PT-2018-2699 · Gnu+5 · Bash+5

Sylvain Beucler · Published 2018-11-14 · Updated 2022-04-05 · CVE-2019-9924

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Bash versions prior to 4.4-beta2

Description The issue is related to the restricted command interpreter rbash in Bash, which is associated with insufficient checking of the BASH CMDS array values. This could allow an attacker to execute arbitrary commands. The problem arises because rbash does not prevent the shell user from modifying BASH CMDS, thus enabling the user to execute any command with the permissions of the shell.

Recommendations For versions prior to 4.4-beta2, update to version 4.4-beta2 or later to resolve the issue. As a temporary workaround, consider restricting access to the BASH CMDS array to minimize the risk of exploitation.

Fix

Missing Authorization

RCE

Weakness Enumeration

CWE-862

CWE-20

Related Identifiers

ALT-PU-2018-2880

BDU:2019-01405

CESA-2020_1113

CVE-2019-9924

DLA-1726-1

MGASA-2019-0163

OPENSUSE-SU-2019_1178-1

RHSA-2020:1113

RHSA-2020:3474

RHSA-2020:3592

RHSA-2020:3803

RHSA-2020_1113

SUSE-SU-2019:0838-1

SUSE-SU-2019:0838-2

SUSE-SU-2019:0898-1

SUSE-SU-2019_0838-1

SUSE-SU-2019_0838-2

SUSE-SU-2019_0898-1

USN-4058-1

USN-4058-2

Affected Products

Alt Linux

Bash

Centos

Red Hat

Suse

Ubuntu

References · 35

• https://ubuntu.com/security/notices/USN-4058-2 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:0838-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:0838-2 · Vendor Advisory
• https://usn.ubuntu.com/4058-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2019-9924 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2019-9924 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-4058-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2019-9924 · Security Note
• https://osv.dev/vulnerability/USN-4058-2 · Vendor Advisory
• https://ubuntu.com/security/CVE-2019-9924 · Vendor Advisory
• https://bdu.fstec.ru/vul/2019-01405 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2019-9924 · Security Note
• https://osv.dev/vulnerability/CVE-2019-9924 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2019-0163 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2019:0898-1 · Vendor Advisory