OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks (coreruleset coreruleset)
En bref
- Source
- NVD
- EPSS
- EPSS 3.84 % · centile 90 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- GitHub_M
- Statut NVD
- Modified
Description
The OWASP core rule set (CRS) is a set of generic attack detection rules for use with compatible web application firewalls. Prior to versions 3.3.9 and 4.25.0, a bypass was identified in OWASP CRS that allows uploading files with dangerous extensions (.php, .phar, .jsp, .jspx) by inserting whitespace padding in the filename (e.g. photo. php or shell.jsp ). The affected rules do not normalize whitespace before evaluating the file extension regex, so the dot-extension check fails to match. This issue has been patched in versions 3.3.9 and 4.25.0.
Faiblesses (CWE)
- CWE-178 — Gestion incorrecte de la casse
Références
- https://github.com/coreruleset/coreruleset/security/advisories/GHSA-rw5f-9w43-gv2w
- https://github.com/coreruleset/coreruleset/pull/4546
- https://github.com/coreruleset/coreruleset/pull/4547
- https://github.com/coreruleset/coreruleset/pull/4548
- https://github.com/coreruleset/coreruleset/commit/2a8c63512811c5dd74472becebb79a783e68ff02
- https://github.com/coreruleset/coreruleset/releases/tag/v3.3.9
- https://github.com/coreruleset/coreruleset/releases/tag/v4.25.0
- http://www.openwall.com/lists/oss-security/2026/03/29/2
- http://seclists.org/fulldisclosure/2026/Apr/0
- http://www.openwall.com/lists/oss-security/2026/04/18/4
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N | GitHub_M |
| CVSS 3.1 | MEDIUM 6.8 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N | NVD · security-advisories@github.com (Secondary) |
| CVSS 3.1 | HIGH 7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N | NVD · nvd@nist.gov (Primary) |
Références européennes
- ENISA EUVD · EUVD-2026-18352
- GCVE · GCVE-0-2026-33691
Avis du CERT-FR
- CERTFR-2026-AVI-0883 — Multiples vulnérabilités dans Progress LoadMaster · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*< 3.3.9cpe:2.3:a:owasp:owasp_modsecurity_core_rule_set:*:*:*:*:*:*:*:*≥ 4.0.0 < 4.25.0
Produits affectés
| Produit | Versions |
|---|---|
| coreruleset · coreruleset | affected < 3.3.9 ; affected >= 4.0.0-rc1, < 4.25.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |