Vulnerability CVE-2020-11076
Published: 2020-05-22

Description:
In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.

Type:

CWE-444

 (Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling'))

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
PUMA -> PUMA 

 References:
https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22
https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd
https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h
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