FreeBSD : krb5 -- Integer overflow vulnerabilities in PAC parsing (094e4a5b-6511-11ed-8c5e-206a8a720317)

high Nessus Plugin ID 167549

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Synopsis

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

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 094e4a5b-6511-11ed-8c5e-206a8a720317 advisory.

- The Kerberos libraries used by Samba provide a mechanism for authenticating a user or service by means of tickets that can contain Privilege Attribute Certificates (PACs). Both the Heimdal and MIT Kerberos libraries, and so the embedded Heimdal shipped by Samba suffer from an integer multiplication overflow when calculating how many bytes to allocate for a buffer for the parsed PAC. On a 32-bit system an overflow allows placement of 16-byte chunks of entirely attacker- controlled data. (Because the user's control over this calculation is limited to an unsigned 32-bit value, 64-bit systems are not impacted).
The server most vulnerable is the KDC, as it will parse an attacker-controlled PAC in the S4U2Proxy handler. The secondary risk is to Kerberos-enabled file server installations in a non-AD realm. A non-AD Heimdal KDC controlling such a realm may pass on an attacker-controlled PAC within the service ticket.
(CVE-2022-42898)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

Plugin Details

Severity: High

ID: 167549

File Name: freebsd_pkg_094e4a5b651111ed8c5e206a8a720317.nasl

Version: 1.7

Type: local

Family: FreeBSD Local Security Checks

Published: 11/15/2022

Updated: 11/6/2023

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 9

Temporal Score: 7

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

CVSS Score Source: CVE-2022-42898

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:krb5, p-cpe:/a:freebsd:freebsd:krb5-119, p-cpe:/a:freebsd:freebsd:krb5-120, p-cpe:/a:freebsd:freebsd:krb5-devel, cpe:/o:freebsd:freebsd

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 11/15/2022

Vulnerability Publication Date: 11/15/2022

Reference Information

CVE: CVE-2022-42898

IAVB: 2022-B-0052-S

Detections

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