HP-UX Apache Server Suite running Apache Tomcat or PHP, Remote Denial of Service (DoS) and Other Vulnerabilities
Description:
The mod_headers module in the Apache HTTP Server 2.2.22 allows remote attackers to bypass "RequestHeader unset" directives by placing a header in the trailer portion of data sent with chunked transfer coding. NOTE: the vendor states "this is not a security issue in httpd as such."