CVE-2023-34253 — Grav is a flat-file content management system
Grav is a flat-file content management system. 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 un
Published
2023-06-14T22:00:12.569Z
Last modified
2024-12-18T21:39:39.981Z
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
01What is this vulnerability?
Grav is a flat-file content management system. 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…
02Affected products
| Vendor | Product | Versions |
|---|
| getgrav | grav | < 1.7.42 |
03Active exploitation status
Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.
04Recommended remediation
- Patch to a fixed version listed in the vendor advisory (see references below).
- Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
- Hunt historical logs for exploitation indicators — see Detection signatures below.
05Technical details
For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.
06Detection signatures
Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.
07Related CVEs
No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.
08Timeline
- Published: 2023-06-14T22:00:12.569Z
- Last modified: 2024-12-18T21:39:39.981Z
09References
- github.com — https://github.com/getgrav/grav/security/advisories/GHSA-j3v8-v77f-fvgm
- github.com — https://github.com/getgrav/grav/commit/71bbed12f950de8335006d7f91112263d8504f1b
- github.com — https://github.com/getgrav/grav/blob/1.7.40/system/src/Grav/Common/Utils.php#L19…
- huntr.dev — https://huntr.dev/bounties/3ef640e6-9e25-4ecb-8ec1-64311d63fe66/
- www.github.com — https://www.github.com/getgrav/grav/commit/9d6a2dba09fd4e56f5cdfb9a399caea355bfe…
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