A new Stronghold 3 release is available which fixes several serious buffer
overflow vulnerabilities in OpenSSL, and local privilege escalation
vulnerabilities in MM and mod_ssl.
OpenSSL is a commercial-grade, full-featured, and Open Source toolkit which
implements the Secure Sockets Layer (SSL v2/v3) and Transport Layer
Security (TLS v1) protocols as well as a full-strength general purpose
cryptography library. A security audit of the OpenSSL code sponsored by
DARPA found several buffer overflows in OpenSSL which affect versions 0.9.7
and 0.9.6d and earlier:
1. The master key supplied by a client to an SSL version 2 server could be
oversized, causing a stack-based buffer overflow. This issue is remotely
exploitable. Services that have SSLv2 disabled would not be vulnerable to
this issue. (CAN-2002-0656)
2. The SSLv3 session ID supplied to a client from a malicious server could
be oversized and overrun a buffer. This issue looks to be remotely
exploitable. (CAN-2002-0656)
3. Various buffers used for storing ASCII representations of integers were
too small on 64 bit platforms. This issue may be exploitable. (CAN-2002-0655)
A further issue was found in OpenSSL 0.9.7 that does not affect versions of
OpenSSL included in Stronghold (CAN-2002-0657).
The MM library provides an abstraction layer which allows related processes
to easily share data. On systems where shared memory or other
inter-process communication mechanisms are not available, the MM library
will emulate them using temporary files. MM is used in Stronghold to
providing shared memory pools to Apache modules.
Versions of MM up to and including 1.1.3 open temporary files in an unsafe
manner, allowing a malicious local user to cause an application which uses
MM to overwrite any file to which it has write access. (CAN-2002-0658)
All users are advised to upgrade to the new release which contains a
patched version of MM that is not vulnerable to this issue.
The mod_ssl module provides strong cryptography for the Apache Web
server via the Secure Sockets Layer (SSL) and Transport Layer Security
(TLS) protocols. Versions of mod_ssl prior to 2.8.10 are subject to a
single NUL byte overflow that can cause arbitrary code execution.
(CAN-2002-0653)
In order to exploit this vulnerability, the Apache Web server has to be
configured to allow overriding of configuration settings on a per-directory
basis, and untrusted local users must be able to modify a directory in
which the server is configured to allow overriding. The local attacker may
then become the user that Apache is running as (usually 'www' or 'nobody').
Thanks go to the OpenSSL team, Ben Laurie, and Marcus Meissner for
providing patches for these issues.
We have backported the security fixes for the versions of OpenSSL, mod_ssl
and mm included in Stronghold 3. Stronghold 3.0 build code 3018 is now
available which includes these fixes, and can be downloaded from
http://stronghold.redhat.com/sh3/For information on how to upgrade between releases of Stronghold 3.0, see
http://stronghold.redhat.com/support/upgrade-sh3.xml
openssl, mm, mod_ssl security update for Stronghold