CVE-2021-34433 Auth bypass in Eclipse Californium
Attackers can bypass DTLS server authentication by omitting the ServerKeyExchange signature, allowing man-in-the-middle attacks against Eclipse Californium users.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2021-34433?
CVE-2021-34433 is a high-severity authentication bypass vulnerability in The Eclipse Foundation Eclipse Californium, published on 20 Aug 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In Eclipse Californium version 2.0.0 to 2.6.4 and 3.0.0-M1 to 3.0.0-M3, the certificate based (x509 and RPK) DTLS handshakes accidentally succeeds without verifying the server side's signature on the client side, if that signature is not included in the server's ServerKeyExchange.
Which versions are affected by CVE-2021-34433?
It affects 1 product.
Products include Eclipse Californium.
How do I fix CVE-2021-34433?
No fix has been published for CVE-2021-34433 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2021-34433 being exploited?
There is no known exploitation of CVE-2021-34433 in the wild and no public exploit code.
Other vulnerabilities in The Eclipse Foundation Eclipse Californium
- CVE-2022-39368 Californium Failing DTLS handshakes causes Data Loss due to throttling blocking processing of records
- CVE-2022-2576 Eclipse Californium denial of service (DoS) via Datagram Transport Layer Security (DTLS) handshake on parameter mismatch
- CVE-2020-27222 Denial of service in Eclipse Californium
Sources
Also known as GHSA-48jg-h3cv-mqvx.