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Re: [Request for Testers] CVE-2011-3368 "Reverse Proxy Bypass"
From: Michael Meyer <michael.meyer () greenbone net>
Date: Tue, 11 Oct 2011 15:17:41 +0200

*** Gutek <ange.gutek () gmail com> wrote:

I've found a very few vulnerable ones, and that's not enough to be
confident with this script.
Of course I can't give them here, as I don't want to publicly expose
them: that's why I'm calling for testers (2).

------------------------------------------------------------
Starting Nmap 5.59BETA1 ( http://nmap.org ) at 2011-10-11 14:41 CEST
--------------- Timing report ---------------
  hostgroups: min 1, max 100000
  rtt-timeouts: init 1000, min 100, max 10000
  max-scan-delay: TCP 1000, UDP 1000, SCTP 1000
  parallelism: min 0, max 0
  max-retries: 10, host-timeout: 0
  min-rate: 0, max-rate: 0
---------------------------------------------
NSE: Loaded 1 scripts for scanning.
NSE: Script Pre-scanning.
NSE: Starting runlevel 1 (of 1) scan.
mass_rdns: Using DNS server localhost
mass_rdns: 0.00s 0/1 [#: 1, OK: 0, NX: 0, DR: 0, SF: 0, TR: 1]
DNS resolution of 1 IPs took 0.00s. Mode: Async [#: 1, OK: 0, NX: 1, DR: 0, SF: 0, TR: 1, CN: 0]
Packet capture filter (device lo): dst host 192.168.2.7 and (icmp or icmp6 or ((tcp or udp or sctp) and (src host 
192.168.2.7)))
Overall sending rates: 69.23 packets / s, 3046.04 bytes / s.
NSE: Script scanning 192.168.2.7.
NSE: Starting runlevel 1 (of 1) scan.
NSE: Starting http-reverseproxy-bypass against 192.168.2.7:80.
NSE: Total number of pipelined requests: 3
NSE: Number of requests allowed by pipeline: 100
NSE: Received only 3 of 100 expected responses.
Decreasing max pipelined requests to 3.
NSE: Number of received responses: 3
NSE: http-reverseproxy-bypass : test 1 returned a 200
NSE: http-reverseproxy-bypass : CHRONO 404: 0
NSE: http-reverseproxy-bypass : CHRONO REQUEST: 30
NSE: http-reverseproxy-bypass : test 2 returned a 200
NSE: http-reverseproxy-bypass : CHRONO 404: 0
NSE: http-reverseproxy-bypass : CHRONO REQUEST: 30
NSE: http-reverseproxy-bypass : test 3 returned a 200
NSE: http-reverseproxy-bypass : CHRONO 404: 0
NSE: http-reverseproxy-bypass : CHRONO REQUEST: 30
NSE: Finished http-reverseproxy-bypass against 192.168.2.7:80.
Nmap scan report for 192.168.2.7
Host is up (0.000049s latency).
Scanned at 2011-10-11 14:41:39 CEST for 95s
PORT   STATE SERVICE
80/tcp open  http
|_http-reverseproxy-bypass: NOT found vulnerable to CVE-2011-3368, but allows requests to external websites
Final times for host: srtt: 49 rttvar: 5000  to: 100000

NSE: Script Post-scanning.
NSE: Starting runlevel 1 (of 1) scan.
Read from /opt/nmap/bin/../share/nmap: nmap-payloads nmap-services.
Nmap done: 1 IP address (1 host up) scanned in 95.20 seconds
------------------------------------------------------------

mime () kira[13]: ~ 0)$ netstat -n | grep 10\\.
tcp        0      1 192.168.2.7:45166       10.0.0.61:80            SYN_SENT

if reference.status and chrono_request > (chrono_404+1) then -- vulnerable if we get an error status after a 
consequent delay

I guess, that reference.status is not true, if the response take longer than
the 30 second timeout?

mime () kira[18]: ~ 0)$ date
Di 11. Okt 14:57:39 CEST 2011
           ^^^^^^^^
mime () kira[18]: ~ 0)$ telnet 192.168.2.7 80
Trying 192.168.2.7...
Connected to 192.168.2.7.
Escape character is '^]'.
GET @10.10.10.10 HTTP/1.0


[Tue Oct 11 15:01:01 2011] [error] (110)Connection timed out: proxy: HTTP: attempt to connect to 10.10.10.10:80 (*) 
failed
            ^^^^^^^^
I have to wait ~3 minutes for a response if the host is in an other network. 

HTH

Micha 

-- 
Michael Meyer                            OpenPGP Key: 52A6EFA6
http://www.greenbone.net/
Greenbone Networks GmbH, Neuer Graben 17, 49074 Osnabrück | AG
Osnabrück, HR B 202460
Geschäftsführer: Lukas Grunwald, Dr. Jan-Oliver Wagner
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