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Category:   Application (Web Server/CGI)  >   Apache HTTPD Vendors:   Apache Software Foundation
(Red Hat Issues Fix for RH Linux) Apache mod_ssl Memory Leak Lets Remote Users Crash the Daemon
SecurityTracker Alert ID:  1009995
SecurityTracker URL:  http://securitytracker.com/id/1009995
CVE Reference:   CVE-2004-0113   (Links to External Site)
Date:  Apr 30 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 2.0.35 through 2.0.48
Description:   A vulnerability was reported in Apache mod_ssl. A remote user may be able to deny service.

It is reported that a remote user can send plain HTTP requests to the SSL port on an SSL-enabled Apache web server to cause denial of service conditions. The vulnerability is due to a memory leak in mod_ssl, the report said.

The flaw reportedly resides in the ssl_io_filter_disable() function in the 'ssl_engine_io.c' file.

Versions 2.0.35 through 2.0.48 are reportedly affected.

Mick Wall is credited with reporting this vulnerability.

Impact:   A remote user can cause the web service to crash.
Solution:   Red Hat has released a fix.

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/httpd-2.0.40-21.11.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/httpd-2.0.40-21.11.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/httpd-devel-2.0.40-21.11.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/httpd-manual-2.0.40-21.11.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mod_ssl-2.0.40-21.11.i386.rpm

The verification checksums are:

MD5 sum Package Name

d936dc84de88a6c60bdd180827cc06f7 9/en/os/SRPMS/httpd-2.0.40-21.11.src.rpm
9f900749436725ed2e3fe086e3a53cab 9/en/os/i386/httpd-2.0.40-21.11.i386.rpm
faf0eae15fd2a63a2ce2569b6dbab083 9/en/os/i386/httpd-devel-2.0.40-21.11.i386.rpm
4868bf7d599889349b1ba04dd4f589b4 9/en/os/i386/httpd-manual-2.0.40-21.11.i386.rpm
c286771938be54514c2eb568202574ad 9/en/os/i386/mod_ssl-2.0.40-21.11.i386.rpm

Vendor URL:  nagoya.apache.org/bugzilla/show_bug.cgi?id=27106 (Links to External Site)
Cause:   Resource error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  9

Message History:   This archive entry is a follow-up to the message listed below.
Mar 8 2004 Apache mod_ssl Memory Leak Lets Remote Users Crash the Daemon



 Source Message Contents

Subject:  [RHSA-2004:182-01] Updated httpd packages fix mod_ssl security issue


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated httpd packages fix mod_ssl security issue
Advisory ID:       RHSA-2004:182-01
Issue date:        2004-04-30
Updated on:        2004-04-30
Product:           Red Hat Linux
Keywords:          Apache httpd DoS SSL
Cross references:  
Obsoletes:         
CVE Names:         CAN-2004-0113
- ---------------------------------------------------------------------

1. Topic:

Updated httpd packages are now available that fix a denial of service
vulnerability in mod_ssl and include various other bug fixes.

2. Relevant releases/architectures:

Red Hat Linux 9 - i386

3. Problem description:

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

A memory leak in mod_ssl in the Apache HTTP Server prior to version 2.0.49
allows a remote denial of service attack against an SSL-enabled server. The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name CAN-2004-0113 to this issue.

Users of the Apache HTTP server should upgrade to these updated packages,
which contain backported patches that address these issues.

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:

up2date

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

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

78224 - Apache will not list/send files mounted from a NetWare volume.
115280 - deflate module is not working properly
116576 - Apache2 fails to start with more than 1024 FDs

6. RPMs required:

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/httpd-2.0.40-21.11.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/httpd-2.0.40-21.11.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/httpd-devel-2.0.40-21.11.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/httpd-manual-2.0.40-21.11.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/mod_ssl-2.0.40-21.11.i386.rpm



7. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------

d936dc84de88a6c60bdd180827cc06f7 9/en/os/SRPMS/httpd-2.0.40-21.11.src.rpm
9f900749436725ed2e3fe086e3a53cab 9/en/os/i386/httpd-2.0.40-21.11.i386.rpm
faf0eae15fd2a63a2ce2569b6dbab083 9/en/os/i386/httpd-devel-2.0.40-21.11.i386.rpm
4868bf7d599889349b1ba04dd4f589b4 9/en/os/i386/httpd-manual-2.0.40-21.11.i386.rpm
c286771938be54514c2eb568202574ad 9/en/os/i386/mod_ssl-2.0.40-21.11.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/team/key.html

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:

http://nagoya.apache.org/bugzilla/show_bug.cgi?id=27106
http://www.apacheweek.com/features/security-20
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0113

9. Contact:

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

Copyright 2004 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQFAkf8NXlSAg2UNWIIRAsKJAJwK/FtBe8kwiTH5M6slUD5UyNHeTQCeMcQF
dSm0LPSzyN9SAT57oGwq/0U=
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-----END PGP SIGNATURE-----


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