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Advisories

b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key

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severity
critical
date
Affecting

  • b2evolution CMS >= 6.7.8, <= 7.2.5

CWE
  • CWE-502 Deserialization of Untrusted Data
CVSS
9.2
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Credit
Adrian Gaitan
Description
b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in param_check_serialized_array() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/call_plugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist.

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