Date: 01 October 2002
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A U S C E R T A L E R T
AL-2002.12 -- AUSCERT ALERT
01 October 2002
AusCERT Alert Summary
There is a new Win32 virus called BUGBEAR that spreads via e-mail
and network shares. It exploits a previously addressed Microsoft
MIME vulnerability, in which Internet Explorer could be coopted
into automatically executing a binary file when rendering a HTML
e-mail. As this virus requires no user interaction for its
execution from an infected email, the risk of propagation is great
for sites where the original vulnerability has not been patched.
There has been a recent increase in NETBIOS port 137 (UDP) scanning
on the Internet, possibly as a result of this virus.
Information about Microsoft MS01-020 vulnerability and updates:
Information about BUGBEAR:
Install patches available from Microsoft to address the MS01-020
When possible, upgrade all anti-virus software to use the latest
definition files as soon as they become available.
Ensure that all network file shares are disabled unless necessary
and if possible ensure that active shares are password protected.
Disallow traffic for ports 137 and 139 at external firewall/s and
monitor for any unusual increase in internal traffic to these
ports that may indicate virus activity.
AusCERT advises members to disseminate and take action on this
information to prevent any undesirable activity by this virus
within their sites.
The AusCERT team has made every effort to ensure that the information
contained in this document is accurate at the time of publication. However,
the decision to use the information described is the responsibility of
each user or organisation. The appropriateness of this document for an
organisation or individual system should be considered before application
in conjunction with local policies and procedures. AusCERT takes no
responsibility for the consequences of applying the contents of this
If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
AusCERT maintains an anonymous FTP service which is found on:
ftp://ftp.auscert.org.au/pub/. This archive contains past SERT
and AusCERT Advisories, and other computer security information.
AusCERT maintains a World Wide Web service which is found on:
Internet Email: firstname.lastname@example.org
Facsimile: (07) 3365 7031
Telephone: (07) 3365 4417 (International: +61 7 3365 4417)
AusCERT personnel answer during Queensland business
hours which are GMT+10:00 (AEST). On call after hours
for member emergencies only.
Australian Computer Emergency Response Team
The University of Queensland
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