Macromedia ColdFusion/JRun Remote SYSTEM Buffer Overflow Vulnerabilities

Release Date:
November 12, 2002

Severity:
High (Remote SYSTEM level code execution)

Systems Affected:
Macromedia Coldfusion 6.0 and prior (IIS ISAPI)
Macromedia JRun 4.0 and prior (IIS ISAPI)

Description:
Macromedia JRun and ColdFusion IIS ISAPI handlers contain various heap
overflows when handling URI filenames. By supplying a filename over 4096
bytes in size, heap memory can be overwritten. Various structures can be
overwritten in the process heap to gain control of the remote IIS process
with SYSTEM level access. This makes it rather trivial for attackers to
remotely compromise Microsoft IIS web servers running vulnerable versions of
Macromedia Coldfusion or JRun.

The following requests can be used to duplicate the attack.

For JRun:
telnet example.com 80
GET /[+4096 byte buffer].jsp HTTP/1.0
[enter]
[enter]

For Coldfusion:
telnet example.com 80
GET /[+4096 byte buffer].cfm HTTP/1.0
[enter]
[enter]

During testing, 5000 bytes was sufficient to begin overwriting data
structures that made exploitation straightforward. The vulnerabilities exist
in error handling within the ISAPI filters.

Protection:
eEye Digital Security customers using SecureIIS are protected from the
exploitation of this vulnerability.
http://www.eeye.com/SecureIIS

Vendor Status:
Macromedia has released patches for both the JRun and Coldfusion products.
ColdFusion MX Advisory:
http://www.macromedia.com/v1/handlers/index.cfm?ID=23161
JRun Advisory:
http://www.macromedia.com/v1/handlers/index.cfm?ID=23500

Credit: Riley Hassell, Research Engineer - eEye Digital Security

Greetings: Eli, Kasia, Jenn, Hx2, and the all the crazy kiwi's with hackfu

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