ProFTPD ASCII Mode File Upload Buffer Overflow Lets Certain Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1007794
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CVE Reference: CAN-2003-0831
(Links to External Site)
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Updated: Sep 26 2003
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Original Entry Date: Sep 23 2003
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Impact: Execution of arbitrary code via network, Root access via network
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Fix Available: Yes
Vendor Confirmed: Yes
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Advisory: Internet Security Systems (X-Force)
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Version(s): Confirmed on 1.2.7, 1.2.8, 1.2.8rc1, 1.2.8rc2, 1.2.9rc1, and 1.2.9rc2
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Description: A buffer overflow vulnerability was reported in the ProFTPD FTP server. A remote user with upload privileges may be able to obtain root access on the target system.
Internet Security Systems reported that there is a flaw in the processing of inbound ASCII file transfers. A remote user with upload
privileges can upload a specially crafted file in ASCII mode and then attempt to download the file to trigger the buffer overflow
and execute arbitrary code. The remote user can bypass ProFTPD security checks to cause the code to execute with root level privileges,
the report said.
According to the report, the flaw resides in the translation of newline characters.
The CVE number CAN-2003-0831
has been assigned to this issue.
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Impact: A remote user with file upload privileges can execute arbitrary code on the target system with root privileges.
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Solution: The vendor has issued a fixed version (1.2.9rc2p), available at:
ftp://ftp.proftpd.org/distrib/source/proftpd-1.2.9rc2p.tar.gz
ftp://ftp.proftpd.org/distrib/source/proftpd-1.2.9rc2p.tar.bz2
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Vendor URL: www.proftpd.org/ (Links to External Site)
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Cause: Boundary error
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Underlying OS: Linux (Any), UNIX (Any)
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Reported By: X-Force <xforce@iss.net>
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Message History:
This archive entry has one or more follow-up message(s) listed below.
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Source Message Contents
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Date: Tue, 23 Sep 2003 10:53:26 -0400 (EDT)
From: X-Force <xforce@iss.net>
Subject: ISS Security Brief: ProFTPD ASCII File Remote Compromise Vulnerability
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-----BEGIN PGP SIGNED MESSAGE-----
Internet Security Systems Security Brief
September 23, 2003
ProFTPD ASCII File Remote Compromise Vulnerability
Synopsis:
ISS X-Force has discovered a flaw in the ProFTPD Unix FTP server. ProFTPD
is a highly configurable FTP (File Transfer Protocol) server for Unix
that allows for per-directory access restrictions, easy configuration of
virtual FTP servers, and support for multiple authentication mechanisms.
A flaw exists in the ProFTPD component that handles incoming ASCII file
transfers.
Impact:
An attacker capable of uploading files to the vulnerable system can
trigger a buffer overflow and execute arbitrary code to gain complete
control of the system. Attackers may use this vulnerability to destroy,
steal, or manipulate data on vulnerable FTP sites.
Affected Versions:
ProFTPD 1.2.7
ProFTPD 1.2.8
ProFTPD 1.2.8rc1
ProFTPD 1.2.8rc2
ProFTPD 1.2.9rc1
ProFTPD 1.2.9rc2
Note: Versions previous to version 1.2.7 may also be vulnerable.
For the complete ISS X-Force Security Advisory, please visit:
http://xforce.iss.net/xforce/alerts/id/154
______
About Internet Security Systems (ISS)
Founded in 1994, Internet Security Systems (ISS) (Nasdaq: ISSX) is a
pioneer and world leader in software and services that protect critical
online resources from an ever-changing spectrum of threats and misuse.
Internet Security Systems is headquartered in Atlanta, GA, with
additional operations throughout the Americas, Asia, Australia, Europe
and the Middle East.
Copyright (c) 2003 Internet Security Systems, Inc. All rights reserved
worldwide.
Permission is hereby granted for the electronic redistribution of this
document. It is not to be edited or altered in any way without the
express written consent of the Internet Security Systems X-Force. If you
wish to reprint the whole or any part of this document in any other
medium excluding electronic media, please email xforce@iss.net for
permission.
Disclaimer: The information within this paper may change without notice.
Use of this information constitutes acceptance for use in an AS IS
condition. There are NO warranties, implied or otherwise, with regard to
this information or its use. Any use of this information is at the
user's risk. In no event shall the author/distributor (Internet Security
Systems X-Force) be held liable for any damages whatsoever arising out
of or in connection with the use or spread of this information.
X-Force PGP Key available on MIT's PGP key server and PGP.com's key server,
as well as at http://www.iss.net/security_center/sensitive.php
Please send suggestions, updates, and comments to: X-Force
xforce@iss.net of Internet Security Systems, Inc.
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