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