SERVER-WEBAPP -- Snort has detected traffic exploiting vulnerabilities in web based applications on servers.
SERVER-WEBAPP Apache Server mod_proxy Error Page cross site scripting attempt
Apache HTTP Server versions 2.4.0-2.4.39 are vulnerable to a limited cross-site scripting attack via a mod_proxy error page.
What To Look For
This rule will alert when an attempt is made to trigger a Cross-Site Scripting vulnerability on an Apache HTTP server running mod_proxy.
Public information/Proof of Concept available
No known false positives
Cisco Talos Intelligence Group
MITRE ATT&CK Framework
Technique: User Execution
For reference, see the MITRE ATT&CK vulnerability types here:
Cross Site Scripting (XSS)
Cross Site Scripting (XSS) attackers send malicious input to a site that does not validate the input, usually in the form of a script. The application sends the malicious code to the browsers of other users, which will execute the script unknowingly. The malicious code uses the trust of the host website to access cookies, session tokens, or other sensitive information. There are multiple types of XSS, including Stored, Reflected, and DOM based.
CVE Additional Information
CVE-2019-10092In Apache HTTP Server 2.4.0-2.4.39, a limited cross-site scripting issue was reported affecting the mod_proxy error page. An attacker could cause the link on the error page to be malformed and instead point to a page of their choice. This would only be exploitable where a server was set up with proxying enabled but was misconfigured in such a way that the Proxy Error page was displayed.
||Ease of Access||MEDIUM