Red Hat Bugzilla – Bug 1471824
CVE-2017-11143 php: Incorrect WDDX deserialization of boolean parameters leads to DoS
Last modified: 2018-03-12 09:07:39 EDT
In PHP before 5.6.31, an invalid free in the WDDX deserialization of
boolean parameters could be used by attackers able to inject XML for
deserialization to crash the PHP interpreter, related to an invalid
free for an empty boolean element in ext/wddx/wddx.c.
This issue happens when untrusted input is deserialized. Doing so is 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. Use a safe, standard data interchange format such as JSON (via json_decode() and json_encode()) if you need to pass serialized data to the user.