CVE-2023-4639 Undertow: cookie smuggling/spoofing
Attackers can exfiltrate HttpOnly cookies or spoof cookie values via malformed requests, leading to unauthorized data access or modification.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2023-4639?
CVE-2023-4639 is a high-severity vulnerability in Red Hat Migration Toolkit for Applications 6, published on 17 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in Undertow, which incorrectly parses cookies with certain value-delimiting characters in incoming requests. This issue could allow an attacker to construct a cookie value to exfiltrate HttpOnly cookie values or spoof arbitrary additional cookie values, leading to unauthorized data access or modification. The main threat from this flaw impacts data confidentiality and integrity.
Weakness: CWE-444
Which versions are affected by CVE-2023-4639?
4 open source packages ship an affected version, including io.undertow:undertow-core.
| Package | Affected | Fixed in |
|---|---|---|
io.undertow:undertow-core Maven | All versions | 2.2.30.Final |
io.undertow:undertow-core Maven | All versions | 2.2.30.Final |
io.undertow:undertow-core Maven | From 2.3.0.Alpha1 | 2.3.11.Final |
io.undertow:undertow-core Maven | From 2.3.0.Alpha1 | 2.3.11.Final |
How do I fix CVE-2023-4639?
Upgrade io.undertow:undertow-core to a fixed version for your release line: 2.2.30.Final or 2.3.11.Final.
Is CVE-2023-4639 being exploited?
There is no known exploitation of CVE-2023-4639 in the wild and no public exploit code.
Sources
Also known as CLSA-2026-1789372923, CLSA-2026-1789457514, DEBIAN-CVE-2023-4639, GHSA-3jrv-jgp8-45v3, UBUNTU-CVE-2023-4639.