7721213 2001-12-27 11:18 -0500 /126 rader/ EnGarde Secure Linux <security@guardiandigital.com>
Sänt av: joel@lysator.liu.se
Importerad: 2001-12-27 18:33 av Brevbäraren
Extern mottagare: engarde-security@guardiandigital.com
Extern mottagare: bugtraq@securityfocus.com
Mottagare: Bugtraq (import) <20292>
Ärende: [ESA-20011227-01] stunnel format string vulnerability
------------------------------------------------------------
From: EnGarde Secure Linux <security@guardiandigital.com>
To: engarde-security@guardiandigital.com, bugtraq@securityfocus.com
Message-ID: <20011227161903.003A911D303@juggernaut.guardiandigital.com>
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| EnGarde Secure Linux Security Advisory December 27, 2001 |
| http://www.engardelinux.org/ ESA-20011227-01 |
| |
| Package: stunnel |
| Summary: There is a format string vulnerability in stunnel. |
+------------------------------------------------------------------------+
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 format string vulnerability in stunnel which may allow an
attacker to exploit a victim by impersonating a mail server.
DETAIL
- ------
There are a couple of instances in stunnel where a format is not passed
to a printf-like function, leading to your classic format string
vulnerability. It is not know weather or not it is exploitable at this
time but all users are recommended to upgrade in any event.
This vulnerability was disclosed on December 18 by Matthias Lange
on the stunnel-users mailing list. The original message may be
found here:
http://marc.theaimsgroup.com/?l=stunnel-users&m=100868569203440&w=3
All users should upgrade to the most recent version, as outlined in
SOLUTION
- --------
All users should upgrade to the most recent version as outlined in
this advisory. All updates may be found at:
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/stunnel-3.22-1.0.4.src.rpm
MD5 Sum: e408662d6fc54f3979642c9e8c110ba4
Binary Packages:
i386/stunnel-3.22-1.0.4.i386.rpm
MD5 Sum: 482ff9210541d73b114404ccb9732cf0
i686/stunnel-3.22-1.0.4.i686.rpm
MD5 Sum: afad91053b8d482e36e85251fab06755
REFERENCES
- ----------
Guardian Digital's public key:
http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY
Credit for the discovery of this bug goes to:
Matthias Lange <ml@netuse.de>
stunnel's Official Web Site:
http://stunnel.mirt.net/
Security Contact: security@guardiandigital.com
EnGarde Advisories: http://www.engardelinux.org/advisories.html
- --------------------------------------------------------------------------
$Id: ESA-2001122701-stunnel,v 1.2 2001/12/27 16:02:00 rwm Exp $
- --------------------------------------------------------------------------
Author: Ryan W. Maple, <ryan@guardiandigital.com>
Copyright 2001, Guardian Digital, Inc.
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