Improper Certificate Validation Affecting openssl package, versions <1.1.1n-0+deb11u5



    Attack Complexity Low

    Threat Intelligence

    EPSS 0.13% (48th percentile)
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5.3 medium
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2 low
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Red Hat
5.3 medium

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  • Snyk ID SNYK-DEBIAN11-OPENSSL-5291777
  • published 29 Mar 2023
  • disclosed 28 Mar 2023

How to fix?

Upgrade Debian:11 openssl to version 1.1.1n-0+deb11u5 or higher.

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:11 relevant fixed versions and status.

The function X509_VERIFY_PARAM_add0_policy() is documented to implicitly enable the certificate policy check when doing certificate verification. However the implementation of the function does not enable the check which allows certificates with invalid or incorrect policies to pass the certificate verification.

As suddenly enabling the policy check could break existing deployments it was decided to keep the existing behavior of the X509_VERIFY_PARAM_add0_policy() function.

Instead the applications that require OpenSSL to perform certificate policy check need to use X509_VERIFY_PARAM_set1_policies() or explicitly enable the policy check by calling X509_VERIFY_PARAM_set_flags() with the X509_V_FLAG_POLICY_CHECK flag argument.

Certificate policy checks are disabled by default in OpenSSL and are not commonly used by applications.