Vulnerability in Getgrav Grav
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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.028 (86.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 86th percentile — 86.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.028 · newest: 0.028 · change: 0.000
Affected products
- Getgrav Grav — versions 1.7.42.1, 1.7.42, < 1.7.42.2
Weakness classification (CWE)
References
- github.com/getgrav/grav/security/advisories/GHSA-9436-3gmp-4f53 (Exploit, Mitigation, Vendor Advisory)
- github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b (Product)
- github.com/getgrav/grav/commit/b4c62101a43051fc7f5349c7d0a5b6085375c1d7 (Patch)
Frequently asked questions
- What is CVE-2023-37897?
- CVE-2023-37897 is a high-severity vulnerability in Getgrav Grav, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 7.2/10. Published 2023-07-18.
- How severe is CVE-2023-37897?
- High severity. CVSS v3 base score is 7.2 out of 10.