Vulnerability · Published Jun 1, 2023 · Assigned by GitHub_M

CVE-2023-32690Responder can Invoke Undefined Behavior in libspdm Requester

Medium 5.7

In plain English

A medium-severity improper input validation in libspdm from DMTF. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities).

Severity (CVSS 3.1)5.7Medium

Exploit odds (30 days)0.7%top 46.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
DMTF	libspdm	< 2.3.3

Weakness: CWE-20 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

References

https://github.com/DMTF/libspdm/security/advisories/GHSA-56h8-4gv5-jf2c x_refsource_CONFIRM
https://github.com/DMTF/libspdm/issues/2068 x_refsource_MISC
https://github.com/DMTF/libspdm/pull/2069 x_refsource_MISC