EulerOS Virtualization 3.0.2.2 : bash (EulerOS-SA-2020-2218)

high Nessus Plugin ID 141731

Synopsis

The remote EulerOS Virtualization host is missing a security update.

Description

According to the version of the bash package installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerability :

- An issue was discovered in disable_priv_mode in shell.c in GNU Bash through 5.0 patch 11. By default, if Bash is run with its effective UID not equal to its real UID, it will drop privileges by setting its effective UID to its real UID. However, it does so incorrectly.
On Linux and other systems that support 'saved UID' functionality, the saved UID is not dropped. An attacker with command execution in the shell can use 'enable -f' for runtime loading of a new builtin, which can be a shared object that calls setuid() and therefore regains privileges. However, binaries running with an effective UID of 0 are unaffected.(CVE-2019-18276)

Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Solution

Update the affected bash package.

Plugin Details

Severity: High

ID: 141731

File Name: EulerOS_SA-2020-2218.nasl

Version: 1.6

Type: local

Family: Huawei Local Security Checks

Published: 10/21/2020

Updated: 1/6/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: High

Base Score: 7.2

Temporal Score: 5.6

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

CVSS Score Source: CVE-2019-18276

CVSS v3

Risk Factor: High

Base Score: 7.8

Temporal Score: 7

Vector: CVSS:3.0/AV:L/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:huawei:euleros:bash, cpe:/o:huawei:euleros:uvp:3.0.2.2

Required KB Items: Host/local_checks_enabled, Host/cpu, Host/EulerOS/release, Host/EulerOS/rpm-list, Host/EulerOS/uvp_version

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 10/21/2020

Reference Information

CVE: CVE-2019-18276

Detections

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