Vulnerability identifier: #VU43223

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2012-5642

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 read and manipulate data.

server/action.py in Fail2ban before 0.8.8 does not properly handle the content of the matches tag, which might allow remote attackers to trigger unsafe behavior in a custom action file via unspecified symbols in this content.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Fail2ban: 0.1.0 - 0.8.7

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External links
http://lists.opensuse.org/opensuse-updates/2013-04/msg00001.html
http://lists.opensuse.org/opensuse-updates/2013-04/msg00002.html
http://sourceforge.net/mailarchive/message.php?msg_id=30193056
http://www.mandriva.com/security/advisories?name=MDVSA-2013:078
http://www.openwall.com/lists/oss-security/2012/12/17/2
http://bugs.gentoo.org/show_bug.cgi?id=447572
http://bugzilla.redhat.com/show_bug.cgi?id=887914
http://github.com/fail2ban/fail2ban/commit/83109bc
http://raw.github.com/fail2ban/fail2ban/master/ChangeLog

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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.