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TITLE:
F-Secure Antivirus Products Scanning Bypass Vulnerability

SECUNIA ADVISORY ID:
SA20858

VERIFY ADVISORY:
http://secunia.com/advisories/20858/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass

WHERE:
>From remote

SOFTWARE:
F-Secure Anti-Virus 2004
http://secunia.com/product/3500/
F-Secure Anti-Virus 2005
http://secunia.com/product/4299/
F-Secure Anti-Virus 2006
http://secunia.com/product/6882/
F-Secure Anti-Virus Client Security 5.x
http://secunia.com/product/2718/
F-Secure Anti-Virus Client Security 6.x
http://secunia.com/product/5786/
F-Secure Anti-Virus for Citrix Servers 5.x
http://secunia.com/product/5198/
F-Secure Anti-Virus for MIMEsweeper 5.x
http://secunia.com/product/455/
F-Secure Anti-Virus for Windows Servers 5.x
http://secunia.com/product/452/
F-Secure Anti-Virus for Workstations 5.x
http://secunia.com/product/457/
F-Secure Internet Security 2004
http://secunia.com/product/3499/
F-Secure Internet Security 2005
http://secunia.com/product/4300/
F-Secure Internet Security 2006
http://secunia.com/product/6883/
F-Secure Service Platform for Service Providers (Personal Express)
6.x
http://secunia.com/product/6885/

DESCRIPTION:
Two vulnerabilities have been reported in various F-Secure Antivirus
products, which can be exploited by malware to bypass the scanning
functionality.

1) An unspecified error within the handling of executable programs
where the name has been manipulated in a certain way can be exploited
to bypass the anti-virus scanning functionality.

2) An error causes files on removable media to not be scanned when
the "Scan network devices" option has been disabled.

Successful exploitation of the vulnerabilities bypasses the real-time
scanning functionality and may result in execution of malware on the
system.

SOLUTION:
Apply patches (see patch matrix in the vendor's advisory).

PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.

ORIGINAL ADVISORY:
F-Secure:
http://www.f-secure.com/security/fsc-2006-4.shtml

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

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