Bloodhound.Exploit.24

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Discovered: February 06, 2005
Updated: February 13, 2007 12:33:11 PM
Type: Trojan Horse, Worm
Systems Affected: Windows
CVE References: CAN-2004-0599 CAN-2004-0597 CAN-2004-1244 CAN-2005-1211



Bloodhound.Exploit.24 is a heuristic detection for malformed Portable Network Graphics (PNG) files attempting to exploit one of the several buffer overflows in libPNG (which is described in Microsoft Security Bulletin MS05-009 and Microsoft Security Bulletin MS05-025 ).

This applies to applications that render and display PNG images, such as Microsoft Windows Messenger, Microsoft MSN Messenger, and Windows Media Player 9 (except under Windows XP SP2). Microsoft Internet Explorer is not impacted.

Antivirus Protection Dates

  • Initial Rapid Release version February 06, 2005
  • Latest Rapid Release version February 06, 2005
  • Initial Daily Certified version October 31, 2007 revision 003
  • Latest Daily Certified version June 17, 2008 revision 017
  • Initial Weekly Certified release date February 09, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Discovered: February 06, 2005
Updated: February 13, 2007 12:33:11 PM
Type: Trojan Horse, Worm
Systems Affected: Windows
CVE References: CAN-2004-0599 CAN-2004-0597 CAN-2004-1244 CAN-2005-1211


Bloodhound.Exploit.24 is a heuristic detection for malformed Portable Network Graphics (PNG) files attempting to exploit one of the several buffer overflows in libPNG.

The vulnerabilities are caused by a missing length check during procesing of tRNS chunks, and insufficient boundary checking when decoding sBIT or hIST chunks, resulting in either a denial of service, or a heap- or stack-based overflow, potentially allowing the execution of arbitrary code.

Files that are detected as Bloodhound.Exploit.24 may be malicious. We suggest that you submit to Symantec Security Response any files that are detected as Bloodhound.Exploit.24. For instructions on how to do this using Scan and Deliver, read How to submit a file to Symantec Security Response using Scan and Deliver ".

Recommendations

Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":

  • Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
  • Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
  • Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
  • Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
  • Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
  • Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
  • If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
  • Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
  • Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
  • Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
  • Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
  • If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.
  • For further information on the terms used in this document, please refer to the Security Response glossary.