CVE-2023-34448

Summary

Grav is a flat-file content management system. Prior to version 1.7.42, the patch for CVE-2022-2073, a server-side template injection vulnerability in Grav leveraging the default filter() function, did not block other built-in functions exposed by Twig's Core Extension that could be used to invoke arbitrary unsafe functions, thereby allowing for remote code execution. A patch in version 1.74.2 overrides the built-in Twig map() and reduce() filter functions in system/src/Grav/Common/Twig/Extension/GravExtension.php to validate the argument passed to the filter in $arrow.

Affected Software

Weaknesses

• CWE-20: CWE-20: Improper Input Validation
• CWE-1336: CWE-1336: Improper Neutralization of Special Elements Used in a Template Engine

ADP Enrichment

CVE Program Container

Additional References

• https://github.com/getgrav/grav/security/advisories/GHSA-whr7-m3f8-mpm8
• https://github.com/getgrav/grav/commit/8c2c1cb72611a399f13423fc6d0e1d998c03e5c8
• https://github.com/twigphp/Twig/blob/v1.44.7/src/Environment.php#L148
• https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/
• https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

References

• https://github.com/getgrav/grav/security/advisories/GHSA-whr7-m3f8-mpm8
• https://github.com/getgrav/grav/commit/8c2c1cb72611a399f13423fc6d0e1d998c03e5c8
• https://github.com/twigphp/Twig/blob/v1.44.7/src/Environment.php#L148
• https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/
• https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfeb83

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