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FreeBSD : FreeBSD -- Missing message validation in libradius(3) (107c7a76-beaa-11eb-b87a-901b0ef719ab)

high Nessus Plugin ID 150010

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Synopsis

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

Description

libradius did not perform sufficient validation of received messages.

rad_get_attr(3) did not verify that the attribute length is valid before subtracting the length of the Type and Length fields. As a result, it could return success while also providing a bogus length of SIZE_T_MAX - 2 for the Value field.

When processing attributes to find an optional authenticator, is_valid_response() failed to verify that each attribute length is non-zero and could thus enter an infinite loop. Impact : A server may use libradius(3) to process messages from RADIUS clients. In this case, a malicious client could trigger a denial-of-service in the server. A client using libradius(3) to process messages from a server is susceptible to the same problem.

The impact of the rad_get_attr(3) bug depends on how the returned length is validated and used by the consumer. It is possible that libradius(3) applications will crash or enter an infinite loop when calling rad_get_attr(3) on untrusted RADIUS messages.

Solution

Update the affected packages.

See Also

http://www.nessus.org/u?974263d0

Plugin Details

Severity: High

ID: 150010

File Name: freebsd_pkg_107c7a76beaa11ebb87a901b0ef719ab.nasl

Version: 1.3

Type: local

Published: 5/27/2021

Updated: 6/14/2021

Configuration: Enable paranoid mode

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2021-29629

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

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

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

Exploit Ease: No known exploits are available

Patch Publication Date: 5/27/2021

Vulnerability Publication Date: 5/27/2021

Reference Information

CVE: CVE-2021-29629

FreeBSD: SA-21:12.libradius