CVE-2013-7177: Input Validation
config/filter.d/cyrus-imap.conf in the cyrus-imap 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 cyrus-imap filter (config/filter.d/cyrus-imap.conf)to a version that resolves this vulnerability.Fixed in 0.8.11
Event History
Frequently Asked Questions
What is the severity of CVE-2013-7177?
CVE-2013-7177 has a severity rating that can vary by environment, but it is generally considered a medium-risk vulnerability due to its potential for arbitrary IP blocking.
How do I fix CVE-2013-7177?
To resolve CVE-2013-7177, upgrade Fail2ban to version 0.8.11 or later, where the issue has been patched.
Who is affected by CVE-2013-7177?
CVE-2013-7177 affects Fail2ban versions prior to 0.8.11, specifically those vulnerable implementations that include the cyrus-imap configuration.
What impact does CVE-2013-7177 have on users?
CVE-2013-7177 can lead to a denial of service where remote attackers can block any IP address by exploiting the flawed regular expression.
Is there a workaround for CVE-2013-7177 before upgrading?
As a temporary workaround for CVE-2013-7177, you can modify the filtering rules in the cyrus-imap.conf file to mitigate the risk until an upgrade is performed.