Title: MRTG CGI Arbitrary File Display Vulnerability
Severity: MODERATE
Description:
Multi Router Traffic Grapher (MRTG) CGI scripts allow display of arbitrary files from the host machine. This can be accomplished by specifying a relative path and file name in a query string passed to the scripts via a properly constructed URL. The scripts reported to be vulnerable include mrtg.cgi, traffic.cgi, 14all-1.1.cgi, and 14all.cgi. An example URL is: http://somehost/mrtg.cgi?cfg=../../../../../../../../etc/passwd. All affected scripts are reportedly exploited with the same query string (i.e., the "cfg=" variable).
This is simply a failure to parse input and ensure that the requested file isn't outside of the web root environment. Files that are not accessible to CGI can not be disclosed; i.e., permissions are not superceded.
Affected Products:
- MRTG Multi Router Traffic Grapher CGI 2.9.17 -unix
- MRTG Multi Router Traffic Grapher CGI 2.9.17 -win32
References:
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