CVE Vulnerabilities


Published: Apr 25, 2024 | Modified: Jun 10, 2024
CVSS 3.x
CVSS 2.x
5.9 LOW

Issue summary: Checking excessively long invalid RSA public keys may take a long time.

Impact summary: Applications that use the function EVP_PKEY_public_check() to check RSA public keys may experience long delays. Where the key that is being checked has been obtained from an untrusted source this may lead to a Denial of Service.

When function EVP_PKEY_public_check() is called on RSA public keys, a computation is done to confirm that the RSA modulus, n, is composite. For valid RSA keys, n is a product of two or more large primes and this computation completes quickly. However, if n is an overly large prime, then this computation would take a long time.

An application that calls EVP_PKEY_public_check() and supplies an RSA key obtained from an untrusted source could be vulnerable to a Denial of Service attack.

The function EVP_PKEY_public_check() is not called from other OpenSSL functions however it is called from the OpenSSL pkey command line application. For that reason that application is also vulnerable if used with the -pubin and -check options on untrusted data.

The OpenSSL SSL/TLS implementation is not affected by this issue.

The OpenSSL 3.0 and 3.1 FIPS providers are affected by this issue.

Affected Software

Name Vendor Start Version End Version
Red Hat Enterprise Linux 9 RedHat openssl-1:3.0.7-27.el9 *
Red Hat Enterprise Linux 9 RedHat openssl-1:3.0.7-27.el9 *
Edk2 Ubuntu bionic *
Edk2 Ubuntu devel *
Edk2 Ubuntu noble *
Edk2 Ubuntu trusty *
Edk2 Ubuntu xenial *
Nodejs Ubuntu jammy *
Nodejs Ubuntu trusty *
Openssl Ubuntu bionic *
Openssl Ubuntu devel *
Openssl Ubuntu jammy *
Openssl Ubuntu lunar *
Openssl Ubuntu mantic *
Openssl Ubuntu noble *
Openssl Ubuntu trusty *
Openssl Ubuntu upstream *
Openssl Ubuntu xenial *
Openssl1.0 Ubuntu bionic *