Red Hat Bugzilla – Bug 1305559
php: Type confusion vulnerability in WDDX packet deserialization
Last modified: 2017-09-07 17:04:22 EDT
A type confusion vulnerability in WDDX packet deserialization was reported.
Created php tracking bugs for this issue:
Affects: fedora-all [bug 1305565]
This issue happens when untrusted input is unserialized. Doing so it documented as being unsafe:
Do not pass untrusted user input to wddx_deserialize(). Unserialization
can result in code being loaded and executed due to object instantiation
and autoloading, and a malicious user may be able to exploit this.
Affected code is part of the WDDX extension. In Red Hat products, this extension is packaged in the php-xml subpackages. Systems without php-xml installed can not be affected by this issue. If system requires one of the other extensions packaged in php-xml packages, but not the WDDX extension, it is possible to prevent PHP from loading the extension by commenting out the following line in the wddx.ini configuration file:
The configuration file can be found in the php.d configuration directory. Depending on whether PHP packages from Red Hat Enterprise Linux or Red Hat Software Collections are used, php.d directory can be found in one of the following locations: /etc, /opt/rh/<collection>/root/etc/, or /etc/opt/rh/<collection>/.