Improper Authentication in Fail2ban - CVE-2009-0362
Published: July 2, 2020
Vulnerability identifier: #VU29490
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2009-0362
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Fail2ban
Fail2ban
Software vendor:
Fail2ban
Fail2ban
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to filter.d/wuftpd.conf in Fail2ban uses 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.
Remediation
Install updates from vendor's website.