Security - 4 – Serendipity

Serendipity 1.6.1 has just been released. As usual you can simply download from s9y.org, extract the archive, upload it to your webspace and accept the upgrader when visiting your blog.

This release mainly addresses two security issues found by Stefan Schurtz (thanks a lot, again!). One is a XSS issue in the media database panel, the other an SQL injection in the media database section. Both issues can only be exploited if you are logged in to your blog and you click a specially crafted link. The SQL injection cannot be used to extract sensitive information from the database or delete data.

Either way you are urged to upgrade your Blog to the latest version. Development versions of 2.0 and 1.7 on github have these bugs fixed as well.

Other bugfixes in this version include:

• Updated spamblock plugin for better wordfiltering on specific scenarios
• Fixed draft/future entries preview links in backend
• Fixed an issue where template-specific configuration options were not overwritten by the new global ones

You might also want to check out our quite stable 1.7 development version which uses Smarty3, or even our 2.0 development version which contains major rewrites so that Smarty is used in the backend!

MustLive discovered a HTML-injection vulnerability in the tagcloud.swf Flashfile that the Freetag-Plugin bundles and makes optionally available.

The issue is fixed in version 1.23 of the flashfile, which has now been committed to the Serendipity plugin (in version 3.30).

Since the swf-File is always bundled with the update, it is recommended to update to the latest version of the plugin for all users, or to delete that specific .swf file.

Thanks to MustLive for sharing the information with us.

Thanks to Stefan Schurtz, who reported a XSS issue in the serendipity_event_freetag plugin (SSCHADV2011-004). The issue was fixed in version 3.22 of the plugin, you can fetch the update through Spartacus or download via Spartacus.s9y.org.

The bug was introduced in version 3.20 of the plugin. Users of the plugin should upgrade, as it allows malicious users to trick people into visiting a specially crafted link on your blog to steal cookie login information for example, if you click on such a link.

Serendipity bundles the powerful Xinha WYSIWYG editor to provide its functionality to our users.

Xinha ships with several plugins that utilize PHP scripting for special usage, like the ImageManager or ExtendedFileManager. A 0-day security exploit has been reported available as of today that exploits the functionality of these plugins to upload malicious files to your webspace, to execute foreign code.

Since no official patch has been made on the Xinha side, the Serendipity Team has released an updated version where those active Xinha-Plugins are no longer executable.

If you do not wish to apply the patch to the most recent Serendipity version 1.5.5 you can remove those files:

• htmlarea/contrib/php-xinha.php
• htmlarea/plugins/ExtendedFileManager/config.inc.php
• htmlarea/plugins/FormOperations/formmail.php
• htmlarea/plugins/HtmlTidy/html-tidy-logic.php
• htmlarea/plugins/ImageManager/config.inc.php
• htmlarea/plugins/InsertPicture/InsertPicture.php
• htmlarea/plugins/InsertSnippet/snippets.php
• htmlarea/plugins/SpellChecker/aspell_setup.php
• htmlarea/plugins/SpellChecker/spell-check-logic.php
• htmlarea/plugins/SuperClean/tidy.php

The provided functionality is usually not enabled by default, since Serendipity provides its own media file manager.

Future serendipity releases might re-enable these features, once they are safely patched.

To see if you are infected, please check the directories htmlarea/plugins/ImageManager/demo_images and htmlarea/plugins/ExtendedFileManager/demo_images to see if files have been uploaded there. If so, delete the files and check your webspace for other modified files, as well as change your passwords for FTP and SQL access. Please upgrade as soon as possible.

The release can be found on the Serendipity Download page. All serendipity versions from 1.4 to 1.6 (alpha) are affected. 1.6 alpha users should migrate to a recent SVN head checkout or tomorrow's snapshot.

Thanks a lot to Hauser & Wenz for reporting the issue. Serendipity fully acknowledges responsible full disclosure, non-reported 0-day exploits are helping nobody of true OpenSource spirit.

Serendipity 1.5.4 has been released and addresses some minor bugfixes as well as a XSS security issue discovered and reported by High-Tech Bridge. The XSS is only exploitable though, if you are using the "Remember me" feature in the Serendipity backend to login. Thanks to the quick notification by the team we were able to fix the issue within 24 hours, as with all past security issues.

The XSS-issue can easily be patched by only replace the file include/functions_config.inc.php with the new file (link), or by applying this patch.

Other bugfixes that come with the new Serendipity 1.5.4 release are:

• Fix PHP 5.3.2 parse error in a file, thanks to fyremoon
• Fix SQL query statement for deleting a category, which on some DB types (SQlite) might not return "true" and thus not really delete the category.
• Include license output in plugin listing
• Fix escaping when using ImageMagick to create PDF-thumbnail images
• Add new template variable to feed*.tpl files to support new plugins like pubsubhubbub, so that plugins can embed data to the main XML element

The latest release can be found on our SourceForge repository and on the usual place on . To upgrade from any previous Serendipity version, simply extract and upload the new files to your server.

Serendipity 1.5.3 has been released, as a security-fix release with no other relevant changes.

A security issue has been discovered by Stefan Esser during the course of the Month of PHP Security. This issue was found in the WYSIWYG-Library Xinha (that Serendipity uses), and affects certain plugins to Xinha (Linker, ImageManager, ExtendedFileManager, InsertSnippet) which can use a dynamic configuration loader. This loader allows to upload file with arbitrary PHP-Code and thus allows remote code execution, even when not logged in to the Xinha/Serendipity backend.

Due to the seriousness of this bug, we urge everyone to upgrade their installations. People who don't want the hassle of a full upgrade and are not using the mentioned Xinha-plugins actively, can simply delete the file htmlarea/contrib/php-xinha.php, which will render the mentioned plugins and exploits useless.

Thanks to Stefan Esser for reporting this issue to us, and making a quick bugfix possible.