CVE-2020-11077: Puma HTTP Smuggling Vulnerability
MODERATECVE-2020-11077 is a MODERATE (CVSS 6.8) http smuggling vulnerability (CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')) affecting Puma libraries in the RubyGems ecosystem. The issue involves http smuggling via transfer-encoding header in puma. Remediation is available by upgrading affected packages to version 3.12.6, 4.3.5.
CVE-2020-11077 at a Glance
Security Impact
CVSS: 6.8
The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N).
How to Fix CVE-2020-11077
To remediate this vulnerability, upgrade all affected Puma dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.
Upgrade puma to 3.12.6Upgrade puma to 4.3.5Run the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for pumaHow to Check if You Are Affected
To determine whether your application is affected by CVE-2020-11077, inspect your project dependencies for Puma:
inspect dependencies for pumaAnalyze the terminal output to locate any version of Puma in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 3.12.6), your application is affected.
Note: Verify declared build manifests and deployed runtime container environments.
Technical Details
Vulnerability Mechanism & Technical Analysis
This vulnerability is classified under CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'), where the product acts as an intermediary http agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed http requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination. In Puma, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.
Source Advisory Statement
CVE-2020-11077 Affected Puma Versions
2 component(s)References
Frequently Asked Questions
What is CVE-2020-11077?
Which Puma versions are affected?
What version fixes CVE-2020-11077?
Is puma affected?
What is the CVSS score of CVE-2020-11077?
What CWE is associated with CVE-2020-11077?
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Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-w64w-qqph-5gxm",
"modified" : "2023-05-16T15:55:12Z",
"published" : "2020-05-22T14:55:09Z",
"aliases" : [ "CVE-2020-11077" ],
"summary" : "HTTP Smuggling via Transfer-Encoding Header in Puma",
"details" : "### Impact\nThis is a similar but different vulnerability to the one patched in 3.12.5 and 4.3.4.\n\nA client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. \n\nIf 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.\n\n### Patches\n\nThe problem has been fixed in Puma 3.12.6 and Puma 4.3.5.\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n* Open an issue in [Puma](https://github.com/puma/puma)\n* See our [security policy](https://github.com/puma/puma/security/policy)",
"severity" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "RubyGems",
"name" : "puma"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0"
}, {
"fixed" : "3.12.6"
} ]
} ]
}, {
"package" : {
"ecosystem" : "RubyGems",
"name" : "puma"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "4.0.0"
}, {
"fixed" : "4.3.5"
} ]
} ]
} ],
"references" : [ {
"type" : "WEB",
"url" : "https://github.com/puma/puma/security/advisories/GHSA-w64w-qqph-5gxm"
}, {
"type" : "ADVISORY",
"url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-11077"
}, {
"type" : "PACKAGE",
"url" : "https://github.com/puma/puma"
}, {
"type" : "WEB",
"url" : "https://github.com/puma/puma/blob/master/History.md#434435-and-31253126--2020-05-22"
}, {
"type" : "WEB",
"url" : "https://github.com/rubysec/ruby-advisory-db/blob/master/gems/puma/CVE-2020-11077.yml"
}, {
"type" : "WEB",
"url" : "https://lists.debian.org/debian-lts-announce/2020/10/msg00009.html"
}, {
"type" : "WEB",
"url" : "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/SKIY5H67GJIGJL6SMFWFLUQQQR3EMVPR"
}, {
"type" : "WEB",
"url" : "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00034.html"
}, {
"type" : "WEB",
"url" : "http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00038.html"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-444" ],
"severity" : "MODERATE",
"github_reviewed" : true,
"github_reviewed_at" : "2020-05-22T14:46:33Z",
"nvd_published_at" : "2020-05-22T15:15:00Z"
}
}