#VU42086 Input validation error in Fail2ban - CVE-2013-7176
Vulnerability identifier: #VU42086
Vulnerability 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-2013-7176
CWE-ID:
CWE-20
Exploitation vector: Network
Exploit availability: No
Vulnerable software:
Fail2ban
Server applications /
IDS/IPS systems, Firewalls and proxy servers
Vendor: Fail2ban
Description
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
config/filter.d/postfix.conf in the postfix filter in Fail2ban before 0.8.11 allows remote attackers to trigger the blocking of an arbitrary IP address via a crafted e-mail address that matches an improperly designed regular expression.
Mitigation
Install update from vendor's website.
Vulnerable software versions
Fail2ban: 0.1.0 - 0.8.9
External links
https://lists.opensuse.org/opensuse-updates/2014-03/msg00021.html
https://www.debian.org/security/2014/dsa-2979
https://www.kb.cert.org/vuls/id/686662
https://github.com/fail2ban/fail2ban/commit/eb2f0c927257120dfc32d2450fd63f1962f38821
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
