Overview
- Description
- Puma is a Ruby/Rack web server built for parallelism. In affected versions clients could clobber values set by intermediate proxies (such as X-Forwarded-For) by providing a underscore version of the same header (X-Forwarded_For). Any users relying on proxy set variables is affected. v6.4.3/v5.6.9 now discards any headers using underscores if the non-underscore version also exists. Effectively, allowing the proxy defined headers to always win. Users are advised to upgrade. Nginx has a underscores_in_headers configuration variable to discard these headers at the proxy level as a mitigation. Any users that are implicitly trusting the proxy defined headers for security should immediately cease doing so until upgraded to the fixed versions.
- Source
- security-advisories@github.com
- NVD status
- Analyzed
Risk scores
CVSS 3.1
- Type
- Primary
- Base score
- 5.4
- Impact score
- 2.7
- Exploitability score
- 2.2
- Vector string
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
- Severity
- MEDIUM
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
"criteria": "cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*",
"vulnerable": true,
"matchCriteriaId": "97372632-D7E2-4DE6-A0CB-4191EF627AF4",
"versionEndExcluding": "5.6.9"
},
{
"criteria": "cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*",
"vulnerable": true,
"matchCriteriaId": "70AE8ED4-BC0B-4714-9B00-EF4A321DACAC",
"versionEndExcluding": "6.4.3",
"versionStartIncluding": "6.0.0"
}
],
"operator": "OR"
}
]
}
]