Debian Security Advisory

DLA-3449-1 openssl -- LTS security update

Date Reported:
08 Jun 2023
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 1034720.
In Mitre's CVE dictionary: CVE-2023-0464, CVE-2023-0465, CVE-2023-0466, CVE-2023-2650.
More information:

Multiple vulnerabilities have been discovered in OpenSSL, a Secure Sockets Layer toolkit.

  • CVE-2023-0464

    David Benjamin reported a flaw related to the verification of X.509 certificate chains that include policy constraints, which may result in denial of service.

  • CVE-2023-0465

    David Benjamin reported that invalid certificate policies in leaf certificates are silently ignored. A malicious CA could take advantage of this flaw to deliberately assert invalid certificate policies in order to circumvent policy checking on the certificate altogether.

  • CVE-2023-0466

    David Benjamin discovered that the implementation of the X509_VERIFY_PARAM_add0_policy() function does not enable the check which allows certificates with invalid or incorrect policies to pass the certificate verification (contrary to its documentation).

  • CVE-2023-2650

    It was discovered that processing malformed ASN.1 object identifiers or data may result in denial of service.

For Debian 10 buster, these problems have been fixed in version 1.1.1n-0+deb10u5.

We recommend that you upgrade your openssl packages.

For the detailed security status of openssl please refer to its security tracker page at:

Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: