nginx 0day exploit for nginx + fastcgi PHP

[Igor Sysoev]

On Fri, May 21, 2010 at 04:50:26PM -0400, Ian Evans wrote:

> 
> On Fri, May 21, 2010 4:39 pm, Igor Sysoev wrote:
> > On Fri, May 21, 2010 at 03:04:18PM -0400, Ian M. Evans wrote:
> >
> >> On 5/21/2010 2:36 PM, Igor Sysoev wrote:
> >> > On Fri, May 21, 2010 at 02:26:31PM -0400, Ian Evans wrote:
> >> >
> >> >> Is this situation only pertaining to sites that allow uploads from
> >> forms?
> >> >>
> >> >> Going way back to this thread
> >> >> (http://www.ruby-forum.com/topic/145358#645652) in '08, I needed
> >> >> cgi.fix-pathinfo=1 to fix problems with paths and specific
> >> extensionless
> >> >> files I needed run as php.
> >> >>
> >> >> Changing cgi.fix-pathinfo=1 to 0 broke a lot of stuff.
> >> >
> >> > Could you show again how URIs should be mapped to SCRIPT_FILENAME
> >> > and PATH_INFO ? Modern nginx versions support named captures in regex.
> >> >
> >> >
> >>
> >> This is what you came up with in the thread back in '08:
> >>
> >>         location ~ ^/(cr|news|poll|posters|photos|profile|review)(/|$) {
> >> 		 root /usr/local/apache/htdocs;
> >> 		 set  $script_name  $uri;
> >> 		 set  $path_info    "";
> >>
> >> 		 if ($uri ~ ^(/[^/]+)(/.*)) {
> >> 		 set  $script_name  $1;
> >> 		 set  $path_info    $2;
> >> 		 fastcgi_pass 127.0.0.1:10004;
> >> 			 }
> >>         ...
> >>         fastcgi_param  SCRIPT_FILENAME  $document_root$script_name;
> >>         fastcgi_param  PATH_INFO        $path_info;
> >>                }
> >>         location ~ /(cr|news|poll|posters|photos|profile|review)(/|$) {
> >>         root /usr/local/apache/htdocs;
> >>         set  $script_name  $uri;
> >>         set  $path_info    "";
> >>         if ($uri ~
> >> ^(.*/(?:cr|news|poll|posters|photos|profile|review))(/.*)) {
> >>         set  $script_name  $1;
> >>         set  $path_info    $2;
> >>         fastcgi_pass 127.0.0.1:10004;
> >>         }
> >>         ...
> >> fastcgi_param SCRIPT_FILENAME    $document_root$script_name;
> >> fastcgi_param  PATH_INFO        $path_info;
> >> fastcgi_pass 127.0.0.1:10004;
> >>         }
> >>
> >> The two variations were needed to handle when the extensionless php
> >> script file was in the root (example.com/NEWS/2006/1/24) or several
> >> subdirs down (example.com/tiff/2007/1/PHOTOS/16)
> >
> > location ~
> > ^/(?<SN>cr|news|poll|posters|photos|profile|review)(?<PI>/.*$|$) {
> >     root /usr/local/apache/htdocs;
> >     fastcgi_pass   127.0.0.1:10004;
> >     fastcgi_param  SCRIPT_FILENAME  $document_root/$SN;
> >     fastcgi_param  PATH_INFO        $PI;
> > }
> >
> > location ~
> > ^(?<SN>.*/(cr|news|poll|posters|photos|profile|review)(?<PI>/.*$|$) {
> >     root /usr/local/apache/htdocs;
> >     fastcgi_pass   127.0.0.1:10004;
> >     fastcgi_param  SCRIPT_FILENAME  $document_root$SN;
> >     fastcgi_param  PATH_INFO        $PI;
> > }
> >
> 
> And this will work with cgi.fix-pathinfo=0? Just want to confirm since I
> only have my production server to test on. Guess I really need to dig out
> an old computer one day and just set it up as a local test server.

It should work in 0.8.32+.  What nginx version do you use ?
You may create similar locations

location ~ ^/(?<SN>CR|NEWS|...)(?<PI>/.*$|$) {

to test.


-- 
Igor Sysoev
http://sysoev.ru/en/