Input validation error in Fail2ban



| Updated: 2020-08-10
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2013-2178
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Fail2ban
Server applications / IDS/IPS systems, Firewalls and proxy servers

Vendor Fail2ban

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU42618

Risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2013-2178

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The apache-auth.conf, apache-nohome.conf, apache-noscript.conf, and apache-overflows.conf files in Fail2ban before 0.8.10 do not properly validate log messages, which allows remote attackers to block arbitrary IP addresses via certain messages in a request.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Fail2ban: 0.1.0 - 0.8.8

CPE2.3 External links

https://lists.opensuse.org/opensuse-updates/2014-03/msg00021.html
https://www.debian.org/security/2013/dsa-2708
https://www.openwall.com/lists/oss-security/2013/06/13/7
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A17338
https://raw.github.com/fail2ban/fail2ban/master/ChangeLog
https://vndh.net/note:fail2ban-089-denial-service


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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