[ale] SIP attack

[Chuck Payne]

On Thu, Oct 14, 2010 at 3:47 PM, Paul Cartwright <ale at pcartwright.com> wrote:
> justg read this on a fedora list, if anyone runs a VOIP server:
>
> This is off topic, but I thought I should tell people.
>
> This past weekend, I suffered a DOS attack launched against VOIP SIP
> Clients.  The attack came, at different times, from 3 separate IP addresses.
>
> I blocked the IP addresses using IP Tables when I discovered it.
>
> The attack was a bombardment of several hundred SIP REGISTER requests,
> per second, with a user agent of friendly-scanner.
> The attack was a sustained attack over three days.
>
> I contacted my ISP.  They told me they have taken steps.
>
> I contacted 2 of the 3 owners of the offending IP addresses.
> The third owner of the IP address was a job site address in China,
> and I couldn't figure out how to contact them.
>
> In my case, I run the VOIP SIP program, twinkle.
>
> Twinkle started consuming vast amounts of memory, going from a normal 5
> MiB usage to 500-600 MiB usage, before I realized what was happening.
>
> Twinkle attempted to respond to each incoming packet with an outgoing
> SIP error packet.
>
> I posted a message on the yahoo group used by twinkle asking what they
> could do to better handle such an attack.
>
> If you suddenly seem to have memory problems, I suggest running
> something like System Monitor to find out what applications have memory.
>
> I also be on the lookout for unexpectedly high internet traffic.
>
> This message is off-topic, because it is not specific to Fedora.
> I thought it wouldn't hurt to let people know of this type of attack.
> I hope people don't object to this off-topic post.
> --
> Paul Cartwright
> Registered Linux user # 367800
> Registered Ubuntu User #12459
> http://usdebtclock.org/
>
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>

Paul,

Can you give me the ip's so I can block them on my firewall. Thanks.


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