CVE-2009-0362 — Improper Authentication in Fail2ban

CWE-287 — Improper Authentication9 documents6 sources
Severity
4.0MEDIUMNVD
OSV6.8
EPSS
0.6%
top 30.74%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Fail2banDebian Fail2ban
Timeline
PublishedFeb 13
Latest updateMay 2

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.

CVSS vector

AV:N/AC:L/C:N/I:N/A:PExploitability: 8.0 | Impact: 2.9

Affected Packages3 packages

▶debiandebian/fail2ban< fail2ban 0.8.3-2sid1 (bookworm)
▶Debianfail2ban/fail2ban< 0.8.3-2sid1+3

🔴Vulnerability Details

2
GHSA
GHSA-rc77-w9xr-6vvf: filter↗2022-05-02
▶
OSV
CVE-2009-0362: filter↗2009-02-13
▶

📋Vendor Advisories

2
Red Hat
fail2ban: remote DoS via crafted domain names↗2009-02-04
▶
Debian
CVE-2009-0362: fail2ban - filter.d/wuftpd.conf in Fail2ban 0.8.3 uses an incorrect regular expression that...↗2009
▶

💬Community

4
Bugzilla
CVE-2009-0362 fail2ban: remote DoS via crafted domain names↗2009-02-13
▶
Bugzilla
CVE-2009-0362 fail2ban: remote DoS via crafted domain names [Fedora 10]↗2009-02-13
▶
Bugzilla
CVE-2009-0362 fail2ban: remote DoS via crafted domain names [Fedora rawhide]↗2009-02-13
▶
Bugzilla
CVE-2009-0362 fail2ban: remote DoS via crafted domain names [Fedora 9]↗2009-02-13
▶
CVE-2009-0362 — Improper Authentication in Fail2ban | cvebase