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Home » Hacking News » ESA-20020423-009 -webalizer

ESA-20020423-009 -webalizer

by Nikola Strahija on April 23rd, 2002 There is a potentially exploitable buffer overflow in webalizer which could allow an attacker to compromise a host by spoofing reverse DNS queries.


DETAIL
- ------
The Webalizer is a fast, free web server log file analysis program. It
produces highly detailed, easily configurable usage reports in HTML
format, for viewing with a standard web browser.

Webalizer also has the ability to perform reverse DNS lookups. An
attacker with control over the victims DNS may spoof responses thus
triggering a buffer overflow, potentially leading to a root compromise.

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

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

UPDATED PACKAGES
- ----------------
These updated packages are for EnGarde Secure Linux Community
Edition.

Source Packages:

SRPMS/webalizer-2.01-1.0.4.src.rpm
MD5 Sum: 4b182641716929e667b532b34143a56f

Binary Packages:

i386/webalizer-2.01-1.0.4.i386.rpm
MD5 Sum: 26d607aa844675e643ac1cbb37c66363

i686/webalizer-2.01-1.0.4.i686.rpm
MD5 Sum: 5da5952a4d1ff859e4d96b9d8ab02793

REFERENCES
- ----------
Guardian Digital's public key:
http://ftp.engardelinux.org/pub/engarde/ENGARDE-GPG-KEY

Credit for the discovery of this bug goes to:
Spybreak

The Webalizer's Official Web Site:
http://www.webalizer.org/

Security Contact: [email protected]
EnGarde Advisories: http://www.engardelinux.org/advisories.html

- --------------------------------------------------------------------------
$Id: ESA-20020423-009-webalizer,v 1.1 2002/04/23 16:46:06 rwm Exp $
- --------------------------------------------------------------------------
Author: Ryan W. Maple,
Copyright 2002, Guardian Digital, Inc.

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