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Security Advisory FSC-2007-3

Vulnerabilities in scanning of specially crafted archives and certain packed executables

Date issued 2007-05-30
Last updated 2007-05-22
Risk factor High (Low/Medium/High/Critical)
Brief description Specially crafted archives and packed executables set antivirus scanning to loop.
Software F-Secure's Anti-Virus products for Microsoft Windows and Linux
Affected versions F-Secure Anti-Virus for Workstations version 7.00 and earlier
F-Secure Anti-Virus for Windows Servers version 7.00 and earlier
F-Secure Anti-Virus for Citrix Servers version 5.52
F-Secure Anti-Virus for MIMEsweeper version 5.61 and earlier
F-Secure Client Security version 7.00 and earlier
F-Secure Anti-Virus for MS Exchange version 7.00 and earlier
F-Secure Internet Gatekeeper version 6.60 and earlier
F-Secure Internet Security 2005, 2006 and 2007
F-Secure Anti-Virus 2005, 2006 and 2007
Solutions based on F-Secure Protection Service for Consumers version 7.00 and earlier
F-Secure Anti-Virus for Linux Servers version 4.65 and earlier
F-Secure Anti-Virus for Linux Gateways version 4.65 and earlier
F-Secure Linux Client Security 5.52 and earlier
F-Secure Linux Server Security 5.52 and earlier
F-Secure Internet Gatekeeper for Linux 2.16 and earlier
Affected platforms All platforms supported by the affected products
Advisory location http://www.f-secure.com/security/fsc-2007-3.shtml
Issue Specially crafted archives and packed executables allow attacker to create denial-of-service condition in F-Secure antivirus solutions, by causing a loop in file scanning.
Products F-Secure Internet Security 2005, 2006 and 2007
F-Secure Anti-Virus 2005, 2006 and 2007
Solutions based on F-Secure Protection Service for Consumers version 7.00 and earlier
Risk factor High
  These products contain the described vulnerabilities. However recent antivirus database updates have automatically fixed both of the mentioned issues, without any intervention needed by the user/administrator.
Products F-Secure Anti-Virus for Workstations 7.00 and earlier
Risk factor High
  These products contain the described vulnerabilities. However recent antivirus database updates have automatically fixed both of the mentioned issues, without any intervention needed by the user/administrator.
Products F-Secure Anti-Virus Client Security version 7.00 and earlier
Risk factor High
  These products contain the described vulnerabilities. However recent antivirus database updates have automatically fixed both of the mentioned issues, without any intervention needed by the user/administrator.
Server and gateway products F-Secure Anti-Virus for Windows Servers 7.00 and earlier
F-Secure Anti-Virus for Citrix Servers version 5.52 and earlier
F-Secure Anti-Virus for MIMEsweeper 5.61 and earlier
F-Secure Internet Gatekeeper 6.60 and earlier
F-Secure Anti-Virus for MS Exchange version 7.00 and earlier
F-Secure Anti-Virus Linux Server Security 5.52 and earlier
F-Secure Anti-Virus for Linux Servers version 4.65 and earlier
F-Secure Anti-Virus for Linux Gateways version 4.65 and earlier
F-Secure Internet Gatekeeper for Linux 2.16
Risk factor High
  These products contain the described vulnerabilities. However recent antivirus database updates have automatically fixed both of the mentioned issues, without any intervention needed by the user/administrator.
Mitigating factors
  • Exploitation of the vulnerabilities requires specially crafted archives or packed executables.
  • Vulnerability in archive scanning concerns only those products that scan inside archives by default.
  • These issues have been fixed automatically in F-Secure database updates. This applies all the affected product versions with the exception of deployments not using automatic or automated scripts for the updates.

Available patches:

Product Versions Hotfix ID Download
F-Secure Internet Security 2005 - 2007 2005 - 2007 - Fixed automatically in database updates.
F-Secure Anti-Virus 2005 - 2007 2005 - 2007 - Fixed automatically in database updates.
F-Secure Protection Service for Consumers 7.00 and earlier - Fixed automatically in database updates.
F-Secure Anti-Virus for Workstations 5.44 - 7.00 - Fixed automatically in database updates.
F-Secure Anti-Virus Client Security 6.00 - 7.00 - Fixed automatically in database updates.
F-Secure Anti-Virus for Windows Servers 5.52 - 7.00 - Fixed automatically in database updates.
F-Secure Anti-Virus for Citrix Servers 5.50 - 5.52 - Fixed automatically in database updates.
F-Secure Anti-Virus for MIMEsweeper 5.61 - Fixed automatically in database updates.
F-Secure Anti-Virus for MS Exchange 6.40 - 6.62 - Fixed automatically in database updates.
F-Secure Internet Gatekeeper 6.60 - Fixed automatically in database updates.
F-Secure Anti-Virus for Linux Servers 4.64 - 4.65 - Fixed automatically in database updates.
F-Secure Anti-Virus for Linux Gateways 4.64 - 4.65 - Fixed automatically in database updates.
F-Secure Anti-Virus Linux Client Security 5.30 - 5.52 - Fixed automatically in database updates.
F-Secure Anti-Virus Linux Server Security 5.30 - 5.52 - Fixed automatically in database updates.
F-Secure Internet Gatekeeper for Linux 2.16 - Fixed automatically in database updates.
Credits F-Secure wants to thank Sergio Alvarez in n.runs AG for reporting these issues.
Revision history FSC-2007-3 / 2007-05-30

Contact information:
Support: http://www.f-secure.com/en_EMEA/support/