CVE-2023-32690 Responder can Invoke Undefined Behavior in libspdm Requester
An attacker can cause undefined behavior and potential denial of service in libspdm Requesters by providing an unvalidated CTExponent value.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- None listed
What is CVE-2023-32690?
CVE-2023-32690 is a medium-severity vulnerability in DMTF libspdm, published on 1 Jun 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
libspdm is a sample implementation that follows the DMTF SPDM specifications. Prior to versions 2.3.3 and 3.0, following a successful CAPABILITIES response, a libspdm Requester stores the Responder's CTExponent into its context without validation. If the Requester sends a request message that requires a cryptography operation by the Responder, such as CHALLENGE, libspdm will calculate the timeout value using the Responder's unvalidated CTExponent.
A patch is available in version 2.3.3. A workaround is also available. After completion of VCA, the Requester can check the value of the Responder's CTExponent. If it greater than or equal to 64, then the Requester can stop communication with the Responder.
Weakness: CWE-20
Which versions are affected by CVE-2023-32690?
It affects 1 product.
Products include Dmtf Libspdm.
How do I fix CVE-2023-32690?
No fix has been published for CVE-2023-32690 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-32690 being exploited?
There is no known exploitation of CVE-2023-32690 in the wild and no public exploit code.
Other vulnerabilities in DMTF libspdm
Sources
Also known as GHSA-56h8-4gv5-jf2c.