#VU88155 Input validation error in Undertow - CVE-2023-4639

Vulnerability identifier: #VU88155

Vulnerability risk: Medium

CVSSv4.0: 1.2 [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-2023-4639

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Undertow
Server applications / Web servers

Vendor: Red Hat Inc.

Description

The vulnerability allows a remote attacker to bypass implemented security restrictions.

The vulnerability exists due to insufficient validation of cookies with certain value-delimiting characters in incoming requests. A remote attacker can construct a cookie value to exfiltrate HttpOnly cookie values or spoof arbitrary additional cookie values, leading to unauthorized data access or modification.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Undertow: 2.0.0.Alpha1 - 2.3.11

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External links
https://bugzilla.redhat.com/show_bug.cgi?id=2166022

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.