-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Actually, most loopback devices respond to any IP within the 127/8 IP range, because the entire /8 block is reserved for loopback purposes.
The fact that a program is using it isn't a ''bad'' thing, although it is extremely odd. I do have a few concerns though. Is 45.253.14.97 an IP address on the system? If not, you may want to investigate as to why traffic to the loopback subnet is being routed there. Also, f you're running a *NIX varient (Being snort, I guess so)... See if there is a version of a utility called 'lsof' available for your system. What that does is list information about open filedescriptors, including sockets (tcp, udp, unix, etc), pipes, fifos, normal files, and more. The output from that may be able to give you some insight as to what is binding to that port on your system, if indeed anything is. On 15-Jan-2002 Craig Van Tassle wrote: > My loop back is supposed to be 127.0.0.1.. at least that is what my ifconfig > shows me.. and i have no idea what program is running on that port. > Do you think that i could have a possible intrusin? > > Thanks > Craig > > On Tue, Jan 15, 2002 at 10:44:48AM -0800, Glenn Pitcher wrote: >> No, you can't bypass the firewall using the loopback interface. Whats >> interesting though is the IP address they're using... usually loopback is >> 127.0.0.1 and the port number, 5460 isn't assigned to anyone so what program >> is running? >> >> -----Original Message----- >> From: Craig Van Tassle [mailto:[EMAIL PROTECTED]] >> Sent: Monday, January 14, 2002 8:48 AM >> To: secuirty-basics >> Subject: loopback device >> >> >> Is it possible for someone over a network to use my loopback to by pass my >> firewall? If so what can i do to mitigate the problem and how damageing can >> it be? >> >> The reason im asking is my Snort sytem is showing badd loopback traffic.. >> thanks >> >> here is a snipit from my snort logs. >> >> [**] [1:528:2] BAD TRAFFIC loopback traffic [**] >> [Classification: Potentially Bad Traffic] [Priority: 2] >> 01/12-14:10:11.568007 45.253.14.97:49847 -> 127.167.228.85:5460 >> TCP TTL:64 TOS:0x0 ID:37583 IpLen:20 DgmLen:40 >> ******S* Seq: 0x3F4BB00A Ack: 0x0 Win: 0x200 TcpLen: 20 >> >> Thanks >> Craig >> >> - -- Phillip O'Donnell Software Engineer, Esphion Limited [EMAIL PROTECTED] -----BEGIN PGP SIGNATURE----- Version: PGP 6.5.1i iQA/AwUBPEXd7nbXtTBvmfCfEQKNyQCfd08qxIx1+JqoOl47TH/pm74eSRcAoO7g Ky+CD/KuL2KCESveLJw30Gb1 =VjXg -----END PGP SIGNATURE-----
