HTTP request smuggling in Undertow



Published: 2021-03-17
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-20220
CWE-ID CWE-444
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe
Undertow
Server applications / Web servers

Vendor Red Hat Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Inconsistent interpretation of HTTP requests

EUVDB-ID: #VU51518

Risk: Medium

CVSSv3.1:

CVE-ID: CVE-2021-20220

CWE-ID: CWE-444 - Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

Exploit availability: No

Description

The vulnerability allows a remote attacker to preform HTTP request smuggling attacks.

The vulnerability exists due to improper validation of HTTP requests when processing HTTP/1.x and HTTP/2  protocols. A remote attacker can send a specially crafted HTTP request to the server and smuggle arbitrary HTTP headers.

Successful exploitation of vulnerability may allow an attacker to poison HTTP cache and perform phishing attacks.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Undertow: 2.0.0 - 2.1.5


CPE2.3 External links

http://bugzilla.redhat.com/show_bug.cgi?id=1923133

Q & A

Can this vulnerability be exploited remotely?

How the attacker can exploit this vulnerability?

Is there known malware, which exploits this vulnerability?



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