This Blog Is Not For Reading

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    • New note by bobjonkman 2 December 2019
      Don't worry about it. I know that's not really helpful advice, but I've had experiences like this too. I think of it as "the wheels falling off". I suspect everyone has these times, but most people won't admit it. An uplifting aphorism I heard in a movie: "It will all be alright in the end. […]
    • New note by bobjonkman 2 December 2019
      These all need illustrations for the box covers.
    • bobjonkman repeated a notice by nev 30 November 2019
      RT @nev i'm well aware canada's healthcare system is vastly inadequate, but just imagine if the housing system were anywhere near what the healthcare system was like. for-profit housing should be as obscene as for-profit healthcare. flipping houses should be seen as as unethical as hiking up insulin prices.
    • Favorite 30 November 2019
      bobjonkman favorited something by nev: i'm well aware canada's healthcare system is vastly inadequate, but just imagine if the housing system were anywhere near what the healthcare system was like. for-profit housing should be as obscene as for-profit healthcare. flipping houses should be seen as as unethical as hiking up insulin prices.
    • New note by bobjonkman 8 November 2019
      Elois and Morlocks, from another work of fiction co-opted into a user manual for the 1%
    • Favorite 8 November 2019
      bobjonkman favorited something by inkslinger: The fan theory that the Jetsons and the Flintstones are actually contemporaneous to one another -- the Jetsons' sky cities being the land of the wealthy (or formerly wealthy, perhaps, since capitalist wage relations still exist, even in a world with literal robot servants) and the Flintstones being the descendants […]
    • bobjonkman repeated a notice by inkslinger 8 November 2019
      RT @inkslinger The fan theory that the Jetsons and the Flintstones are actually contemporaneous to one another -- the Jetsons' sky cities being the land of the wealthy (or formerly wealthy, perhaps, since capitalist wage relations still exist, even in a world with literal robot servants) and the Flintstones being the descendants of the poor […]
    • Favorite 1 November 2019
      bobjonkman favorited something by ericxdu23: Hi. I'm still here.
    • Favorite 1 November 2019
      bobjonkman favorited something by hubert: ♲ @cryptpad@social.weho.st: Exactly 5 years ago at 16:42, was the first CryptPad commit by @cjdelisle, the start of a very ambitious project to restore privacy in collaboration tools. We believed in it 5 years ago and we thank the 200 supporters and 10000 weekly users from 150 countries that have […]
    • New note by bobjonkman 24 October 2019
      Best thread in a long time! nEVILle Park's ( @nev ) #Arachtober: https://social.coop/@nev/102887815460533048

Recovering from a WordPress hack

Posted by Bob Jonkman on 29th October 2013

WordPress logo cleaved by axe

WordPress Hacked!

Last Friday I was finally getting around to upgrading the WordPress installations on the SOBAC server from v3.6 to v3.6.1. Surprise! WordPress v3.7 had just been released the night before!

WordPress upgrades are famous for their ease of installation. Surprise! After upgrading the first installation most of the plugins were missing, and the theme was broken. A quick look at a directory listing showed that the plugins and themes were still installed. A quick look with a text editor showed some peculiar PHP code at the top of every .php file in the plugins folders. Surprise! This WordPress installation had been hacked! Fortunately, of the five instances of WordPress on this server, only two appeared to be affected. This Blog Is Not For Reading was not one of them.

Each .php file started with something like this:

<?php $zend_framework="\x63\162\x65(…)\x6e"; 
@error_reporting(0); 
zend_framework("", "\x7d\7(…)

Injected, obfuscated PHP code at the top of every .php file, referencing the zend_framework

Searching the Internet for “wordpress plugin invalid header zend_framework” I found a reference that makes me think this may have been possible because of a flaw in an earlier version of the WordPress code that handles comments. Most likely one of the comment fields (user name, e-mail, web address or the comment text itself) wasn’t properly sanitized, and allowed some kind of code injection (probably PHP injection, not a MySQL injection; the contents of the databases appeared to be untouched).

From the backups of the server it appeared that the breach occurred in or before August — either just before the release of WordPress 3.6 on 1 August 2013 or just before the release of WordPress 3.6.1 on 11 September 2013. If I had not been slack in upgrading to WP v3.6.1 then this breach might have been identified much sooner.

The upgrade to WordPress identified the modified files because the injected code preceded (and corrupted) the WP headers, and so WP v3.7 disabled any affected plugins and themes.

The Fix Is In

I renamed the directory containing the WordPress code, installed a fresh copy of WP3.7, cleaned and copied the wp-config.php and .htaccess files, uploaded a small image to create the wp-content/uploads hierarchy, then copied the upload folder (which didn’t contain any .php files), and then re-installed and re-configured the themes and plugins directly from the WordPress site.

