CVE-2023-37897

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Summary

CVECVE-2023-37897
StatePUBLIC
Assigner[email protected]
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-07-18 21:15:00 UTC
Updated2023-07-28 22:24:00 UTC
DescriptionGrav is a file-based Web-platform built in PHP. Grav is subject to a server side template injection (SSTI) vulnerability. The fix for another SSTI vulnerability using `|map`, `|filter` and `|reduce` twigs implemented in the commit `71bbed1` introduces bypass of the denylist due to incorrect return value from `isDangerousFunction()`, which allows to execute the payload prepending double backslash (`\\`). The `isDangerousFunction()` check in version 1.7.42 and onwards retuns `false` value instead of `true` when the `\` symbol is found in the `$name`. This vulnerability can be exploited if the attacker has access to: 1. an Administrator account, or 2. a non-administrator, user account that has Admin panel access and Create/Update page permissions. A fix for this vulnerability has been introduced in commit `b4c6210` and is included in release version `1.7.42.2`. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Risk And Classification

Problem Types: CWE-74

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Getgrav Grav 1.7.42 All All All
Application Getgrav Grav 1.7.42.1 All All All

References

ReferenceSourceLinkTags
SSTI attack mitigation - GHSA-9436-3gmp-4f53 · getgrav/grav@b4c6210 · GitHub MISC github.com
more SSTI fixes in Utils::isDangerousFunction() · getgrav/grav@71bbed1 · GitHub MISC github.com
Server-side Template Injection (SSTI) mitigation bypass via incorrect filtering of double backslash · Advisory · getgrav/grav · GitHub MISC github.com
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