CVE-2020-11076: HTTP Smuggling via Transfer-Encoding Header in Puma
First published: Fri May 22 2020(Updated: )
### 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)
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| rubygems/puma | >=4.0.0<4.3.4 | 4.3.4 |
| rubygems/puma | <3.12.5 | 3.12.5 |
| Puma Puma | >=3.0.0<3.12.6 | |
| Puma Puma | >=4.0.0<4.3.5 | |
| Fedoraproject Fedora | =33 | |
| Debian Debian Linux | =9.0 | |
| ubuntu/puma | <3.12.4-1ubuntu2+ | 3.12.4-1ubuntu2+ |
| debian/puma | 3.12.0-2+deb10u2 3.12.0-2+deb10u3 4.3.8-1 4.3.8-1+deb11u2 5.6.5-3 6.4.2-4 |
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Reference Links
- https://github.com/puma/puma/security/advisories/GHSA-x7jg-6pwg-fx5h
- https://github.com/puma/puma/commit/f24d5521295a2152c286abb0a45a1e1e2bd275bd
- https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22
- https://nvd.nist.gov/vuln/detail/CVE-2020-11076
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/
- https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2020-11076.yml
- https://github.com/advisories/GHSA-x7jg-6pwg-fx5h (Advisory)
- https://launchpad.net/bugs/cve/CVE-2020-11076
- https://security-tracker.debian.org/tracker/CVE-2020-11076
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR/
- https://ubuntu.com/security/notices/USN-6682-1
- https://www.cve.org/CVERecord?id=CVE-2020-11076
- https://ubuntu.com/security/CVE-2020-11076
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2020-11076.
What is the severity of CVE-2020-11076?
The severity of CVE-2020-11076 is high, with a severity value of 7.5.
How can an attacker exploit CVE-2020-11076?
An attacker can exploit CVE-2020-11076 by using an invalid transfer-encoding header to smuggle an HTTP response.
Which versions of Puma are affected by CVE-2020-11076?
Puma versions 3.0.0 to 3.12.5 and 4.0.0 to 4.3.4 are affected by CVE-2020-11076.
How can I fix CVE-2020-11076?
You can fix CVE-2020-11076 by updating Puma to version 3.12.5 or 4.3.4, depending on the version you are currently using.
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