CVE-2023-37897: Grav 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…

PriorityP356high8.8CVSS 3.1

AVNACLPRLUINSUCHIHAH

EPSS

2.26%

80.8th percentile

Grav 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.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
getgrav	grav	< 1.7.42.2	1.7.42.2
getgrav	grav	—	—
getgrav	grav	—	—
getgrav	grav	>= 0 < 1.7.42.2	1.7.42.2

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