10010.txt

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Rule: 

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Sid: 
10010

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Summary: 
This event is generated when an attempt is made to exploit a known vulnerability in Putty.

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Impact: 
Serious. Execution of code by an unauthorized attacker is possible.

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Detailed Information:
Putty is vulnerable to a buffer overflow during the server key exchange initialization when performed as part of the server's "hello" packet.  This vulnerability causes a null pointer dereference in the basic case and arbitrary code execution in a more sophisticated attack.

The vulnerability is triggered by sending more than 20232 bytes as part of the key exchange.

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Affected Systems:
PuTTy versions 0.53 and prior

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Attack Scenarios: 
An attacker would need to supply more than 20232 bytes to the client connecting to the server during the key exchange.

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Ease of Attack: 
Simple. Exploit code exists.

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False Positives:
None known.

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False Negatives:
None known.

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Corrective Action: 
Apply the appropriate vendor supplied patches.

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Contributors:
Sourcefire Vulnerability Research Team
Patrick Mullen
Nigel Houghton

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Additional References:

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