Vulnerabilities have been discovered in Kerberos V5, which can be exploited by malicious users to compromise a vulnerable system.
The vulnerabilities are caused due to boundary errors within the "krb5_aname_to_localname()" library function during conversion of Kerberos principal names into local account names. These can be exploited to cause heap-based buffer overflows by passing an overly long principal name when authenticating.
Exploitation may allow execution of arbitrary code on a vulnerable system with root privileges. However, this requires successful authentication to a vulnerable service, and the explicit mapping or rules-based mapping functionality has been enabled (not default configuration).
The vulnerabilities affect version 1.3.3 and prior.
Solution: Disable the affected functionality or apply patch:
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