Vulnerability Description
In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This is a similar but different vulnerability from CVE-2020-11076. The problem has been fixed in Puma 3.12.6 and Puma 4.3.5.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Puma | Puma | >= 3.0.0, < 3.12.6 |
| Fedoraproject | Fedora | 33 |
| Debian | Debian Linux | 9.0 |
| Opensuse | Leap | 15.1 |
Related Weaknesses (CWE)
References
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.htmlMailing ListThird Party Advisory
- https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05Release Notes
- https://github.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxmVendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.htmlMailing ListThird Party Advisory
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.htmlMailing ListThird Party Advisory
- https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05Release Notes
- https://github.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxmVendor Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00009.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
FAQ
What is CVE-2020-11077?
CVE-2020-11077 is a vulnerability with a CVSS score of 6.8 (MEDIUM). In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connectio...
How severe is CVE-2020-11077?
CVE-2020-11077 has been rated MEDIUM with a CVSS base score of 6.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-11077?
Check the references section above for vendor advisories and patch information. Affected products include: Puma Puma, Fedoraproject Fedora, Debian Debian Linux, Opensuse Leap.