FreeBSD : krb5 -- client impersonation vulnerability (4ccbd40d-03f7-11e0-bf50-001a926c7637)

This script is Copyright (C) 2010-2013 Tenable Network Security, Inc.


Synopsis :

The remote FreeBSD host is missing a security-related update.

Description :

The MIT Kerberos team reports :

MIT krb5 KDC may issue tickets not requested by a client, based on an
attacker-chosen KrbFastArmoredReq.

An authenticated remote attacker that controls a legitimate service
principal could obtain a valid service ticket to itself containing
valid KDC-generated authorization data for a client whose TGS-REQ it
has intercepted. The attacker could then use this ticket for S4U2Proxy
to impersonate the targeted client even if the client never
authenticated to the subverted service. The vulnerable configuration
is believed to be rare.

See also :

http://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt
http://www.nessus.org/u?4c4750ed

Solution :

Update the affected package.

Risk factor :

Low / CVSS Base Score : 2.1
(CVSS2#AV:N/AC:H/Au:S/C:N/I:P/A:N)
CVSS Temporal Score : 1.6
(CVSS2#E:POC/RL:OF/RC:C)
Public Exploit Available : true

Family: FreeBSD Local Security Checks

Nessus Plugin ID: 51103 ()

Bugtraq ID: 45122

CVE ID: CVE-2010-4021

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