Descriptionplugins/preauth/pkinit/pkinit_crypto_openssl.c in MIT Kerberos 5 (aka krb5) through 1.15.2 mishandles Distinguished Name (DN) fields, which allows remote attackers to execute arbitrary code or cause a denial of service (buffer overflow and application crash) in situations involving untrusted X.509 data, related to the get_matching_data and X509_NAME_oneline_ex functions. NOTE: this has security relevance only in use cases outside of the MIT Kerberos distribution, e.g., the use of get_matching_data in KDC certauth plugin code that is specific to Red Hat.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs871698

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
krb5 (PTS)bullseye1.18.3-6+deb11u4fixed
bullseye (security)1.18.3-6+deb11u5fixed
bookworm (security)1.20.1-2+deb12u2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs

Fixed by:
Red Hat eanbled the code in question in the KDC and thus having it
exposed as network-facing issue. For Debian and upstream the code only
runs on client systems, and only with a certificate that is explicitly
configured locally, leading to a local kinit crash if passed a crafted
local certificate. This is hardly has any harmful security implication.

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