PT-2009-3023 · Fail2Ban · Fail2Ban

Chris Butler · Published 2009-02-13 · Updated 2009-02-13 · CVE-2009-0362

Positive Technologies (AI Summary)

CVSS v2.0

4.0

Medium

Base vector

AV:N/AC:L/Au:S/C:N/I:N/A:P

Name of the Vulnerable Software and Affected Versions Fail2ban version 0.8.3

Description The issue arises from an incorrect regular expression used in the filter.d/wuftpd.conf file, allowing remote attackers to cause a denial of service by forcing authentication failures. This can be achieved through a crafted reverse-resolved DNS name (rhost) entry that contains a substring interpreted as an IP address.

Recommendations For Fail2ban version 0.8.3, update the filter.d/wuftpd.conf file with a corrected regular expression to prevent the exploitation of this issue. As a temporary workaround, consider restricting access to the affected configuration file to minimize the risk of exploitation.

Exploit

Fix

Improper Authentication

Weakness Enumeration

CWE-287

Related Identifiers

CVE-2009-0362

Affected Products

Fail2Ban

References · 7

• 🔥 http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=514163 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2009-0362 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2009-0362 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2009-0362 · Security Note
• http://secunia.com/advisories/33890 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2009-0362 · Vendor Advisory
• http://securityfocus.com/bid/33734 · Note