CVE-2019-16770: Potential DOS attack in Puma
First published: Thu Dec 05 2019(Updated: )
A flaw was found in rubygem-puma. A poorly-behaved client could use keepalive requests to monopolize Puma's reactor and create a denial of service attack. If more keepalive connections to Puma are opened than there are threads available, additional connections will wait permanently if the attacker sends requests frequently enough.
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Puma Puma | >=3.0.0<3.12.2 | |
| Puma Puma | >=4.0.0<4.3.1 | |
| Debian Debian Linux | =9.0 |
Remedy
Reverse proxies in front of Puma could be configured to always allow less than X keepalive connections to a Puma cluster or process, where X is the number of threads configured in Puma's thread pool.
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2019-16770 https://nvd.nist.gov/vuln/detail/CVE-2019-16770 https://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994
- https://bugzilla.redhat.com/show_bug.cgi?id=1831297
- https://access.redhat.com/security/cve/CVE-2019-16770
- https://github.com/puma/puma/security/advisories/GHSA-7xx3-m584-x994
- https://github.com/puma/puma/commit/06053e60908074bb38293d4449ea261cb009b53e
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1831306
- https://lists.debian.org/debian-lts-announce/2022/05/msg00034.html
Frequently Asked Questions
What is CVE-2019-16770?
CVE-2019-16770 is a vulnerability found in the rubygem-puma library, which allows a poorly-behaved client to create a denial of service attack by monopolizing Puma's reactor using keepalive requests.
How does CVE-2019-16770 affect the rubygem-puma library?
CVE-2019-16770 affects versions 3.12.2 and 4.3.1 of the rubygem-puma library.
What is the severity of CVE-2019-16770?
CVE-2019-16770 has a severity level of high.
How can the CVE-2019-16770 vulnerability be fixed?
To fix the CVE-2019-16770 vulnerability, update to version 3.12.2 or 4.3.1 of the rubygem-puma library.
What is the Common Weakness Enumeration (CWE) ID for CVE-2019-16770?
The Common Weakness Enumeration (CWE) ID for CVE-2019-16770 is CWE-770.
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