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.
Published 2020-03-02 16:15:12
Updated 2020-04-09 17:15:13
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: Cross site scripting (XSS)

Exploit prediction scoring system (EPSS) score for CVE-2020-5249

Probability of exploitation activity in the next 30 days: 0.15%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 52 % EPSS Score History EPSS FAQ

CVSS scores for CVE-2020-5249

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source
4.0
MEDIUM AV:N/AC:L/Au:S/C:N/I:P/A:N
8.0
2.9
NIST
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
2.8
3.6
NIST
6.5
MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
2.3
3.7
GitHub, Inc.

CWE ids for CVE-2020-5249

References for CVE-2020-5249

Products affected by CVE-2020-5249

  • Puma » Puma » For Ruby
    Versions up to, including, (<=) 3.12.3
    cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*
  • Puma » Puma » For Ruby
    Versions from including (>=) 4.0.0 and up to, including, (<=) 4.3.2
    cpe:2.3:a:puma:puma:*:*:*:*:*:ruby:*:*
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