Dropbear

Category: Software

  • WordPress 5.2.4

    Hot on the heels of WordPress version 5.2.3 which fixed a bunch of stuff we have WordPress 5.2.4 with fixes for six security issues.

    There is a certain trick to matching up what the WordPress Blog thinks has been fixed and the changsets between the old version and the new. The curious thing is there were 6 changsets backported to older versions of WordPress, so you might think “six issues, six changesets, what’s the problem?”. The problem is that two of them fix the same thing (or one sort-of fixed it and the second really did) and another I couldn’t link to any vulnerability, BUT it was to do with directory traversal issue.

    The hardest part of maintaining the Debian WordPress packages is the backporting. Trying to link the changes to the bugs is next to impossible so I generally import all the ones they have in the specific major version and hope for the best. This isn’t ideal, but information about what the actual bugs are and how they are fixed is not forthcoming.

  • WordPress 5.1.1

    The Debian packages for WordPress version 5.1.1 are being updated as I write this. This is a security fix for WordPress that stops comments causing a cross-site scripting bug. It’s an important one to update.

    The backports should happen soon so even if you are using Debian stable you’ll be covered.

  • WordPress 5.0.1

    While I missed the WordPress 5.0 release, it was only a few more days before there was a security release out.

    So WordPress 5.0.1 will be available in Debian soon. This is both a security update from 5.0.1 and a huge feature update from the 4.9.x versions to the 5.0 versions.

    The WordPress website, in their 5.0 announcement describe all the changes better, but one of the main things is the new editor (which I’m using as I write this).  It’s certainly cleaner, or perhaps more sparse. I’m not sure if I like it yet.

    The security fixes (there are 7) are the usual things you expect from a WordPress security update. The usual XSS and permission problems type stuff.

    I have also in the 5.0.1 Debian package removed the build dependency to libphp-phpmailer. The issue with that package is there won’t be any more security updates for the version in Debian. WordPress has an embedded version of it which *I hope* they maintain. There is an issue about the phpmailer in WordPress, so hopefully it gets fixed soon.

  • Odd dependency on Google Chrome

    For weeks I have had problems with Google Chrome. It would work very few times and then for reasons I didn’t understand, would stop working. On the command line you would get several screens of text, but never would the Chrome window appear.

    So I tried the Beta, and it worked… once.

    Deleted all the cache and configuration and it worked… once.

    Every time the process would be in an infinite loop listening to a Unix socket (fd 7) but no window for the second and subsequent starts of Chrome.

    By sheer luck in the screenfulls of spam I noticed this:

    Gkr-Message: 21:07:10.883: secret service operation failed: The name org.freedesktop.secrets was not provided by any .service files

    Hmm, so I noticed every time I started a fresh new Chrome, I logged into my Google account. So, once again clearing things I started Chrome, didn’t login and closed and reopened.  I had Chrome running the second time! Alas, not with all the stuff synchronised.

    An issue for Mailspring put me onto the right path. installing gnome-keyring (or the dependencies p11-kit and gnome-keyring-pkcs11) fixed Chrome.

    So if Chrome starts but you get no window, especially if you use cinnamon, try that trick.

     

     

  • Securing WordPress with AppArmor

    WordPress is a very popular CMS. According to one report, 30% of websites use WordPress, which is an impressive feat.

    Despite this popularity, WordPress is built upon PHP which is often lacking in the security department. Add to this that the user that runs the webserver often has a fair bit of access and there is no distinguishing between the webserver code and the WordPress code and you set yourself up for troubles.

    So, let’s introduce something that not only can tell the difference between Apache running and WordPress running under it, but also limit what WordPress can access.

    As the AppArmor wiki says “AppArmor is Mandatory Access Control (MAC) like security system for Linux. AppArmor confines individual programs to a set of files, capabilities, network access and rlimits…”.  AppArmor also has this concept of hats, so your webserver code (e.g. apache) can be one hat with one policy but the WordPress PHP code has another hat and therefore another policy. For some reason, AppArmor calls a policy a profile, so wherever you see profile translate that to policy.

    The idea here is to limit what WordPress can access down to the files and directories it needs, and nothing more. What follows is how I have setup my system but you may need to tweak it, especially for some plugins.

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  • WordPress 4.9.1

    After a much longer than expected break due to moving and the resulting lack of Internet, plus WordPress releasing a package with a non-free file, the Debian package for WordPress 4.9.1 has been uploaded!

    WordPress 4.9 has a number of improvements, especially around the customiser components so that looked pretty slick. The editor for the customiser now has a series of linters what will warn if you write something bad, which is a very good thing! Unfortunately the Javascript linter is jshint which uses a non-free license which that team is attempting to fix.  I have also reported the problem to WordPress upstream to have a look at.

    While this was all going on, there were 4 security issues found in WordPress which resulted in the 4.9.1 release.

    Finally I got the time to look into the jshint problem and Internet to actually download the upstream files and upload the Debian packages. So version 4.9.1-1 of the packages have now been uploaded and should be in the mirrors soon.  I’ll start looking at the 4.9.1 patches to see what is relevant for Stretch and Jessie.

  • Short Delay with WordPress 4.9

    You may have heard WordPress 4.9 is out. While this seems a good improvement over 4.8, it has a new editor that uses codemirror.  So what’s the problem? Well, inside codemirror is jshint and this has that idiotic no evil license. I think this was added in by WordPress, not codemirror itself.

    So basically WordPress 4.9 has a file, or actually a tiny part of a file that is non-free.  I’ll now have to delay the update of WordPress to hack that piece out, which probably means removing the javascript linter. Not ideal but that’s the way things go.

     

  • psmisc 23.0

    I had to go check but it has been over 3 years since the last psmisc release back in February 2014. I really didn’t think it had been that long ago.  Anyhow, with no further delay, psmisc version 23.0 has been released today!

    Update: 23.1 is out now, removed some debug line out of killall and shipped two missing documents.

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  • The sudo tty bug and procps

    There have been recent reports of a security bug in sudo (CVE-2017-1000367) where you can fool sudo into thinking what controlling terminal it is running on to bypass its security checks.  One of the first things I thought of was, is procps vulnerable to the same bug? Sure, it wouldn’t be a security bypass, but it would be a normal sort of bug. A lot of programs  in procps have a concept of a controlling terminal, or the TTY field for either viewing or filtering, could they be fooled into thinking the process had a different controlling terminal?

    Was I going to be in the same pickle as the sudo maintainers? The meat between the stat parsing sandwich? Can I find any more puns related somehow to the XKCD comic?

    TLDR: No.

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  • WordPress 4.7.2

    When WordPress originally announced their latest security update, there were three security fixes. While all security updates can be serious, they didn’t seem too bad. Shortly after, they updated their announcement with a fourth and more serious security problem.

    I have looked after the Debian WordPress package for a while. This is the first time I have heard people actually having their sites hacked almost as soon as this vulnerability was announced.

    If you are running WordPress 4.7 or 4.7.1, your website is vulnerable and there are bots out there looking for it. You should immediately upgrade to 4.7.2 (or, if there is a later 4.7.x version to that).  There is now updated Debian wordpress version 4.7.2 packages for unstable, testing and stable backports.

    For stable, you are on a patched version 4.1 which doesn’t have this specific vulnerability (it was introduced in 4.7) but you should be using 4.1+dfsg-1+deb8u12 which has the fixes found in 4.7.1 ported back to 4.1 code.