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GLSA 200403-08: oftpd DoS vulnerability
Posted by Philipp Esselbach on: 03/29/2004 09:45 AM [ Print | 0 comment(s) ]
An oftpd security update for Gentoo Linux has been released
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Gentoo Linux Security Advisory GLSA 200403-08
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http://security.gentoo.org
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Severity: Normal
Title: oftpd DoS vulnerability
Date: March 29, 2004
Bugs: #45738
ID: 200403-08
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Synopsis
=======
A remotely-exploitable overflow exists in oftpd, allowing an attacker to crash the oftpd daemon.
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Gentoo Linux Security Advisory GLSA 200403-08
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
http://security.gentoo.org
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal
Title: oftpd DoS vulnerability
Date: March 29, 2004
Bugs: #45738
ID: 200403-08
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
=======
A remotely-exploitable overflow exists in oftpd, allowing an attacker to crash the oftpd daemon.
Background
=========
Quote from http://www.time-travellers.org/oftpd/
"oftpd is designed to be as secure as an anonymous FTP server can possibly be. It runs as non-root for most of the time, and uses the Unix chroot() command to hide most of the systems directories from external users - they cannot change into them even if the server is totally compromised! It contains its own directory change code, so that it can run efficiently as a threaded server, and its own directory listing code (most FTP servers execute the system "ls" command to list files)."
Affected packages
================
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Package / Vulnerable / Unaffected
-------------------------------------------------------------------
net-ftp/oftpd <= 0.3.6 >= 0.3.7
Description
==========
Issuing a port command with a number higher than 255 causes the server to crash. The port command may be issued before any authentication takes place, meaning the attacker does not need to know a valid username and password in order to exploit this vulnerability.
Impact
=====
This exploit causes a denial of service.
Workaround
=========
While a workaround is not currently known for this issue, all users are advised to upgrade to the latest version of the affected package.
Resolution
=========
All users should upgrade to the current version of the affected package:
# emerge sync
# emerge -pv ">=net-ftp/oftpd-0.3.7"
# emerge ">=net-ftp/oftpd-0.3.7"
References
=========
[ 1 ] http://www.time-travellers.org/oftpd/oftpd-dos.html
Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.
=========
Quote from http://www.time-travellers.org/oftpd/
"oftpd is designed to be as secure as an anonymous FTP server can possibly be. It runs as non-root for most of the time, and uses the Unix chroot() command to hide most of the systems directories from external users - they cannot change into them even if the server is totally compromised! It contains its own directory change code, so that it can run efficiently as a threaded server, and its own directory listing code (most FTP servers execute the system "ls" command to list files)."
Affected packages
================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
net-ftp/oftpd <= 0.3.6 >= 0.3.7
Description
==========
Issuing a port command with a number higher than 255 causes the server to crash. The port command may be issued before any authentication takes place, meaning the attacker does not need to know a valid username and password in order to exploit this vulnerability.
Impact
=====
This exploit causes a denial of service.
Workaround
=========
While a workaround is not currently known for this issue, all users are advised to upgrade to the latest version of the affected package.
Resolution
=========
All users should upgrade to the current version of the affected package:
# emerge sync
# emerge -pv ">=net-ftp/oftpd-0.3.7"
# emerge ">=net-ftp/oftpd-0.3.7"
References
=========
[ 1 ] http://www.time-travellers.org/oftpd/oftpd-dos.html
Concerns?
========
Security is a primary focus of Gentoo Linux and ensuring the confidentiality and security of our users machines is of utmost importance to us. Any security concerns should be addressed to security@gentoo.org or alternatively, you may file a bug at http://bugs.gentoo.org.
