SonicWall Pro DoS

2007.10.25
Credit: Greg Smith
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 7.8/10
Impact Subscore: 6.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Complete

Came across an apparent problem on a SonicWall Pro running firmware version 6.4.0.1 ROM version 5.0.1.0 during a vulnerability assessment and couldn't find any other postings on this problem so fwiw.. the problem occurs when sending a large HTTP POST to the inside interface - may affect others just didn't test as the outside interface was blocked. I was able to confirm this problem using two separate Nessus plugins (10012 and 10687). The behavior of the firewall suggests a buffer overflow but since I'm not familiar with the internals of this system it's just a guess. 15- 20 seconds after sending the POST to the firewall the firewall goes through a reset cycle. This delay suggests to me a section of code that is being overwritten. At the very least, this is a Denial of Service problem. Vendor was notified of the problem.


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