Date: Wed, 24 Jul 2002 14:57:57 -0400 (EDT)
From: EnGarde Secure Linux <[email protected]>
To: [email protected], [email protected]Subject: [ESA-20020724-018] Buffer overflow in BIND4-derived resolver code.
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| 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: [email protected]
EnGarde Advisories: http://www.engardelinux.org/advisories.html
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$Id: ESA-20020724-018-resolver,v 1.1 2002/07/24 16:43:17 rwm Exp $
- --------------------------------------------------------------------------
Author: Ryan W. Maple <[email protected]>
Copyright 2002, Guardian Digital, Inc.
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