(Engarde Issues Fix) 'mod_ssl' Security Package for Apache Web Server Has Buffer Overflow That Can Be Triggered By Remote Users
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SecurityTracker Alert ID: 1003707 |
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SecurityTracker URL: http://securitytracker.com/id/1003707
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Mar 1 2002
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Impact:
Execution of arbitrary code via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 2.8.7
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Description:
A vulnerability was reported in the 'mod_ssl' package for the Apache web server. A remote user may be able to overflow a buffer. The potential impact is not yet know.
It is reported that a remote user may be able to trigger a buffer overflow in the DBM and SHMHT session cache by using very large certificate chains. This is reportedly due to the unbounded nature of ASN.1 representations that could overflow a large but statically allocated buffer.
It is not yet clear if remote code execution is feasible.
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Impact:
A remote user may be able to trigger a buffer overflow in mod_ssl. It is not yet clear if remote code execution is feasible.
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Solution:
The vendor has released a fix.
Guardian Digital recently made available the Guardian Digital Secure Update, a means to proactively keep systems secure and manage system software. EnGarde users can automatically update their system using the Guardian Digital WebTool secure interface.
If choosing to manually upgrade this package, updates can be obtained from:
ftp://ftp.engardelinux.org/pub/engarde/stable/updates/
http://ftp.engardelinux.org/pub/engarde/stable/updates/
Before upgrading the package, the machine must either:
a) be booted into a "standard" kernel; or
b) have LIDS disabled.
To disable LIDS, execute the command:
# /sbin/lidsadm -S -- -LIDS_GLOBAL
To install the updated package, execute the command:
# rpm -Uvh <filename>
You must now update the LIDS configuration by executing the command:
# /usr/sbin/config_lids.pl
To re-enable LIDS (if it was disabled), execute the command:
# /sbin/lidsadm -S -- +LIDS_GLOBAL
To verify the signatures of the updated packages, execute the command:
# rpm -Kv <filename>
These updated packages are for EnGarde Secure Linux 1.0.1 (Finestra).
Source Packages:
SRPMS/apache-1.3.23-1.0.27.src.rpm
MD5 Sum: 412c8ed8f0151dc023372b70aac0475c
Binary Packages:
i386/apache-1.3.23-1.0.27.i386.rpm
MD5 Sum: 66b23a6224b1916983c4350e95c35fd6
i686/apache-1.3.23-1.0.27.i686.rpm
MD5 Sum: 4dc0650fb82a15aa00927cabcb02b230
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Vendor URL: www.modssl.org/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (EnGarde)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Fri, 1 Mar 2002 01:10:14 -0500 (EST)
Subject: [ESA-20020301-005] 'apache' (mod_ssl) session caching buffer overflow
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
+------------------------------------------------------------------------+
| EnGarde Secure Linux Security Advisory March 01, 2002 |
| http://www.engardelinux.org/ ESA-20020301-005 |
| |
| Package: apache (mod_ssl) |
| Summary: mod_ssl's session caching mechanisms contain a potential |
| buffer overflow |
+------------------------------------------------------------------------+
EnGarde Secure Linux is a secure distribution of Linux that features
improved access control, host and network intrusion detection, Web
based secure remote management, complete e-commerce using AllCommerce,
and integrated open source security tools.
OVERVIEW
- --------
There is a buffer overflow in mod_ssl, part of EnGarde's apache package,
which an attacker may potentially trigger by sending a very long client
certificate.
DETAIL
- ------
mod_ssl is an apache module used to provide SSL functionality using the
OpenSSL toolkit. Ed Moyle has discovered a buffer overflow in
mod_ssl's session caching mechanisms using dbm and shared memory.
We would like to stress that this vulnerability is in mod_ssl, not in
apache. We are issuing an apache update because we include mod_ssl as
part of our apache package.
SOLUTION
- --------
All users should upgrade to the most recent version as outlined in
this advisory.
Guardian Digital recently made available the Guardian Digital Secure
Update, a means to proactively keep systems secure and manage
system software. EnGarde users can automatically update their system
using the Guardian Digital WebTool secure interface.
If choosing to manually upgrade this package, updates can be
obtained from:
ftp://ftp.engardelinux.org/pub/engarde/stable/updates/
http://ftp.engardelinux.org/pub/engarde/stable/updates/
Before upgrading the package, the machine must either:
a) be booted into a "standard" kernel; or
b) have LIDS disabled.
To disable LIDS, execute the command:
# /sbin/lidsadm -S -- -LIDS_GLOBAL
To install the updated package, execute the command:
# rpm -Uvh <filename>
You must now update the LIDS configuration by executing the command:
# /usr/sbin/config_lids.pl
To re-enable LIDS (if it was disabled), execute the command:
# /sbin/lidsadm -S -- +LIDS_GLOBAL
To verify the signatures of the updated packages, execute the command:
# rpm -Kv <filename>
UPDATED PACKAGES
- ----------------
These updated packages are for EnGarde Secure Linux 1.0.1 (Finestra).
Source Packages:
SRPMS/apache-1.3.23-1.0.27.src.rpm
MD5 Sum: 412c8ed8f0151dc023372b70aac0475c
Binary Packages:
i386/apache-1.3.23-1.0.27.i386.rpm
MD5 Sum: 66b23a6224b1916983c4350e95c35fd6
i686/apache-1.3.23-1.0.27.i686.rpm
MD5 Sum: 4dc0650fb82a15aa00927cabcb02b230
REFERENCES
- ----------
Guardian Digital's public key:
http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY
Credit for the discovery of this bug goes to:
Ed Moyle <emoyle@scsnet.csc.com>
mod_ssl's Official Web Site:
http://www.modssl.org/
Security Contact: security@guardiandigital.com
EnGarde Advisories: http://www.engardelinux.org/advisories.html
- --------------------------------------------------------------------------
$Id: ESA-20020301-005-apache,v 1.3 2002/03/01 05:24:50 rwm Exp $
- --------------------------------------------------------------------------
Author: Ryan W. Maple, <ryan@guardiandigital.com>
Copyright 2002, Guardian Digital, Inc.
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------------------------------------------------------------------------
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Copyright(c) 2001 Guardian Digital, Inc. EnGardeLinux.org
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