Kerberos pre-authentication bypass via unrecognized PA-DATA

Summary

It is possible to bypass the Kerberos pre-authentication check in Apache Kerby by sending a PA-DATA with an unrecognized or unsupported type. Users are recommended to upgrade to version 2.1.2, which fixes this issue. A flaw was found in Apache Kerby. An attacker can bypass the Kerberos pre-authentication check by sending a Pre-Authentication Data (PA-DATA) packet with an unrecognized or unsupported type. This vulnerability allows an attacker to circumvent the initial authentication step, potentially leading to unauthorized access or impersonation within a Kerberos-protected environment. This is an Important flaw in Apache Kerby, affecting Red Hat products that utilize Kerberos for authentication, including Red Hat AMQ, JBoss Data Grid, Enterprise Application Platform, and Red Hat JBoss Fuse. The vulnerability allows an attacker to bypass the Kerberos pre-authentication check by sending a specially crafted Pre-Authentication Data (PA-DATA) packet. This circumvents an initial authentication step, potentially leading to unauthorized access or impersonation within a Kerberos-protected environment. Red Hat severity: Important — CVSS 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L). Weakness: CWE-358. No fixing RHSA erratum has published yet; monitor the Red Hat CVE page and patch when it ships.