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Fail2ban Denial of Service Vulnerability
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Secunia Advisory:
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SA23237
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Release Date:
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2006-12-06
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Last Update:
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2007-08-16
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Popularity:
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5,668 views
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Critical:
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Moderately critical
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Impact:
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DoS
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Fail2ban 0.x
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| CVE reference: | CVE-2006-6302
CVE-2007-4321
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Description:
Tavis Ormandy has discovered a vulnerability in Fail2ban, which can be exploited by malicious people to cause a DoS (Denial of Service).
The vulnerability is caused due to an error in the parsing of log files before adding an IP to the block list. This can be exploited to add arbitrary IP addresses to the block list resulting in a DoS for that IP.
The vulnerability is confirmed in version 0.6.1 and 0.8.0 using "hosts.deny". Other versions may also be affected.
Solution:
Update to version 0.8.1.
http://sourceforge.net/project/showfi...ckage_id=132537&release_id=532238
Provided and/or discovered by:
Tavis Ormandy
Changelog:
2006-12-08: Added CVE reference.
2006-12-15: Updated "Solution" section.
2007-06-07: Updated "Description" and "Solution" section and "Solution Status" based on information provided by Daniel Cid. Added link to "Original Advisory" section.
2007-08-15: Updated "Solution" section.
2007-08-16: Added CVE reference.
Original Advisory:
http://bugs.gentoo.org/show_bug.cgi?id=157166
http://www.ossec.net/en/attacking-loganalysis.html
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About this Secunia Advisory
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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