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Home » Security Advisories» Red Hat » Mod_ssl security issue

Mod_ssl security issue

A flaw was discovered in mod_ssl's handling of the "SSLVerifyClient" directive. This flaw occurs if a virtual host is configured using "SSLVerifyClient optional" and a directive "SSLVerifyClient required" is set for a specific location. For servers configured in this fashion, an attacker may be able to access resources that should otherwise be protected, by not supplying a client certificate when connecting.

  • Vendor: Red Hat
  • Vendor ID: RHSA-2005:773-01
  • Date: September 15, 2005


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Red Hat Security Advisory

Synopsis: Important: mod_ssl security update
Advisory ID: RHSA-2005:773-01
Advisory URL: https://rhn.redhat.com/errata/RHSA-2005-773.html
Issue date: 2005-09-15
Updated on: 2005-09-15
Product: Red Hat Enterprise Linux
CVE Names: CAN-2005-2700
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1. Summary:

An updated mod_ssl package for Apache that corrects a security issue is now
available.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386

3. Problem description:

The mod_ssl module provides strong cryptography for the Apache Web
server via the Secure Sockets Layer (SSL) and Transport Layer Security
(TLS) protocols.

A flaw was discovered in mod_ssl's handling of the "SSLVerifyClient"
directive. This flaw occurs if a virtual host is configured
using "SSLVerifyClient optional" and a directive "SSLVerifyClient
required" is set for a specific location. For servers configured in this
fashion, an attacker may be able to access resources that should otherwise
be protected, by not supplying a client certificate when connecting. The
Common Vulnerabilities and Exposures project assigned the name
CAN-2005-2700 to this issue.

Users of mod_ssl should upgrade to this updated package, which contains a
backported patch to correct this issue.

4. Solution:

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

This update is available via Red Hat Network. 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/):

167195 - CAN-2005-2700 SSLVerifyClient flaw


6. RPMs required:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/mod_ssl-2.8.12-8.src.rpm
70c9491a26f4192159f0874a415f32f4 mod_ssl-2.8.12-8.src.rpm

i386:
a8b75736c811bd68b755505e156e4904 mod_ssl-2.8.12-8.i386.rpm

ia64:
b24dc850c203e5c354773b07a6c19a5a mod_ssl-2.8.12-8.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/mod_ssl-2.8.12-8.src.rpm
70c9491a26f4192159f0874a415f32f4 mod_ssl-2.8.12-8.src.rpm

ia64:
b24dc850c203e5c354773b07a6c19a5a mod_ssl-2.8.12-8.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/mod_ssl-2.8.12-8.src.rpm
70c9491a26f4192159f0874a415f32f4 mod_ssl-2.8.12-8.src.rpm

i386:
a8b75736c811bd68b755505e156e4904 mod_ssl-2.8.12-8.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

SRPMS:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/mod_ssl-2.8.12-8.src.rpm
70c9491a26f4192159f0874a415f32f4 mod_ssl-2.8.12-8.src.rpm

i386:
a8b75736c811bd68b755505e156e4904 mod_ssl-2.8.12-8.i386.rpm

These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2005-2700

8. Contact:

The Red Hat security contact is [email protected]>. More contact
details at https://www.redhat.com/security/team/contact/

Copyright 2005 Red Hat, Inc.

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