MIT Kerberos 5: Multiple vulnerabilities

MIT Kerberos 5: Multiple vulnerabilities Multiple vulnerabilities in MIT Kerberos 5 might allow remote unauthenticated users to execute arbitrary code with root privileges. mit-krb5 2009-04-08 2009-04-08 262736 263398 remote 1.6.3-r6 1.6.3-r6

MIT Kerberos 5 is a suite of applications that implement the Kerberos network protocol. kadmind is the MIT Kerberos 5 administration daemon, KDC is the Key Distribution Center.

Multiple vulnerabilities have been reported in MIT Kerberos 5:

A free() call on an uninitialized pointer in the ASN.1 decoder when decoding an invalid encoding (CVE-2009-0846).
A buffer overread in the SPNEGO GSS-API application, reported by Apple Product Security (CVE-2009-0844).
A NULL pointer dereference in the SPNEGO GSS-API application, reported by Richard Evans (CVE-2009-0845).
An incorrect length check inside an ASN.1 decoder leading to spurious malloc() failures (CVE-2009-0847).

A remote unauthenticated attacker could exploit the first vulnerability to cause a Denial of Service or, in unlikely circumstances, execute arbitrary code on the host running krb5kdc or kadmind with root privileges and compromise the Kerberos key database. Exploitation of the other vulnerabilities might lead to a Denial of Service in kadmind, krb5kdc, or other daemons performing authorization against Kerberos that utilize GSS-API or an information disclosure.

There is no known workaround at this time.

All MIT Kerberos 5 users should upgrade to the latest version:


    # emerge --sync
    # emerge --ask --oneshot --verbose ">=app-crypt/mit-krb5-1.6.3-r6"

CVE-2009-0844 CVE-2009-0845 CVE-2009-0846 CVE-2009-0847 rbu p-y