Fw: PHP Resource Exhaustion Denial of Service

Nice day indeed :) ----- Original Message ----- From: "Matthew Murphy" <mattmurphy@kc.rr.com> To: "BugTraq" <bugtraq@securityfocus.com>; "SecurITeam News" <news@securiteam.com>; "Full Disclosure" <full-disclosure@lists.netsys.com> Sent: Sunday, July 21, 2002 3:45 AM Subject: PHP Resource Exhaustion Denial of Service > The PHP interpreter is a heavy-duty CGI EXE (or SAPI module, depending on > configuration) that implements an HTML-embedded script language. A > vulnerability in PHP can be used to cause a denial of service in some cases. > > PHP's install process on Apache requires a "/php/" alias to be created, as > it resolves CGI paths to a virtual. (e.g, /php/php.exe not C:\php\php.exe). > > To solve the obvious security vulnerability posed by allowing PHP to run > from the web, the development team added a cgi.force_redirect option that is > enabled by default in Apache. > > However, regardless of the force_redirect value, it is still possible to > load the binary without a script path: > > (e.g, http://localhost/php/php) > > A problem exists in PHP; specifically, it does not terminate when given no > command-line arguments. A consistent flow of requests like the above will > exhaust all resources for CGI/ASAPI on the server. > > Exploit: http://www.murphy.101main.net/php-apache.c > > I tried to make sure this would run on Linux/BSD, but no guarantees... > Compiles cleanly on WinMe with MSVC 6.0. > > >