National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2020-5247 Detail

Current Description

In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters.

Source:  MITRE
View Analysis Description

Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score: 7.5 HIGH
Vector:  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

Nist CVSS score does not match with CNA score
CNA:  GitHub, Inc.
Base Score: 6.5 MEDIUM
Vector:  CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8v Mitigation Third Party Advisory
https://owasp.org/www-community/attacks/HTTP_Response_Splitting Third Party Advisory
https://www.ruby-lang.org/en/news/2019/10/01/http-response-splitting-in-webrick-cve-2019-16254 Vendor Advisory

Weakness Enumeration

CWE-ID CWE Name Source
CWE-74 Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection') NIST  
CWE-113 Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Response Splitting') GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*
     Show Matching CPE(s)
Up to (including)
3.12.3
 cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*
     Show Matching CPE(s)
From (including)
4.0.0
Up to (including)
4.3.2
 cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
Up to (including)
2.3.0
 cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
2.4.0
Up to (including)
2.4.7
 cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
2.5.0
Up to (including)
2.5.6
 cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
     Show Matching CPE(s)
From (including)
2.6.0
Up to (including)
2.6.4
 cpe:2.3:a:ruby-lang:ruby:2.7.0:preview1:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

2 change records found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2020-5247
NVD Published Date:
02/28/2020
NVD Last Modified:
03/04/2020