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July 11, 2007
Symantec SYMTDI.SYS Device Driver Local Elevation of Privilege

Revision History
7/16/2007 Modified Exploit Available information

Risk Impact

Remote AccessNo
Local AccessYes
Authentication RequiredYes, to the local system
Exploit publicly availableProof of Concept code publicly available

Some versions of Symantecís device driver SYMTDI.SYS contain a vulnerability which, if successfully exploited, could allow a local attacker to execute arbitrary code with system level privileges.

Affected Products
Norton AntiSpam 2005 Run LiveUpdate in Interactive Mode
Norton AntiVirus 2005, 2006 Run LiveUpdate in Interactive Mode
Norton Internet Security 2005, 2006 Run LiveUpdate in Interactive Mode
Norton Personal Firewall 2005, 2006 Run LiveUpdate in Interactive Mode
Norton System Works 2005, 2006 Run LiveUpdate in Interactive Mode
Symantec AntiVirus Corporate Edition 9.x SAV 9 MR6 MP1
Symantec AntiVirus Corporate Edition 10.0 SAV 10.1 MR6
Symantec Client Security 2.0 SCS 2.0 MR6 MP1
Symantec Client Security 3.0 SCS 3.1 MR6
Symantec Client Security 3.1 SCS 3.1 MR6

NOTE: All builds of Symantec AntiVirus Corporate Edition (SAV CE) 9.x, 10.0, and 10.1 prior to the solution listed are affected by this issue. All builds of Symantec Client Security (SCS) prior to the solution listed are affected by this issue.

Unaffected Products
Norton 360 All all
Norton AntiVirus 2007 all
Norton Confidential all all
Norton Internet Security 2007 all
Symantec AntiVirus Corporate Edition 10.2 all
Symantec AntiVirus for Linux 1.x all

iDefense notified Symantec about an input validation error in the IOCTL handler function of the device driver SYMTDI.SYS. A specially crafted IRP sent to an IOCTL handler function could allow memory to be overwritten because the address space was not properly validated in some versions of the driver. A successful exploit of this vulnerability could potentially allow an attacker to execute code of their choice with kernel level privileges. The attack, which requires authenticated local access, could also result in a blue screen (system crash).

Symantec response
Symantec engineers have verified that the issue exists in the products listed in the Affected Products table, above. Updates have been provided for all supported affected products.

Symantec is not aware of any customers impacted by this issue, or of any attempts to exploit the issue.

As a part of normal best practices, users should keep vendor-supplied patches for all application software and operating systems up-to-date. Symantec strongly recommends any affected customers update their product immediately to protect against possible future attempts to exploit this vulnerability.

Updating Consumer (Norton) products
Symantec Norton product users who regularly launch and run LiveUpdate should already have received an updated (non-vulnerable) version of SYMTDI.SYS. However, to ensure all available updates have been applied, users can manually launch and run LiveUpdate in Interactive mode as follows:

  • Open any installed Norton product
  • Click on LiveUpdate in the GUI
  • Run LiveUpdate until all available product updates are downloaded and installed
  • A system reboot is required for this update

Best Practices
Symantec recommends any affected customers update their product to protect against potential attempts to exploit this issue. As part of normal best practices, Symantec recommends the following:

  • Do not open email from unknown senders.
  • Run under the principle of least privilege to limit the impact of exploits.
  • Keep all operating systems and applications updated with the latest vendor patches.
  • Follow a multi-layered approach to security. Run both firewall and antivirus software to provide multiple points of detection and protection from inbound and outbound threats.
  • Use network intrusion detection systems to monitor network traffic for signs of anomalous activity. This may aid in detection of attacks related to exploitation of vulnerabilities.

Symantec would like to acknowledge Zohiartze Herce, working with the iDefense Vulnerability Contributor Program (http://www.idefense.com), for reporting this issue.

This issue is a candidate for inclusion in the Common Vulnerabilities and Exposures (CVE) list (http://cve.mitre.org),which standardizes names for security problems. CVE has assigned CVE-2007-3673 to this issue.

SecurityFocus has assigned Bugtraq ID (BID) 22351 to this issue.

Symantec takes the security and proper functionality of our products very seriously. As founding members of the Organization for Internet Safety (OISafety), Symantec supports and follows the principles of responsible disclosure. Symantec also subscribes to the vulnerability disclosure guidelines outlined by the National Infrastructure Advisory Council (NIAC).

Please contact secure@symantec.com if you feel you have discovered a security issue in a Symantec product. A Symantec Product Security team member will contact you regarding your submission. Symantec strongly recommends using encrypted email for reporting vulnerability information to secure@symantec.com. The Symantec Product Security PGP key can be found at the end of this message.

Symantec has developed a Product Vulnerability Response document outlining the process we follow in addressing suspected vulnerabilities in our products. This document is available below.

PDF Symantec Vulnerability Response Policy PGP Symantec Product Vulnerability Management PGP Key

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Initial Post on: Wednesday, 11-Jul-07 7:00:00
Last modified on: Monday, 16-Jul-2007 11:48:19 PDT