CVE-2023-34253

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Summary

CVECVE-2023-34253
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-06-14 23:15:00 UTC
Updated2023-11-07 04:15:00 UTC
DescriptionGrav is a file-based Web platform. Prior to version 1.7.42, the denylist introduced in commit 9d6a2d to prevent dangerous functions from being executed via injection of malicious templates was insufficient and could be easily subverted in multiple ways -- (1) using unsafe functions that are not banned, (2) using capitalised callable names, and (3) using fully-qualified names for referencing callables. Consequently, a low privileged attacker with login access to Grav Admin panel and page creation/update permissions is able to inject malicious templates to obtain remote code execution. A patch in version 1.7.42 improves the denylist.

Risk And Classification

Problem Types: CWE-94

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Getgrav Grav All All All All

References

ReferenceSourceLinkTags
more SSTI fixes in Utils::isDangerousFunction() · getgrav/grav@71bbed1 · GitHub MISC github.com
Server Side Template Injection vulnerability found in grav MISC huntr.dev
grav/system/src/Grav/Common/Utils.php at 1.7.40 · getgrav/grav · GitHub MISC github.com
Fixed Twig `|filter()` allowing code execution · getgrav/grav@9d6a2db · GitHub MISC www.github.com
Grav Server-side Template Injection (SSTI) via Denylist Bypass Vulnerability · Advisory · getgrav/grav · GitHub MISC github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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