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Computer Associates eTrust InoTask.exe Antivirus Buffer Overflow Vulnerability

05.09.07

BACKGROUND

Computer Associates' eTrust Antivirus is a client antivirus scanner. It is distributed in standalone packages and also as part of the Internet Security Suite. More information can be found on the vendor's website at the following URL.

http://www3.ca.com/solutions/product.aspx?ID=156

DESCRIPTION

Local exploitation of a buffer overflow vulnerability in Computer Associates International Inc.'s (CA) eTrust Antivirus allows attackers to execute arbitrary code with SYSTEM privileges.

The Task Service component of eTrust Antivirus, InoTask.exe, is used to schedule and execute tasks such as scanning the system for virii. The service uses a shared file mapping to share information about scheduled tasks. The file mapping has a NULL security descriptor, which allows any user to modify its contents. By modifying a string inside of this mapping an attacker can trigger a stack based overflow in the InoTask process.

ANALYSIS

Exploitation allows an attacker to elevate privileges to SYSTEM on the targeted host.

A local user account is required to exploit this vulnerability; it can not be triggered remotely.

When exploiting this vulnerability, an attacker can cause the copy operation to write past the end of the stack. This triggers an exception, and results in execution of attacker supplied code when calling the SEH function.

DETECTION

iDefense confirmed that CA eTrust Antivirus r8 on Windows is vulnerable.

WORKAROUND

iDefense is currently unaware of any workarounds for this issue.

VENDOR RESPONSE

"CA has issued an update to address the vulnerabilities. The patched files are available as part of the product's automatic content update."

For more information consult Computer Associates' Security Notice at the following URL.

http://supportconnectw.ca.com/public/antivirus/infodocs/caav-secnotice050807.asp

CVE INFORMATION

The Common Vulnerabilities and Exposures (CVE) project has assigned the name CVE-2007-2523 to this issue. This is a candidate for inclusion in the CVE list (http://cve.mitre.org/), which standardizes names for security problems.

DISCLOSURE TIMELINE

02/07/2007 Initial vendor notification
02/07/2007 Initial vendor response
05/09/2007 Coordinated public disclosure

CREDIT

This vulnerability was reported to iDefense by binagres.

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LEGAL NOTICES

Copyright © 2007 Verisign, Inc.

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