ISS Discovers and Protects Against Flaw in Sendmail Server Software

http://xforce.iss.net/xforce/alerts/id/216         
http://bvlive01.iss.net/issEn/delivery/prdetail.jsp?oid=30423

ATLANTA – March 22, 2006 – Internet Security Systems, Inc. (ISS) 
(NASDAQ: ISSX), the worldwide leader in preemptive, enterprise security, 
today announced that its X-Force® research and development team has 
discovered a serious vulnerability in Sendmail SMTP server software. 
Sendmail is the most popular mail transfer agent (MTA) on the Internet 
and is used extensively by large corporations and government agencies to 
route and deliver email. ISS customers have been preemptively protected 
from this vulnerability since February 14, 2006.

In order to exploit this vulnerability, an attacker simply needs to be 
able to connect to the Sendmail SMTP server over a network. Exploitation 
of this vulnerability could allow remote attackers to take complete 
control of affected machines and obtain full access to users’ emails, 
confidential information and other sensitive data on the network.

“Due to its high popularity and extensive deployment throughout the 
Internet, this vulnerability represents a serious risk to organizations 
that rely upon Sendmail for email services,” said Gunter Ollmann, 
Director of ISS X-Force. “Since SMTP is one of the few listening 
services allowed consistently through perimeter firewalls, we expect 
that many attackers will focus their efforts on developing techniques to 
exploit the vulnerability in order to gain entry into corporate and 
government networks.”

Sendmail is primarily used in UNIX server environments, although various 
Windows versions also exist. It is the default MTA for many operating 
systems. By carefully timing the transmission of malicious data 
targeting this vulnerability, it is possible for a remote attacker to 
gain control of the affected system without requiring any user interaction.

By protecting against vulnerabilities rather than known exploits, ISS 
keeps organizations ahead of Internet threats. Through a multi-layered 
security approach, ISS’ Proventia® security products and services 
provide organizations with comprehensive protection for IT assets from 
network to host. ISS’ Virtual Patch™ technology automatically protects 
organizations from Internet attacks until they are able to obtain, test 
and apply patches from affected vendors.

ISS products and services are based on the work of its X-Force research 
and development team. X-Force has discovered more than 50 percent of all 
critical and high-risk software and infrastructure vulnerabilities 
uncovered by commercial security research groups from 1998 to 2005, 
including the vulnerabilities exploited by the Slammer and Zotob worms.

The ISS X-Force advisory on this vulnerability can be found at: 
http://xforce.iss.net/xforce/alerts/id/216

ISS customers are already protected from this flaw. ISS recommends that 
other companies obtain and apply the patch for this vulnerability from 
the Sendmail Web site (http://www.sendmail.org) or contact their 
operating system vendor for more information.

-- 
Omi Azad
Contributor
Bangla Computing and Localization Projects:
Ankur: http://www.ankurbangla.org
Ekushey: http://www.ekushey.org




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