[ale] SIP attack
terrorpup at gmail.com
Thu Oct 14 16:09:19 EDT 2010
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
> Ale mailing list
> Ale at ale.org
> See JOBS, ANNOUNCE and SCHOOLS lists at
Also can you for me the message from the Fedora Group, I am not on any
of their mailing list. I like to what they are talking about.
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