vulnerability in Symantec products
Critical vulnerability was discovered in Symantec Internet Security 2005,
posible afected products: Symantec Personal Firewall 2005, Symantec Internet
Security 2004, Symantec Personal Firewall 2004, Symantec Personal Firewall
2003, Symantec Internet Security 2006, Symantec Personal Firewall 2006.
Defective program feature allows to establish remote connections undetected -
thus creating a perfect exploit for trojans and hacker activities. Symantec
products generally have a rule "Default outbound NetBIOS", allowing programs to
establish direct IP connections on ports 137, 138, 139. Therefore, trojan
programs can undetectably bypass Symantec firewall and connect on these ports
to attacker's remote server. However, resolving IP from DNS will be detected by
the firewall.
Solutions:
- Disable "Default outbound NetBIOS" rule
- Modify "Default outbound NetBIOS" rule and restrict connections only to LAN
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DimichSoft Security Group
http://www.dimichsoft.com/security.html