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

low Nessus Plugin ID 51103

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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.

Solution

Update the affected package.

Plugin Details

Severity: Low

ID: 51103

File Name: freebsd_pkg_4ccbd40d03f711e0bf50001a926c7637.nasl

Version: 1.13

Type: local

Family: FreeBSD Local Security Checks

Published: 12/10/2010

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.7

CVSS v2

Risk Factor: Low

Base Score: 2.1

Temporal Score: 1.6

Vector: CVSS2#AV:N/AC:H/Au:S/C:N/I:P/A:N

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:krb5, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 12/9/2010

Vulnerability Publication Date: 11/30/2010

Reference Information

CVE: CVE-2010-4021

BID: 45122

Detections

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