Some vulnerabilities have been reported in Kerberos, which can be exploited by malicious users and malicious people to compromise a vulnerable system.
1) A boundary error within the implementation of the RPCSEC_GSS authentication type exists in the "svcauth_gss_validate()" function in src/lib/rpc/svc_auth_gss.c. This can be exploited to cause a stack-based buffer overflow by sending a specially crafted RPC message to a vulnerable server.
Successful exploitation potentially allows the execution of arbitrary code. Products linking to the RPC library may also be affected.
2) The "kadm5_modify_policy_internal()" function in src/lib/kadm5/srv/svr_policy.c does not correctly check return values of the "krb5_db_get_policy()" function. This can be exploited to cause a memory corruption and may potentially allow the execution of arbitrary code.
Successful exploitation requires valid user credentials and privileges to modify policies.
Vulnerability #1 is reported in krb5-1.4 through krb5-1.6.2, vulnerability #2 is reported in krb5-1.5 through krb5-1.6.2.
Solution: Update to Kerberos 1.5.5 or 1.6.3 as soon as available or apply patches.
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Subject: Kerberos Multiple Vulnerabilities
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