Inconsistent interpretation of HTTP requests in Puma - CVE-2021-41136
Published: May 25, 2022 / Updated: May 25, 2022
Vulnerability identifier: #VU63634
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-41136
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Evan Phoenix
Affected software:
Puma
Puma
Detailed vulnerability description
The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.
The vulnerability exists due to improper validation of HTTP requests. A remote attacker can send a specially crafted HTTP header values which contain the LF character to the server and smuggle arbitrary HTTP headers.
Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.
How to mitigate CVE-2021-41136
Install updates from vendor's website.