- XF Compatibility
- 2.2.x
- Short Description
- Security Fix: Upgrade XenForo to 2.1.15 or 2.2.16 or apply manual patch.
If you are a XenForo Cloud customer, a fix has been rolled out automatically, and no further action is required to address this issue.
If you are running a pre-release version of XenForo 2.3, you should follow the instructions in the announcement thread for the XenForo 2.3.0 Release Candidate 1 release.
The issue relates to a potential cross-site request forgery and code injection vulnerability which could lead to a remote code execution (RCE) or cross-site scripting (XSS) exploit.
XenForo extends thanks to independent security researcher, Egidio Romano (EgiX), working with SSD Secure Disclosure.
We recommend doing a full upgrade to resolve the issue, but a patch can be applied manually to any version. See below for further details.
To patch this issue manually you will need to edit one file manually and upload some changed files.
Find the following line in this file:
PHP:
$parts = explode(':', $string, 3);
Replace that line with the following:
PHP:
if (!$string) return '';
if (strpos($string, ':') === false)
{
$pattern = '#^\\\?'
. str_replace('%s', '([A-Za-z0-9_\\\]+)', preg_quote(ltrim($formatter, '\\')))
. '$#';
if (!preg_match($pattern, $string, $matches))
{
throw new \InvalidArgumentException(sprintf(
'Class %s does not match formatter pattern %s',
$string,
$formatter
));
}
// already a class
return $string;
}
$parts = explode(':', $string, 3);Note: This file cannot be patched automatically as it contains install-specific data. You must apply this change manually to any XenForo installation running XenForo 2.1 or 2.2 to effectively fix the issue.
- Download either 2115-patch.zip (for XenForo 2.1) or 2216-patch.zip (for XenForo 2.2).
- Extract the .zip file
- Upload the contents of the upload directory to the root of your XenForo installation
Step 3: Upload XFMG files (for XenForo Media Gallery customers only)
- Download either xfmg219-patch.zip (for XenForo Media Gallery 2.1) or xfmg226-patch.zip (for XenForo Media Gallery 2.2).
- Extract the .zip file
- Upload the contents of the upload directory to the root of your XenForo installation
