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Old 12-10-2004, 05:38 AM   #1
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Registered: May 2003
Location: Jakarta, Indonesia
Distribution: RedHat, Slackware
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[help - emergency] linux sending arp flood

dear friends,

i need help ......

i have a linux server, as internet sharing server. i use redhat, kernel 2.4.7-10, i think it is redhat.. whether redhat 7 or redhat 8.

currently i do the masquerade, ip_forward and a few rule to filtering the input and output packet.

a few days a go, my network was attack with some kind of problem, cssrnn.exe, do you know what virus or threat is that ? because i still got problem with this cssrnn.

this cssrnn file.. will broadcasting and flooding the arp request... to all over the network... and it might infect other workstations too.

now.. it is infecting my linux server too.
when i'm turn on the iptables, to masquerade, it start to broadcast the arp packet .....

hmm is there any solution.. for this problem...
can any one help ?? coz its eating my bandwith....

thanks before....
Old 12-10-2004, 01:25 PM   #2
Registered: Oct 2004
Location: Queen Charlotte B. C. Canada
Distribution: openSUSE 11.1
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Google has 28 maches for "cssrnn.exe" none in english as yet.

On tranlating one of them came across this line
process://C:\WINDOWS\System32\cssrnn.exe - Exploit:Win32/RpcDcom.gen! - > Infected
Try scearching for "RpcDcom".

Looks like a bad worm and any thing that can be infect already is.

It is unlikly that your Linux is infected, just all those windows machines behind it.

Last edited by m_shroom; 12-10-2004 at 01:48 PM.
Old 12-10-2004, 01:36 PM   #3
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Registered: Mar 2003
Distribution: Fedora
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Could you also provide tcpdump output? It would be rather odd to see a cross-platform worm that affects both linux and windows (assuming the LAN clients are windows). Also could you post the output of lsof -i as well as verify your current ARP table corresponds to the correct host -> mac mappings (list contents of arp table with arp -a). If you have Antivirus on the LAN hosts, then run a scan and see what it finds.


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