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Advisories

Grav < 2.0.4 ReDoS via regex_replace in Sandbox

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severity
medium
date
Affecting

  • grav >= 0, < 2.0.4

CWE
  • CWE-1333 Inefficient Regular Expression Complexity
CVSS
6
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Credit
gemstone-source, drpr0grammer
Description
Grav before 2.0.4 contains a regular expression denial of service (ReDoS) vulnerability in the regex_replace filter and function, which are allowlisted in the Twig content sandbox. When Twig processing in page content is enabled (security.twig_content.process_enabled: true, disabled by default), an authenticated page editor can supply a catastrophically backtracking PCRE pattern that is passed directly to PHP's preg_replace(), causing unbounded CPU consumption and denial of service to the web server process.

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