|plugins/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.
|CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Vulnerable and fixed packages
The table below lists information on source packages.
The information below is based on the following data on fixed versions.
Fixed by: https://github.com/krb5/krb5/commit/fbb687db1088ddd894d975996e5f6a4252b9a2b4
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.