Rule: -- Sid: 327 -- Summary: This event is generated when a remote command execution exploit against a finger daemon is attempted. -- Impact: Serious. The attacker may be presented with the opportunity to run a command of his choice on the target UNIX system -- Detailed Information: This event is generated when a specific attack against a vulnerable version of the finger daemon is detected. The Finger daemon is used to provide information about users on a UNIX system. It used to be installed and enabled by default on most UNIX/Linux systems. The attack may allow an attacker to execute a command remotely on a target system with the privileges of the user running the "finger" daemon. The user is usually defined in the /etc/inetd.conf file and is commonly designated as "nobody". -- Attack Scenarios: An attacker may try the attack and then executes a command to download a backdoor to the target system. He then connects to the system and may attempt to escalate his privileges by exploiting a local SUID application to gain "root" privileges. -- Ease of Attack: Simple, no exploit software is required, just a specially formatted finger query -- False Positives: None Known -- False Negatives: None Known -- Corrective Action: Disable the finger daemon or limit the addresses that can access the service via firewall or TCP wrappers. -- Contributors: Original rule written by Max Vision <vision@whitehats.com> Snort documentation contributed by Anton Chuvakin <http://www.chuvakin.org> Sourcefire Research Team Nigel Houghton <nigel.houghton@sourcefire.com> -- Additional References: CVE: http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-1999-0152 Arachnids: http://www.whitehats.com/info/IDS380 Bugtraq: http://online.securityfocus.com/bid/2220 --
