Fail2ban 0.8.3 improper authentication

CVSS Meta Temp Score
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CTI Interest Score
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4.1$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Fail2ban 0.8.3. Impacted is an unknown function. The manipulation results in improper authentication. This vulnerability is cataloged as CVE-2009-0362. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Fail2ban 0.8.3. Affected is some unknown functionality. The manipulation with an unknown input leads to a improper authentication vulnerability. CWE is classifying the issue as CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. This is going to have an impact on availability. CVE summarizes:

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.

The bug was discovered 02/04/2009. The weakness was shared 02/12/2009 (Website). The advisory is shared for download at securityfocus.com. This vulnerability is traded as CVE-2009-0362 since 01/29/2009. The exploitability is told to be easy. It is possible to launch the attack remotely. A authentication is required for exploitation. There are neither technical details nor an exploit publicly available.

The vulnerability was handled as a non-public zero-day exploit for at least 8 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 36913 (Fedora 10 : fail2ban-0.8.3-18.fc10 (2009-1737)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 116224 (Fedora 9 Update for Fail2ban (FEDORA-2009-1736)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at X-Force (48673), Tenable (36913), SecurityFocus (BID 33734†), OSVDB (51894†) and Secunia (SA33890†). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 36913
Nessus Name: Fedora 10 : fail2ban-0.8.3-18.fc10 (2009-1737)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍
Nessus Port: 🔍

OpenVAS ID: 63407
OpenVAS Name: Fedora Core 9 FEDORA-2009-1736 (fail2ban)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

01/29/2009 🔍
02/04/2009 +6 days 🔍
02/04/2009 +0 days 🔍
02/11/2009 +7 days 🔍
02/12/2009 +1 days 🔍
02/12/2009 +0 days 🔍
02/14/2009 +2 days 🔍
02/23/2009 +9 days 🔍
04/23/2009 +59 days 🔍
03/17/2015 +2154 days 🔍
05/15/2025 +3712 days 🔍

Sourcesinfo

Advisory: securityfocus.com⛔
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2009-0362 (🔍)
GCVE (CVE): GCVE-0-2009-0362
GCVE (VulDB): GCVE-100-46524
X-Force: 48673
SecurityFocus: 33734 - Fail2ban 'wuftpd.conf' Remote Denial of Service Vulnerability
Secunia: 33890
OSVDB: 51894 - Fail2ban - 'wuftpd.conf' Remote Denial of Service Issue
Vulnerability Center: 21027 - Cyril Jaquier Fail2ban 0.8.3 Remote DoS Vulnerability via a Crafted Reverse-Resolved DNS Name, High

Entryinfo

Created: 03/17/2015 16:11
Updated: 05/15/2025 17:28
Changes: 03/17/2015 16:11 (69), 08/28/2019 09:58 (8), 05/15/2025 17:28 (20)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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