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[ESA-20020301-005] 'apache' (mod_ssl) session caching buffer overflow
From: EnGarde Secure Linux <security () guardiandigital com>
Date: Fri, 1 Mar 2002 01:10:14 -0500 (EST)

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+------------------------------------------------------------------------+
| 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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