Aside from the additional PHP code, there didn’t appear to be any other damage to the system. So I used the original wp-config.php (but cleaned, and with the “Authentication Unique Keys and Salts” section refreshed), and the new installation just used the existing databases. If there’s any malcode in the databases then that could re-infect the system, so I’m keeping an eye on it.

I have no idea what the malcode was intended to do. It didn’t corrupt the databases or anything else, but it’s possible it was acting as a keylogger or phoning home some other way. If I feel inclined I might try to de-obfuscate the injected code, but right now I don’t really feel like doing forensics.

Someone suggested using AppArmor to make the WordPress directories read-only. I’m not sure that locking down the WP directory is a good idea. The big new feature in WordPress 3.7 is its automatic update feature. If the WordPress directories are locked down then future security updates won’t be applied automatically. If there is an exploit and WordPress issues a new release to fix it, then a locked-down site will experience a delay in upgrading until the SysAdmin notices and upgrades manually (which is what used to happen before v3.7, but it seems a bad idea to delay upgrades when that’s no longer necessary). Also, the plugin and themes directories would be locked down, and they still require fairly frequent manual upgrades.

I sent the users on the affected sites this message:

While doing upgrades on WordPress yesterday I saw that your blog had been hacked sometime during or before August. I’ve fixed it (re-installed the code, copied your media library, re-installed themes and plugins). I don’t think any damage was done beyond the insertion of malicious code in some of the WordPress files. I don’t know what the action of that code was intended to be, but you should change your WordPress password just in case the bad guys captured it. You can change your password on the “Users, Your Profile page” once you’ve logged in.

After spending some time on Saturday fixing the two hacked WordPress sites I’m a little paranoid, and making sure to implement updates quickly. But a little paranoia is good — it’ll ensure I won’t become complacent again.

–Bob.

WordPress Hacks by Rafael Poveda is used under a CC BY-NC-SACreative Commons — Attribution-NonCommercial-ShareAlike — CC BY-NC-SA license.

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Posted in code, How To, security, System Administration | Comments Off on Recovering from a WordPress hack

Ubuntu 13.04 Raring Ringtail Release Parties on Thursday, 25 April

Posted by Bob Jonkman on 22nd April 2013

Ubuntu Tri-leaf logo

The KW chapter of Ubuntu Canada is having a release party for the latest version of Ubuntu, named “Raring Ringtail” on Thursday, 25 April 2013 at 7:00pm at the Kwartzlab Makerspace.

You’ll meet Ubuntu people from all over Canada during the IRC meeting from 7:00pm to 8:00pm; the Kwartzlab Radio team will be recording a podcast at 8:30pm; and there will be a live installation demonstration on a fancy new Lenovo laptop with UEFI and SecureBoot. And, of course, there will be cake, deviled eggs, and we may order out for pizza…

What: KW Raring Ringtail Release Party
When: Thursday, 25 April 2013 7:00pm – 10:00pm EDT iCal 1
Where: Kwartzlab, 33 Kent Avenue, Kitchener, Ontario Map 1
Online:
#ubuntu-ca on Freenode Web Chat
Registration: KW Release Party on Ubuntu Canada LoCo Events (Registration is optional, but appreciated)


Ubuntu Canada logoThere is also a Toronto Raring Ringtail Release Party. Join Michael Kaulbach for a bottomless cup of coffee and free Ubuntu cupcakes!

What: Toronto Raring Ringtail Release Party
When: Thursday, 25 April 2013 8:00pm – 11:00pm EDT iCal 2
Where: Alio Lounge, 108 Dundas Street West, Toronto, Ontario Map 2
Online: #ubuntu-ca on Freenode Web Chat
Registration: Toronto Release Party on Ubuntu Canada LoCo Events (Registration is optional, but appreciated)


And there are rumours afoot of a Raring Ringtail Release Party in Guelph. More details as I unearth them….

Updated 26 April 2013: It’s here!

What: Guelph Raring Ringtail Release Party
When: Friday, 10 May 2013 7:00pm to 10:00pm iCal 3
Where: Diyode Community Workshop, Unit B, 71 Wyndham St. S, Guelph, Ontario Map 3
Online: #ubuntu-ca on Freenode Web Chat
Registration: Guelph Raring Ringtail Release Party on Ubuntu Canada LoCo Events

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Posted in FLOSS, GNU/Linux, Operating System, Ubuntu | Comments Off on Ubuntu 13.04 Raring Ringtail Release Parties on Thursday, 25 April

 
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