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CVE-2020-5247

CVE information

Published

2 years ago

Last Modified

2 months ago

CVSSv2.0 Severity

Medium

CVSSv3.1 Severity

High

Impact Analysis

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..

CVSSv2.0 Score

Severity
Medium
Base Score
5/10
Exploit Score
10/10
Access Vector
Network
Access Complexity
Low
Authentication Required
None
Impact Score
2.9/10
Confidentiality Impact
None
Availability Impact
None
Integrity Impact
Partial

CVSSv3.1 Score

Severity
High
Base Score
7.5/10
Exploit Score
3.9/10
Access Vector
Network
Access Complexity
Low
Privileges Required
None
Impact Score
3.6/10
Confidentiality Impact
None
Availability Impact
None
Integrity Impact
High
Scope
Unchanged
User Interaction
None

Products Affected

CPE Affected Vulnerable Excluding Edit
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
  Yes
2.6.0 -
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
  Yes
2.5.0 -
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
  Yes
2.4.0 -
cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
  Yes
- -
cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*
  Yes
4.0.0 -
cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*
  Yes
- -
cpe:2.3:a:ruby-lang:ruby:2.7.0:preview1:*:*:*:*:*:*
  Yes
- -