-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 +------------------------------------------------------------------------+ | 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 <mlat_private> stunnel's Official Web Site: http://stunnel.mirt.net/ Security Contact: securityat_private 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, <ryanat_private> Copyright 2001, Guardian Digital, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE8K0n1HD5cqd57fu0RAgGXAKCVsY0gY+WDXFODzXS4bT035Wn4aACgjDhW /GDA/zylAcAX3fwuQl0MB5c= =0i8Q -----END PGP SIGNATURE-----
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