HTTP Response Splitting (Early Hints) in Puma
CVE-2020-5249

6.5MEDIUM

Key Information:

Vendor

Puma

Status
Puma
Vendor
CVE Published:
2 March 2020

What is CVE-2020-5249?

In Puma (RubyGem) before 4.3.3 and 3.12.4, if an application using Puma allows untrusted input in an early-hints header, an attacker can use a carriage return character 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-2020-5247, which fixed this vulnerability but only for regular responses. This has been fixed in 4.3.3 and 3.12.4.

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Affected Version(s)

Puma < 3.12.4 < 3.12.4

Puma >= 4.0.0, < 4.3.3 < 4.0.0, 4.3.3

References

https://owasp.org/www-community/attacks/HTTP_Response_Spl...
x_refsource_MISC
https://github.com/puma/puma/security/advisories/GHSA-33v...
x_refsource_CONFIRM
https://github.com/puma/puma/security/advisories/GHSA-84j...
x_refsource_MISC

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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