Kerberos 5 Database Dump Variable Type Mismatch Vulnerability

CVE-2018-5709 · MEDIUM Severity

AV:N/AC:L/AU:N/C:N/I:P/A:N

An issue was discovered in MIT Kerberos 5 (aka krb5) through 1.16. There is a variable "dbentry->n_key_data" in kadmin/dbutil/dump.c that can store 16-bit data but unknowingly the developer has assigned a "u4" variable to it, which is for 32-bit data. An attacker can use this vulnerability to affect other artifacts of the database as we know that a Kerberos database dump file contains trusted data.

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