CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3	$0-$5k	0.00

A vulnerability was found in fail2ban 0.8. It has been rated as critical. This issue affects some unknown processing. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6302.

The bug was discovered 06/06/2007. The weakness was presented 06/06/2007 (Website). It is possible to read the advisory at ossec.net. The identification of this vulnerability is CVE-2007-4321 since 08/13/2007. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 25809 , which helps to determine the existence of the flaw in a target environment. It is .

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at X-Force (34757) and Tenable (25809). See 33638, 38305 and 38304 for similar entries.

Productinfo

Name

• fail2ban

Version

• 0.8

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

VulDB CVSS-B Score: 🔍
VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock
unlock	unlock	unlock	unlock	unlock	unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	unlock	unlock	unlock	unlock
Today	unlock	unlock	unlock	unlock

Nessus ID: 25809
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Port: 🔍

OpenVAS ID: 60133
OpenVAS Name: Debian Security Advisory DSA 1456-1 (fail2ban)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

06/06/2007 🔍
06/06/2007 +0 days 🔍
06/06/2007 +0 days 🔍
07/28/2007 +52 days 🔍
08/13/2007 +16 days 🔍
08/13/2007 +0 days 🔍
11/29/2007 +108 days 🔍
01/14/2008 +45 days 🔍
03/16/2015 +2618 days 🔍
07/21/2021 +2319 days 🔍

Sourcesinfo

Advisory: ossec.net
Status: Not defined

CVE: CVE-2007-4321 (🔍)
OVAL: 🔍

X-Force: 34757
Vulnerability Center: 17350 - Fail2ban Improper SSH Log Files Parsing Allows Remote Attackers to Execute Code and Cause DoS, Critical
SecurityFocus: 25117 - Fail2ban Remote Denial of Service Vulnerability
Secunia: 23237
OSVDB: 42484 - Fail2ban Crafted Client Version sshd Log File Parsing Arbitrary Host Addition DoS

See also: 🔍

Entryinfo

Created: 03/16/2015 12:18
Updated: 07/21/2021 14:49
Changes: 03/16/2015 12:18 (66), 08/03/2019 15:22 (3), 07/21/2021 14:49 (3)
Complete: 🔍

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