Technical Description

Multiple vulnerabilities have been identified in various F-Secure Anti-Virus products, which could be exploited by attackers or malware to take complete control of an affected system or cause a denial of service.

The first issue is caused by a buffer overflow error when processing malformed LHA archives, which could be exploited by attackers to execute arbitrary commands by tricking a system protected by a vulnerable application to scan a malicious file.

The second vulnerability is caused by an infinite loop when handling malformed archives or packed executables, which could be exploited by attackers to crash a vulnerable application, creating a denial of service condition.

The third issue is caused due to improper access validation of the address space used by the Real-time Scanning component, which could be exploited by malicious local attackers to obtain elevated privileges via a specially crafted IRP (I/O request packet).

Affected Products

F-Secure Anti-Virus for Workstations version 5.44 and prior
F-Secure Anti-Virus for Windows Servers version 5.52 and prior
F-Secure Anti-Virus for Citrix Servers version 5.52
F-Secure Anti-Virus for MIMEsweeper version 5.61 and prior
F-Secure Anti-Virus Client Security version 6.03 and prior
F-Secure Anti-Virus for MS Exchange version 6.40 and prior
F-Secure Internet Gatekeeper version 6.60 and prior
F-Secure Internet Security 2005
F-Secure Internet Security 2006
F-Secure Internet Security 2007
F-Secure Anti-Virus 2005
F-Secure Anti-Virus 2006
F-Secure Anti-Virus 2007
F-Secure Protection Service for Consumers version 6.40 and prior
F-Secure Anti-Virus for Linux Servers version 4.65 and prior
F-Secure Anti-Virus for Linux Gateways version 4.65 and prior
F-Secure Anti-Virus Linux Client Security 5.30 and prior
F-Secure Anti-Virus Linux Server Security 5.30 and prior
F-Secure Internet Gatekeeper for Linux 2.16 and prior

Solution

Apply patches :
http://www.f-secure.com/security/fsc-2007-1.shtml
http://www.f-secure.com/security/fsc-2007-2.shtml
http://www.f-secure.com/security/fsc-2007-3.shtml

References

http://www.vupen.com/english/advisories/2007/1985
http://www.f-secure.com/security/fsc-2007-1.shtml
http://www.f-secure.com/security/fsc-2007-2.shtml
http://www.f-secure.com/security/fsc-2007-3.shtml

Credits

Vulnerabilities reported by Sergio Alvarez (n.runs AG) and the vendor.

ChangeLog

2007-05-30 : Initial release

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