Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') in puma

Impact

Prior to version 6.3.1, puma exhibited incorrect behavior when parsing chunked transfer encoding bodies and zero-length Content-Length headers in a way that allowed HTTP request smuggling.

The following vulnerabilities are addressed by this advisory:

• Incorrect parsing of trailing fields in chunked transfer encoding bodies
• Parsing of blank/zero-length Content-Length headers\r\n

Patches

The vulnerability has been fixed in 6.3.1 and 5.6.7.

Workarounds

No known workarounds.

References

HTTP Request Smuggling