-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 +------------------------------------------------------------------------+ | EnGarde Secure Linux Security Advisory July 24, 2002 | | http://www.engardelinux.org/ ESA-20020724-018 | | | | Packages: bind-chroot, bind-chroot-utils, glibc | | Summary: Buffer overflow in BIND4-derived resolver code. | +------------------------------------------------------------------------+ 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 vulnerability in BIND4-derived resolver libraries which may be triggered by a malicious DNS server sending multiple CNAME records in a response. This may lead to arbitrary code execution or a denial of service attack. Such code is included in our BIND (bind-chroot, bind-chroot-utils) or GNU libc (glibc) packages. The BIND DNS server itself is not vulnerable, only the resolver library (libbind) is. No programs are believed to use this library. Please also note that glibc is only vulnerable if /etc/nsswitch.conf has been directed to use DNS for network mapping. By default EnGarde only uses files. SOLUTION - -------- Users of the EnGarde Professional edition can use the Guardian Digital Secure Network to update their systems automatically. EnGarde Community users should upgrade to the most recent version as outlined in this advisory. Updates may 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 files 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 files UPDATED PACKAGES - ---------------- These updated packages are for EnGarde Secure Linux Community Edition. Source Packages: SRPMS/bind-chroot-8.2.6-1.0.27.src.rpm MD5 Sum: b9f5e9557b93ec5883c7589c05b8b927 SRPMS/glibc-2.1.3-1.0.5.src.rpm MD5 Sum: 867604905b17afae6c619175f10b8cb3 Binary Packages: i386/bind-chroot-8.2.6-1.0.27.i386.rpm MD5 Sum: 9e8a8d144d8e251dfa3d44b4281b1600 i386/bind-chroot-utils-8.2.6-1.0.27.i386.rpm MD5 Sum: 8411aabd49c431c42307bfaebd836d88 i386/glibc-2.1.3-1.0.5.i386.rpm MD5 Sum: 83b18d442d62c7d2586ce42e0659759e i686/bind-chroot-8.2.6-1.0.27.i686.rpm MD5 Sum: dab84baddfc8c7b12c378019faacf802 i686/bind-chroot-utils-8.2.6-1.0.27.i686.rpm MD5 Sum: ee355b60a8b0cf77bdabc243140cbd45 REFERENCES - ---------- Guardian Digital's public key: http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY BIND's Official Web Site: http://www.isc.org/products/BIND/ glibc's Official Web Site: http://www.gnu.org/software/libc/libc.html Security Contact: securityat_private EnGarde Advisories: http://www.engardelinux.org/advisories.html - -------------------------------------------------------------------------- $Id: ESA-20020724-018-resolver,v 1.1 2002/07/24 16:43:17 rwm Exp $ - -------------------------------------------------------------------------- Author: Ryan W. Maple <ryanat_private> Copyright 2002, Guardian Digital, Inc. -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org iD8DBQE9Pvi8HD5cqd57fu0RAmceAKCQUEy2NQpRqKnC0BqKMRXztkzuXQCeILop dwpwLbQvvkT6it3oKR3V928= =8BRp -----END PGP SIGNATURE-----
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