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The validate_as_request function in kdc_util.c in the Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service (NULL pointer dereference and daemon crash) via an S4U2Self request.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade krb5 | Aug 30, 2017 | Aug 1, 2016 |
| Amazon_linux | — | Upgrade krb5 | Feb 7, 2017 | Jul 31, 2016 |
| Debian | — | Upgrade krb5 | Feb 20, 2019 | Jul 31, 2016 |
| Freebsd | — | Upgrade krb5-114Upgrade krb5-113 | Dec 10, 2025 | Jul 21, 2016 |
| Huawei Euleros 2_0_sp1 | — | Upgrade krb5-libsUpgrade krb5-develUpgrade krb5-pkinitUpgrade krb5-serverUpgrade krb5-workstationUpgrade krb5-server-ldap | Nov 30, 2017 | Jul 31, 2016 |
| Oracle Solaris | — | Upgrade security/kerberos-5 to version 1.14.4.0-0.175.3.21.0.2.0 on Solaris 11.3Upgrade security/kerberos-5/kdc to version 1.14.4.0-0.175.3.21.0.2.0 on Solaris 11.3 | Jun 20, 2017 | Jul 31, 2016 |
| Oracle_linux | — | Upgrade krb5-workstationUpgrade krb5-develUpgrade krb5-pkinitUpgrade krb5-libsUpgrade libkadm5Upgrade krb5-server-ldapUpgrade krb5-server | Nov 9, 2016 | Jul 19, 2016 |
| Redhat_linux | — | Upgrade krb5-workstationUpgrade krb5-pkinitUpgrade krb5-serverUpgrade krb5-develNo solution existsUpgrade libkadm5Upgrade krb5-libsUpgrade krb5-server-ldapUpgrade krb5-debuginfo | Nov 4, 2016 | Jul 31, 2016 |
| Suse | — | Upgrade krb5-clientUpgrade krb5-plugin-preauth-otpUpgrade krb5-develUpgrade krb5-plugin-kdb-ldapUpgrade krb5-serverUpgrade krb5-32bitUpgrade krb5-docUpgrade krb5-plugin-preauth-pkinitUpgrade krb5 | Aug 26, 2016 | Jul 31, 2016 |
| Ubuntu | — | Upgrade krb5 | Nov 19, 2024 | Aug 1, 2016 |
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