FreeBSD : krb5 -- client impersonation vulnerability (4ccbd40d-03f7-11e0-bf50-001a926c7637)
Low Nessus Plugin ID 51103
SynopsisThe remote FreeBSD host is missing a security-related update.
DescriptionThe 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.
SolutionUpdate the affected package.