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GHSA-36hh-x5p5-jgc8
No affected components available
Impact
The two parsers resolved duplicates inconsistently and silently:
Content.disposition()retained the last occurrence of each parameter.Content.type()retained the first occurrence of charset and boundary.
Either behavior creates a parameter-smuggling primitive when another component in the request-processing chain (a WAF, reverse proxy, security filter, or alternate parser) resolves duplicates the opposite way. The primary attack vector is upload filename allowlist bypass:
Content-Disposition: form-data; name="file"; filename="safe.txt"; filename="shell.php"
Patches
The issue has been patched in 6.0.2.
Workarounds
Pre or post validate headers looking for duplicates.
Resources
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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