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CVE-2009-0362

4.0 · MEDIUM

filter.d/wuftpd.conf in Fail2ban 0.8.3 uses an incorrect regular expression that allows remote attackers to cause a denial of service (forced authentication failures) via a crafted reverse-resolved…

Published Feb 13, 2009fail2banCWE-287EPSS 1.30%

Overview

CVE-2009-0362 is a medium-severity vulnerability affecting fail2ban fail2ban. It was published on February 13, 2009 and has a CVSS 2.0 base score of 4.0 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 4.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

filter.d/wuftpd.conf in Fail2ban 0.8.3 uses an incorrect regular expression that allows remote attackers to cause a denial of service (forced authentication failures) via a crafted reverse-resolved DNS name (rhost) entry that contains a substring that is interpreted as an IP address, a different vulnerability than CVE-2007-4321.

Remediation

Check the references section for vendor advisories and patches from fail2ban. Update fail2ban to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus

References

Refbugs.debian.org/cgi-bin/bugreport.cgi?bug=514163Refsecunia.com/advisories/33890Refwww.securityfocus.com/bid/33734Refbugs.debian.org/cgi-bin/bugreport.cgi?bug=514163Refsecunia.com/advisories/33890Refwww.securityfocus.com/bid/33734

How CyberStrike helps

Frequently asked questions

What is CVE-2009-0362?

CVE-2009-0362 is a medium-severity vulnerability affecting fail2ban fail2ban. It was published on February 13, 2009 and has a CVSS 2.0 base score of 4.0 (MEDIUM).

How severe is CVE-2009-0362?

This vulnerability has a CVSS 2.0 base score of 4.0, rated MEDIUM. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2009-0362?

Check the references section for vendor advisories and patches from fail2ban. Update fail2ban to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-0362?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-0362 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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