Atomicorp WAF Rule 340138

Rule Summary

• Rule ID: 340138
• Status: Active
• Alert message: Atomicorp.com WAF Rules: Fake image file shell attack
• Observed CWEs: None documented
• Revision: 4
• Rule severity: Critical (2)
• Phase: 2 (request body)
• Request surfaces: Request body, JSON request data, SOAP request data
• Rule action: deny
• HTTP status: 403
• Logging: log, auditlog

Description

This rule detects non image content on an image file. This method is sometimes used to hide shells and other unauthorized files as image files.

False Positives

There are no known false positives for this rule. It is not recommended that you disable this rule if you have a false positive. If you believe this is a false positive, please report this to our security team to determine if this is a legitimate case, or if its clever attack on your system. Instructions to report false positives are detailed on the Reporting False Positives wiki page. If it is a false positive, we will fix the issue in the rules and get a release out to you promptly.

Tuning Guidance

If you know that this behavior is acceptable for your application, you can tune by following the guidance on the Tuning the Atomicorp WAF Rules page.

Similar Rules

WAF_340140

Selected Related CVEs

This is a selected list of documented research observations, not an exhaustive coverage matrix. Absence of a CVE does not imply absence of protection.

Documentation Source

• Original wiki page: WAF 340138
• Source revision: 1719
• Source revision date: 2011-07-20