Puma Gem up to 3.12.3/4.3.2 on Ruby response splitting

CVSS Meta Temp Score
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CTI Interest Score
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5.6$0-$5k0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Puma Gem up to 3.12.3/4.3.2 on Ruby. The affected element is an unknown function. The manipulation results in response splitting. This vulnerability is identified as CVE-2020-5249. The attack can be executed remotely. There is not any exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Puma Gem up to 3.12.3/4.3.2 on Ruby (Ruby Gem). Affected is an unknown functionality. The manipulation with an unknown input leads to a response splitting vulnerability. CWE is classifying the issue as CWE-113. The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers. This is going to have an impact on integrity. CVE summarizes:

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.

The weakness was released 03/02/2020 (GitHub Repository). The advisory is shared for download at github.com. This vulnerability is traded as CVE-2020-5249 since 01/02/2020. It is possible to launch the attack remotely. The successful exploitation needs a authentication. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available.

Upgrading to version 3.12.4 or 4.3.3 eliminates this vulnerability.

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Productinfo

Type

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.6

VulDB Base Score: 4.1
VulDB Temp Score: 3.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector (GitHub, Inc.): 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Response splitting
CWE: CWE-113 / CWE-93 / CWE-74
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Puma Gem 3.12.4/4.3.3
Patch: github.com

Timelineinfo

01/02/2020 🔍
03/02/2020 +60 days 🔍
03/03/2020 +1 days 🔍
05/12/2025 +1896 days 🔍

Sourcesinfo

Advisory: c22712fc93284a45a93f9ad7023888f3a65524f3
Status: Confirmed

CVE: CVE-2020-5249 (🔍)
GCVE (CVE): GCVE-0-2020-5249
GCVE (VulDB): GCVE-100-150816

Entryinfo

Created: 03/03/2020 10:58
Updated: 05/12/2025 03:47
Changes: 03/03/2020 10:58 (38), 03/03/2020 11:03 (12), 04/09/2024 09:26 (18), 04/09/2024 09:27 (20), 05/12/2025 03:47 (8)
Complete: 🔍
Cache ID: 216::103

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