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CVE-2023-6237 Affecting openssl package, versions *

low

Snyk CVSS

      Threat Intelligence

      EPSS 0.05% (15th percentile)
    Expand this section
    Red Hat
    5.9 medium
    Expand this section
    SUSE
    5.9 medium

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    • Snyk ID SNYK-DEBIAN12-OPENSSL-6157243
    • published 16 Jan 2024
    • disclosed 25 Apr 2024
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    Introduced: 16 Jan 2024

    CVE-2023-6237 Open this link in a new tab

    How to fix?

    There is no fixed version for Debian:12 openssl.

    NVD Description

    Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by Debian. See How to fix? for Debian:12 relevant fixed versions and status.

    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.