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The risk of unserializing attacker-controlled data in PHP has been well known since Stefan Essar first
presented the issue in detail in 2009[1]. This topic is closely associated with similar vulnerabilities in
other languages (see CWE-502[2] and CWE-915[3]). Recent years have also seen several vulnerabilities
in the native code implementing unserialization (CVE-2017-12934, CVE-2017-12933, CVE-2017-
12932 et al.) further demonstrating the risk of exposing unserialization to attacker-controlled data.
This paper will present a novel attack technique specific to PHP which can cause unserialization to
occur in a variety of exploitation scenarios. The technique can be used when an XXE vulnerability
occurs, as well as such circumstance that would typically be considered an SSRF vulnerability and in a
number of other scenarios where the vulnerability would previously have been considered an
information disclosure issue.
