CVE-2020-5247
EUVD-2020-029528.02.2020, 17:15
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.
Affected Products (NVD)
| Vendor | Product | Version |
|---|---|---|
| puma | puma | 𝑥 ≤ 3.12.3 |
| puma | puma | 4.0.0 ≤ 𝑥 ≤ 4.3.2 |
| ruby-lang | ruby | 𝑥 ≤ 2.3.0 |
| ruby-lang | ruby | 2.4.0 ≤ 𝑥 ≤ 2.4.7 |
| ruby-lang | ruby | 2.5.0 ≤ 𝑥 ≤ 2.5.6 |
| ruby-lang | ruby | 2.6.0 ≤ 𝑥 ≤ 2.6.4 |
| ruby-lang | ruby | 2.7.0:preview1 |
| debian | debian_linux | 9.0 |
𝑥
= Vulnerable software versions
Debian Releases
Common Weakness Enumeration
- CWE-113 - Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')The software 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.
- CWE-74 - Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.
References