Fail2ban postfix and cyrus-imap filters contain denial-of-service vulnerabilities

Overview

Fail2ban versions prior to 0.8.11 are susceptible to a denial-of-service attack when a maliciously crafted email address is parsed by the postfix or cyrus-imap filters. If users have not deployed either of these filters then they are not affected.

Description

Fail2ban versions prior to 0.8.11 are susceptible to a denial-of-service attack when a maliciously crafted email address is parsed by the postfix or cyrus-imap filters. An attacker can cause arbitrary IP addresses to be blocked by fail2ban.

CVE-2013-7177: cyrus-imap
<https://github.com/fail2ban/fail2ban/commit/bd175f026737d66e7110868fb50b3760ff75e087&gt;

CVE-2013-7176: postfix
<https://github.com/fail2ban/fail2ban/commit/eb2f0c927257120dfc32d2450fd63f1962f38821&gt;

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Impact

A remote unauthenticated attacker may cause arbitrary IP addresses to be blocked by Fail2ban causing legitimate users to be blocked from accessing services protected by Fail2ban.

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Solution

Apply an Update

Fail2Ban 0.8.11 addresses these vulnerabilities. Users are advised to upgrade to Fail2ban 0.8.11 or later.

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Vendor Information

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Fail2ban Affected

Updated: January 23, 2014

Status

Affected

Vendor Statement

We have not received a statement from the vendor.

Vendor Information

We are not aware of further vendor information regarding this vulnerability.

CVSS Metrics

Group	Score	Vector
Base	7.8	AV:N/AC:L/Au:N/C:N/I:N/A:C
Temporal	6.4	E:F/RL:OF/RC:C
Environmental	4.8	CDP:ND/TD:M/CR:ND/IR:ND/AR:ND

References

• <http://www.fail2ban.org>
• <https://github.com/fail2ban/fail2ban/commit/bd175f026737d66e7110868fb50b3760ff75e087&gt;
• <https://github.com/fail2ban/fail2ban/commit/eb2f0c927257120dfc32d2450fd63f1962f38821&gt;

Acknowledgements

Thanks to Steven Hiscocks for reporting this vulnerability.

This document was written by Jared Allar.

Other Information

CVE IDs:	CVE-2013-7176, CVE-2013-7177
Date Public:	2014-01-20 Date First Published: