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Pagsalakay ng Spam sa WP Trackback

Abe Olandres Editor-in-chief April 9, 2008 · 2 min read

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Sinasabi na kung mas sikat ka, mas marami kang mga atake. Napakalagom nito sa WordPress ngayon. Ang malaking code injection at nakatagong link sa WordPress blogs ay nakatanggap ng seryosong balita, at ngayong gabi lamang ay natuklasan ko ang isa pang anyo ng atake -- ang pagbaha ng WP Trackback Spam.

Ang pagsalakay ay simpleng ngunit epektibo -- punuin ang wp-trackback.php ng mga kahilingan sa HTTP. Parang isang DDOS nga ito. Maaaring may ilang paraan upang gawin ito:

Naka-drive ng software. Nakita ko ang ilang mga software na kaya gumawa ng 1,000 sabay-sabay na HTTP request sa isang site o partikular na webpage.
Kodigo na naka-embed. Idagdag ang target na page (sa kasong ito, wp-trackback.php) sa isang popular na page o site na humihingi dito sa bawat pag-load ng pahina. I-replicate iyan sa maraming ibang mataas na traffic na sites at viola, agad na slashdot effect.
Mga bot. Katulad ng GoogleBot o Yahoo! Metacrawler pero ang mga uri na ito ay may malisyosong layunin lamang na tumutok sa isang partikular na page -- wp-trackback.php.

Mahirap talaga. Kinailangan kong mag-monitor ng isa sa aming mga server na tinargetan ng isang blog nang humigit-kumulang 6 oras. Mukhang Digg-effect o slashdot effect ang pagsalakay. Gayunpaman, walang anti-Digg solutions ang gumagana — kahit ang WP-SuperCache ay hindi nakapagpigil dito. Biglang napagtanto ko na baka hindi naman ika-cached ang pahina.

Ang isang pagsusuri sa mga analityka ay nagpakita ng sumusunod:

wordpress trackback

Pinagbabantayan nito ang WP-Shortstats. Libu-libong hiling sa trackback para sa halos lahat ng pahina sa blog sa loob lamang ng ilang oras.

Ang nagpapalala ay ang wp-shortstats plugin na dinidiretso rin ito — ibig sabihin, para sa bawat paghingi ng pahina, may korespondiyenteng SQL query na isinasagawa ng Shortstats na nagpapakasakit sa sitwasyon.

Ano ang solusyon? Ang pag-deactivate ng trackbacks ay hindi makakatulong. Kailangan mong alisin ang wp-trackback.php o i-CHMOD ito sa 000. Kung kayang kilalanin ang IP, ipag-block din sila.

Hindi makapagpadala o tumanggap ng mga legit na trackback ang iyong blog, pero ito lang ang solusyon para sa ngayon.

What is a WP Trackback Spam attack?

It floods wp-trackback.php with HTTP requests, similar to a DDOS attack.

Why did WP-SuperCache fail to stop the attack?

The trackback page was not being cached, so caching solutions could not fend it off.

How did the wp-shortstats plugin worsen the attack?

It recorded each trackback request, adding extra server load for every page request.

React to this article:

attack flood hack pingback spam trackback

Abe Olandres

Editor-in-chief

Abe is the founder and Editor-in-Chief of YugaTech with over 20 years of experience in the technology industry. He is one of the pioneers of blogging in the country and is considered by many as the Father of Tech Blogging in the Philippines.

8,012 Articles

View all posts by Abe Olandres →

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Bernhard · 17 years ago

After using WP-reCAPTCHA I’ve minized the numbers of SPAM. Still remaining trackbacks – sometimes hundreds per day.

Deleting those trackbacks could be simple. But you have to differentiate: there are trackbacks coming form websides you would like to discuss with, there are trackbacks from pharmacy and sex you begin to hate.

I would like to know a tool you add the IP address and a trackback of this IP will no longer be shown.

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Showbiz Intriga? Get It From Boy! · 18 years ago

OMG! i believe this is culprit, that’s why last month my host server to crash several times and my blog too..

CHMOD to 000?is it just like deleting the wp.trackback thing??

SELaplana · 18 years ago

i don’t know if my selaplana.com experience this. i tried to investigate but i don’t know yet how to know if the blog has been attacked by this kind.

ash · 18 years ago

oh!.. still great it’s fixed… thanks.

Abe Olandres Editor-in-chief · 18 years ago

@ash, that’s the only way I was able to detect the attack. caused the server to slow down and crash at times. Looks like your blog is on that server too.