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FreeBSD : krb5 -- requires_preauth bypass in PKINIT-enabled KDC (406636fe-055d-11e5-aab1-d050996490d0)

medium Nessus Plugin ID 83901

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Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

MIT reports :

In MIT krb5 1.12 and later, when the KDC is configured with PKINIT support, an unauthenticated remote attacker can bypass the requires_preauth flag on a client principal and obtain a ciphertext encrypted in the principal's long-term key. This ciphertext could be used to conduct an off-line dictionary attack against the user's password.

Solution

Update the affected packages.

See Also

http://krbdev.mit.edu/rt/Ticket/Display.html?id=8160

http://www.nessus.org/u?52da1a12

Plugin Details

Severity: Medium

ID: 83901

File Name: freebsd_pkg_406636fe055d11e5aab1d050996490d0.nasl

Version: 2.6

Type: local

Published: 5/29/2015

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5.8

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:krb5, p-cpe:/a:freebsd:freebsd:krb5-112, cpe:/o:freebsd:freebsd

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

Patch Publication Date: 5/28/2015

Vulnerability Publication Date: 5/25/2015

Reference Information

CVE: CVE-2015-2694