against prefork MPM
98855 - CAN-2003-0254: remote denial of service by hostile DNS

6. RPMs required:

Updated httpd packages that fix several minor security issues are now available for Red Hat Linux 8.0 and 9. Red Hat Linux 8.0:



Red Hat Linux 9:



7. Verification:

MD5 sum Package Name

6f080385d9b18ef94b5ee68437ae49ce 8.0/en/os/SRPMS/httpd-2.0.40-11.7.src.rpm
bcab37228a183cae291e8a27ab805c61 8.0/en/os/i386/httpd-2.0.40-11.7.i386.rpm
48594394b3c5e197a8f2b51fbd74c2c9 8.0/en/os/i386/httpd-devel-2.0.40-11.7.i386.rpm
befbdb0fe7258073ab8c532e74387606 8.0/en/os/i386/httpd-manual-2.0.40-11.7.i386.rpm
f1e470ca6b9adc49d36eac3f795fd1f7 8.0/en/os/i386/mod_ssl-2.0.40-11.7.i386.rpm
f4c307bb824fee18525d510dc1db020d 9/en/os/SRPMS/httpd-2.0.40-21.5.src.rpm
92c7244515d95038cf2e04d87f686faf 9/en/os/i386/httpd-2.0.40-21.5.i386.rpm
1f6cc3c816924ba884e3021b998e0dcc 9/en/os/i386/httpd-devel-2.0.40-21.5.i386.rpm
c008b9657f0c6ab03fec58703add8564 9/en/os/i386/httpd-manual-2.0.40-21.5.i386.rpm
5aaa060148c8f6dcda00953fa843a674 9/en/os/i386/mod_ssl-2.0.40-21.5.i386.rpm

These packages are GPG signed by Red Hat for security. Our key is available from

You can verify each package with the following command:

rpm --checksig -v <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:

md5sum <filename>

8. References:

9. Contact:

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

Copyright 2003 Red Hat, Inc.