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CVE-2020-5247— HTTP Response Splitting in Puma

Quick assessment

Affected
puma Puma
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Puma是一款针对高并发应用的Web服务器。 Puma (RubyGem) 4.3.2之前版本和3.12.2之前版本中存在注入漏洞。攻击者可通过使用换行符（例如CR，LF，/ r或 / n）利用该漏洞结束标头并注入恶意内容。

CVSS 6.5 · Medium EPSS 2.55% · P84
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I. Basic Information for CVE-2020-5247

Vulnerability Information
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Vulnerability Title
HTTP Response Splitting in Puma
Source: CVE Program / CVE List V5
Vulnerability 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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
Puma 注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Puma是一款针对高并发应用的Web服务器。 Puma (RubyGem) 4.3.2之前版本和3.12.2之前版本中存在注入漏洞。攻击者可通过使用换行符（例如CR，LF，/ r或 / n）利用该漏洞结束标头并注入恶意内容。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
puma Puma < 3.12.3 -

II. Public POCs for CVE-2020-5247

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III. Intelligence Information for CVE-2020-5247

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Vendor Advisories for CVE-2020-5247 (1)

Mailing List Discussions for CVE-2020-5247 (3)

Other References for CVE-2020-5247 (1)

IV. Related Vulnerabilities

Same product: Puma
Same vendor: puma
Same weakness: CWE-113

V. Comments for CVE-2020-5247

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