FreeBSD : go -- math/big: panic during recursive division of very large numbers; cmd/go: arbitrary code execution at build time through cgo (db4b2f27-252a-11eb-865c-00155d646400)

high Nessus Plugin ID 142883

Language:

New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote FreeBSD host is missing a security-related update.

Description

The Go project reports :

A number of math/big.Int methods (Div, Exp, DivMod, Quo, Rem, QuoRem, Mod, ModInverse, ModSqrt, Jacobi, and GCD) can panic when provided crafted large inputs. For the panic to happen, the divisor or modulo argument must be larger than 3168 bits (on 32-bit architectures) or 6336 bits (on 64-bit architectures). Multiple math/big.Rat methods are similarly affected.

The go command may execute arbitrary code at build time when cgo is in use. This may occur when running go get on a malicious package, or any other command that builds untrusted code. This can be caused by a malicious gcc flags specified via a #cgo directive.

The go command may execute arbitrary code at build time when cgo is in use. This may occur when running go get on a malicious package, or any other command that builds untrusted code. This can be caused by malicious unquoted symbol names.

Solution

Update the affected package.

See Also

https://github.com/golang/go/issues/42552

https://github.com/golang/go/issues/42556

https://github.com/golang/go/issues/42559

http://www.nessus.org/u?af664f16

Plugin Details

Severity: High

ID: 142883

File Name: freebsd_pkg_db4b2f27252a11eb865c00155d646400.nasl

Version: 1.8

Type: local

Published: 11/13/2020

Updated: 7/6/2021

Dependencies: ssh_get_info.nasl

Risk Information

CVSS Score Source: CVE-2020-28367

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 5.1

Temporal Score: 3.8

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

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:go, 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: 11/12/2020

Vulnerability Publication Date: 11/9/2020

Reference Information

CVE: CVE-2020-28362, CVE-2020-28366, CVE-2020-28367

IAVB: 2020-B-0071-S