A vulnerability was discovered in a component of Symantec Security Check's online interface. The vulnerability is a buffer overflow in an ActiveX component. An exploit of this vulnerability can lead to unauthorized system access.
Symantec Security Check rufsi.dll dated prior to June 23, 2003.
Symantec was made aware of Symantec Security Check's ActiveX buffer overflow vulnerability on Monday June 23, 2003 through a public posting on the Internet. Since hearing of the exploit Symantec has worked diligently to replace the ActiveX Control on Symantec Security Check. Through Symantec's customer support, we are working with users who may have downloaded the exploited ActiveX Control to remove it from their systems. Although Symantec Security Check is available to both PC and Mac users, this issue only affects PCs.
Symantec Security Check is a free web-based tool that enables users to test their computer's exposure to a wide range of on-line threats. As part of running the check, users may install an ActiveX Control, which remains on the user's system even after the check has completed.
The current ActiveX Control - which can be named Symantec RuFSI Utility Class or Symantec RuFSI Registry Information Class - contains a buffer overflow exploit. The buffer overflow can be exploited when the user with this ActiveX Control visits a malicious website intent on exploiting this vulnerability. The exploit can cause Internet Explorer to crash and/or the execution of arbitrary code on the user's computer.
Symantec has replaced the current ActiveX Control on the Symantec Security Check website so that new visitors will not be affected by the exploit.
Recent visitors to Symantec Security Check should revisit the site and run a new Security Scan. By running a new scan, the previous ActiveX Control will be replaced by an updated ActiveX Control that fixes the buffer overflow condition.
Advanced users can attempt to delete the ActiveX Control by rebooting and then going into the system folder: %SystemRoot%\Downloaded Program Files\ and delete "rufsi.dll". This must be done by using the command prompt and the user must not be on the Symantec Security Check site at the time.
A removal tool has been developed and can be found here.
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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.
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Last modified on: Monday, 25-Oct-04 15:08:25