HTTP Smuggling via Transfer-Encoding Header in Puma
### Impact By using an invalid transfer-encoding header, an attacker could [smuggle an HTTP response.](https://portswigger.net/web-security/request-smuggling) Originally reported by @ZeddYu, who has our thanks for the detailed report. ### Patches The problem has been fixed in Puma 3.12.5 and Puma 4.3.4. ### For more information If you have any questions or comments about this advisory: * Open an issue in [Puma](https://github.com/puma/puma) * See our [security policy](https://github.com/puma/puma/security/policy)
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2020-11076US | high7.5 | Exploit | ||
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 P… | ||||
references
External citations — patches, advisories, analysis.
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.htmlWEB
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.htmlWEB
- https://github.com/puma/pumaPACKAGE
- https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22WEB
- https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bdWEB
- https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5hWEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2020-11076.ymlWEB
- https://lists.debian.org/debian-lts-announce/2020/10/msg00009.htmlWEB
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