[ SOURCE: http://www.secureroot.com/security/advisories/9735756755.html ]

There is a small bug in PAGELOG.cgi by Metertek (Metertek@yahoo.com) which

allows users to create and view files.



Any file on the system with a '.log' extension readable by the uid/gid of

the webserver can be viewed. In addition, two files with extensions of

'.txt' and '.log' can be created in any directory on the system that is

writable by the web server.

This bug lies in the failure of the script to check for directory

traversal.



Proofs of concept:

Viewing '.log' file:

Create a file 'a.log' in tmp.

http://server/cgi-bin/pagelog.cgi?display=../../../../tmp/a

This will let you view a.log

Creating files:

http://server/cgi-bin/pagelog.cgi?name=../../../../../tmp/blah

This will create blah.txt and blah.log in /tmp/





The script can be found at http://members.nbci.com/metertek/archive/





cheers.

Mark Stratman (count0)

(mstrat1@uic.edu)

http://sporkstorms.org