(Trustix Issues Fix) Re: ProFTPD ASCII Mode File Upload Buffer Overflow Lets Certain Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1007832 |
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SecurityTracker URL: http://securitytracker.com/id/1007832
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CVE Reference:
CAN-2003-0831
(Links to External Site)
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Date: Sep 30 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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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:
Trustix has issued a fix, available at:
http://www.trustix.net/pub/Trustix/updates/
Users of the SWUP tool can update automatically using 'swup --upgrade'.
The MD5sums of the packages are:
429165d5e6335e8ee002184ae91d3fa9 ./1.2/RPMS/proftpd-1.2.8-10tr.i586.rpm
ffc555898ba64d98ccdbc63965ebb5b8 ./1.2/SRPMS/proftpd-1.2.8-10tr.src.rpm
0f8bb15841f731d1e8871d2c12736680 ./1.5/RPMS/proftpd-1.2.8-10tr.i586.rpm
ffc555898ba64d98ccdbc63965ebb5b8 ./1.5/SRPMS/proftpd-1.2.8-10tr.src.rpm
6656d385bc41273678a4b426fb4ba2db ./2.0/RPMS/proftpd-1.2.8-9tr.i586.rpm
842153ad2b1a982568af28c5be0ff2be ./2.0/SRPMS/proftpd-1.2.8-9tr.src.rpm
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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 (Trustix)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Mon, 29 Sep 2003 04:19:48 +0200
Subject: TSLSA-2003-0037 - proftpd
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
- --------------------------------------------------------------------------
Trustix Secure Linux Security Advisory #2003-0037
Package name: proftpd
Summary: remote exploit if upload enabled
Date: 2003-09-27
Affected versions: TSL 1.2, 1.5, 2.0
- --------------------------------------------------------------------------
Package description:
ProFTPd is an enhanced FTP server with a focus toward simplicity,
security, and ease of configuration. It features a very Apache-like
configuration syntax, and a highly customizable server infrastructure,
including support for multiple 'virtual' FTP servers, anonymous FTP, and
permission-based directory visibility.
Problem description:
An error exists in the ASCII upload handling of Proftpd version 1.2.7
and later that can be used to trigger an buffer overflow and thus
execute arbitrary code. This has now been fixed.
Action:
We recommend that all systems with this package installed be upgraded.
Please note that if you do not need the functionality provided by this
package, you may want to remove it from your system.
Location:
All TSL updates are available from
<URI:http://www.trustix.net/pub/Trustix/updates/>
<URI:ftp://ftp.trustix.net/pub/Trustix/updates/>
About Trustix Secure Linux:
Trustix Secure Linux is a small Linux distribution for servers. With focus
on security and stability, the system is painlessly kept safe and up to
date from day one using swup, the automated software updater.
Automatic updates:
Users of the SWUP tool can enjoy having updates automatically
installed using 'swup --upgrade'.
Public testing:
These packages have been available for public testing for some time.
If you want to contribute by testing the various packages in the
testing tree, please feel free to share your findings on the
tsl-discuss mailinglist.
The testing tree is located at
<URI:http://www.trustix.net/pub/Trustix/testing/>
<URI:ftp://ftp.trustix.net/pub/Trustix/testing/>
You may also use swup for public testing of updates for TSL 2.0 and later:
site {
class = 0
location = "http://snow.trustix.org/cloud/rdfs/latest.rdf"
regexp = ".*"
}
Questions?
Check out our mailing lists:
<URI:http://www.trustix.net/support/>
Verification:
This advisory along with all TSL packages are signed with the TSL sign key.
This key is available from:
<URI:http://www.trustix.net/TSL-GPG-KEY>
The advisory itself is available from the errata pages at
<URI:http://www.trustix.net/errata/trustix-1.2/>,
<URI:http://www.trustix.net/errata/trustix-1.5/> and
<URI:http://www.trustix.net/errata/trustix-2.0/>
or directly at
<URI:http://www.trustix.net/errata/misc/2003/TSL-2003-0037-proftpd.asc.txt>
MD5sums of the packages:
- --------------------------------------------------------------------------
429165d5e6335e8ee002184ae91d3fa9 ./1.2/RPMS/proftpd-1.2.8-10tr.i586.rpm
ffc555898ba64d98ccdbc63965ebb5b8 ./1.2/SRPMS/proftpd-1.2.8-10tr.src.rpm
0f8bb15841f731d1e8871d2c12736680 ./1.5/RPMS/proftpd-1.2.8-10tr.i586.rpm
ffc555898ba64d98ccdbc63965ebb5b8 ./1.5/SRPMS/proftpd-1.2.8-10tr.src.rpm
6656d385bc41273678a4b426fb4ba2db ./2.0/RPMS/proftpd-1.2.8-9tr.i586.rpm
842153ad2b1a982568af28c5be0ff2be ./2.0/SRPMS/proftpd-1.2.8-9tr.src.rpm
- --------------------------------------------------------------------------
Trustix Security Team
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