OWASP CRS: Whitespace padding in filenames bypasses file upload extension checks

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.

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N

大小写敏感处理不恰当

OWASP CRS 安全漏洞

OWASP CRS是CRS Project开源的一套攻击检测规则集。 OWASP CRS 3.3.9之前版本和4.25.0之前版本存在安全漏洞，该漏洞源于文件扩展名检查未规范化空格，可能导致绕过文件上传限制。

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