Multiple vulnerabilities have been discovered in OpenSSL, a Secure
Sockets Layer toolkit.
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.
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
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).
It was discovered that processing malformed ASN.1 object identifiers
or data may result in denial of service.
For the stable distribution (bullseye), these problems have been fixed in version 1.1.1n-0+deb11u5.
We recommend that you upgrade your openssl packages.