From owner-freebsd-security Tue Feb 5 16:24:59 2002 Delivered-To: freebsd-security@freebsd.org Received: from mirage.nlink.com.br (mirage.nlink.com.br [200.249.195.3]) by hub.freebsd.org (Postfix) with SMTP id 6029637B434 for ; Tue, 5 Feb 2002 16:24:54 -0800 (PST) Received: (qmail 39965 invoked from network); 6 Feb 2002 00:24:50 -0000 Received: from foker.nlink.com.br (200.249.197.10) by mirage.nlink.com.br with SMTP; 6 Feb 2002 00:24:50 -0000 Date: Tue, 5 Feb 2002 22:24:24 -0200 (BRST) From: Paulo Fragoso To: Subject: Auditing Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-security@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org Hi, We have a client which was using 4.2-RELEASE and telnetd enabled. In that machine was running an ircd installed and started by a hacker, probaly exploiting telnetd hole. We have instaled 4.5-RELEASE using another HD and log_vain="YES" in the rc.conf. Some time after that upgrade, someone try to connect in this machine: Connection attempt to UDP mmm.mmm.mmm.mmm:22 from hhh.hhh.hhh.hhh:1384 How can we found in the old system all mechanism to enable remotely ircd or backdoor? Are there any rootkit which it has a backdoor at UDP port 22? Paulo. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message