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The vulnerability (CVE-2016-1000005) affects HHVM's mcrypt_get_block_size function, which failed to properly validate the 'module' parameter type. This issue impacts HHVM versions prior to 3.9.5, versions between 3.10.0 and 3.12.3 (inclusive), and versions between 3.13.0 and 3.14.1 (inclusive) (NVD).
The vulnerability stems from a type confusion issue in the mcrypt_get_block_size function, where the function did not enforce string type validation for the 'module' parameter. The severity of this vulnerability is rated as CRITICAL with a CVSS v3.1 base score of 9.8 (Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H). The issue is classified as CWE-843: Access of Resource Using Incompatible Type ('Type Confusion') (NVD).
The vulnerability could potentially lead to type confusion, which might result in high impacts on confidentiality, integrity, and availability of the affected systems. The CVSS scoring indicates potential for complete compromise of system confidentiality, integrity, and availability (NVD).
A patch has been released to fix the parameter types for mcrypt_get_block_size() to match PHP's implementation. Users should upgrade to HHVM version 3.9.5 or later, or if running versions 3.10.0 through 3.14.1, upgrade to versions after 3.12.3 or 3.14.1 respectively (HHVM Patch).
Source: This report was generated using AI
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