CVE-2013-7176: Input Validation
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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Fail2ban (postfix filter config/filter.d/postfix.conf)to a version that resolves this vulnerability.Fixed in 0.8.11
Event History
Frequently Asked Questions
What is the severity of CVE-2013-7176?
CVE-2013-7176 has a medium severity level, allowing remote attackers to manipulate IP blocking.
How do I fix CVE-2013-7176?
To fix CVE-2013-7176, upgrade Fail2ban to version 0.8.11 or later.
What impact does CVE-2013-7176 have on my system?
CVE-2013-7176 could allow malicious users to block arbitrary IP addresses, leading to denial of service.
Which versions of Fail2ban are affected by CVE-2013-7176?
CVE-2013-7176 affects Fail2ban versions prior to 0.8.11, including all versions from 0.1.0 to 0.8.10.
Is CVE-2013-7176 being actively exploited?
There is potential for exploitation of CVE-2013-7176, making it essential to apply the necessary updates.