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Advisories

Conditional Fields for Contact Form 7 < 2.7.3 DoS via Uncontrolled Resource Consumption

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severity
high
date
Affecting

  • Conditional Fields for Contact Form 7 < 2.7.3

CWE
  • CWE-1284 Improper Validation of Specified Quantity in Input
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
References
Credit
Rahul Karne
Description
Conditional Fields for Contact Form 7 WordPress plugin through version 2.6.7 contains an uncontrolled resource consumption vulnerability in the Wpcf7cfMailParser class where the hide_hidden_mail_fields_regex_callback() method reads an iteration count directly from user-supplied POST parameters without validation or upper bound enforcement. Unauthenticated attackers can supply an arbitrarily large integer value through the REST API endpoint to cause unbounded loop execution with multiple preg_replace() operations, exhausting server memory and crashing the PHP process.

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