Exploitation Summary
EIP tracks 1 public exploit for CVE-2007-4321. PoCs published by Daniel B. Cid.
AI-analyzed exploit summary This exploit demonstrates a denial-of-service vulnerability in Fail2ban by sending a crafted string to an SSH server, causing arbitrary IP addresses to be blocked. The PoC leverages the application's improper validation of authentication-failure messages.
Description
fail2ban 0.8 and earlier does not properly parse sshd log files, which allows remote attackers to add arbitrary hosts to the /etc/hosts.deny file and cause a denial of service by adding arbitrary IP addresses to the sshd log file, as demonstrated by logging in via ssh with a client protocol version identification containing an IP address string, a different vector than CVE-2006-6302.
Exploits (1)
This exploit demonstrates a denial-of-service vulnerability in Fail2ban by sending a crafted string to an SSH server, causing arbitrary IP addresses to be blocked. The PoC leverages the application's improper validation of authentication-failure messages.