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Advisories

Coraza before 3.8.1 Multipart filename* Charset Handling FILES Rule Bypass

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Severity
medium
Date
Affecting

  • coraza >= 0, < 3.8.1

CWE
  • CWE-20 Improper Input Validation
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N
Credit
airween, janmrow
Description
Coraza before 3.8.1 extracts multipart upload filenames with Go's mime.ParseMediaType, which silently ignores RFC 5987 filename* parameters whose charset is not utf-8 or us-ascii. Unauthenticated attackers can send a decoy filename with filename*=iso-8859-1''shell.php, or filename* alone, so FILES-based rules never see the real name, letting dangerous uploads reach backends that honor filename*.

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