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Symantec Security Check ActiveX Remotely Exploitable Buffer Overflow
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Secunia Advisory:
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SA9091
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Release Date:
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2003-06-23
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Last Update:
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2003-06-25
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Popularity:
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8,376 views
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Critical:
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Moderately critical
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Impact:
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System access
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Symantec RuFSI Utility Class / Symantec RuFSI Registry Information Class
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Description:
A vulnerability has been identified in an ActiveX component which is installed and marked as "safe" when using Symantec's online Security Check.
The problem is that the "CompareVersionStrings" function doesn't verify input properly. This allows malicious web sites to activate the ActiveX component and supply very long maliciously crafted strings which possibly could execute arbitrary code.
Because the ActiveX component has been marked as safe, it may be activated by any other web site without warning or prompting the user.
Solution:
Remove "Symantec RuFSI Utility Class" or "Symantec RuFSI Registry Information Class" from your system.
Secunia recommend that ActiveX and scripting is disallowed for all sites. Only allow scripting on a site per site basis.
An updated version of the ActiveX component has been placed on Symantec's web site. However, the kill bit does not seem to be set for the old component. This allows malicious sites to re-install the old vulnerable ActiveX component, because it is digitally signed and marked as safe.
Provided and/or discovered by:
Cesar Cerrudo
Changelog:
2003-06-24 Update to class name, as it may be different depending on if you made an online virus scan or security check first.
2003-06-25 Symantec has released an updated ActiveX. This, however, does not eliminate the vulnerability.
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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