Detections
Analytics
Siemens (CVE-2021-4034)
high Tenable OT Security Plugin ID 501030
Synopsis
The remote OT asset is affected by a vulnerability.Description
A local privilege escalation vulnerability was found on polkit's pkexec utility. The pkexec application is a setuid tool designed to allow unprivileged users to run commands as privileged users according predefined policies. The current version of pkexec doesn't handle the calling parameters count correctly and ends trying to execute environment variables as commands. An attacker can leverage this by crafting environment variables in such a way it'll induce pkexec to execute arbitrary code. When successfully executed the attack can cause a local privilege escalation given unprivileged users administrative rights on the target machine.This plugin only works with Tenable.ot.
Please visit https://www.tenable.com/products/tenable-ot for more information.
Solution
Refer to the vendor advisory.See Also
https://www.qualys.com/2022/01/25/cve-2021-4034/pwnkit.txt
https://access.redhat.com/security/vulnerabilities/RHSB-2022-001
https://bugzilla.redhat.com/show_bug.cgi?id=2025869
http://www.nessus.org/u?40c4feca
http://www.nessus.org/u?58b9c9fb
http://www.nessus.org/u?cc50a9c7
http://www.nessus.org/u?b7885cda
https://www.suse.com/support/kb/doc/?id=000020564
https://www.vicarius.io/vsociety/posts/pwnkit-pkexec-lpe-cve-2021-4034
https://www.oracle.com/security-alerts/cpuapr2022.html
https://cert-portal.siemens.com/productcert/pdf/ssa-330556.pdf
Plugin Details
Severity: High
ID: 501030
Version: 1.12
Type: remote
Family: Tenable.ot
Published: 4/11/2023
Updated: 12/5/2024
Supported Sensors: Tenable OT Security
Risk Information
VPR
Risk Factor: Critical
Score: 9.8
CVSS v2
Risk Factor: High
Base Score: 7.2
Temporal Score: 6.3
Vector: CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C
CVSS Score Source: CVE-2021-4034
CVSS v3
Risk Factor: High
Base Score: 7.8
Temporal Score: 7.5
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:H/RL:O/RC:C
Vulnerability Information
CPE: cpe:/o:siemens:scalance_m804pb_firmware:7.2, cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_a%29_firmware:7.2, cpe:/o:siemens:scalance_m874-3_firmware:7.2, cpe:/o:siemens:scalance_m876-4_%28nam%29_firmware:7.2, cpe:/o:siemens:scalance_s615_eec_firmware:7.2, cpe:/o:siemens:scalance_lpe9403_firmware:2.0, cpe:/o:siemens:scalance_m876-3_%28evdo%29_firmware:7.2, cpe:/o:siemens:scalance_m816-1_adsl-router_%28annex_b%29_firmware:7.2, cpe:/o:siemens:scalance_s615_firmware:7.2, cpe:/o:siemens:ruggedcom_rm1224_lte%284g%29_eu_firmware:7.2, cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_a%29_firmware:7.2, cpe:/o:siemens:scalance_mum856-1_%28row%29_firmware:7.2, cpe:/o:siemens:scalance_m812-1_adsl-router_%28annex_b%29_firmware:7.2, cpe:/o:siemens:scalance_mum853-1_%28eu%29_firmware:7.2, cpe:/o:siemens:scalance_m874-2_firmware:7.2, cpe:/o:siemens:ruggedcom_rm1224_lte%284g%29_nam_firmware:7.2, cpe:/o:siemens:scalance_m876-4_%28eu%29_firmware:7.2, cpe:/o:siemens:scalance_m826-2_shdsl-router_firmware:7.2, cpe:/o:siemens:scalance_mum856-1_%28eu%29_firmware:7.2, cpe:/o:siemens:scalance_m876-4_firmware:7.2, cpe:/o:siemens:scalance_m876-3_%28rok%29_firmware:7.2
Required KB Items: Tenable.ot/Siemens
Exploit Available: true
Exploit Ease: Exploits are available
Patch Publication Date: 1/28/2022
Vulnerability Publication Date: 1/28/2022
CISA Known Exploited Vulnerability Due Dates: 7/18/2022
Exploitable With
CANVAS (CANVAS)
Core Impact
Metasploit (Local Privilege Escalation in polkits pkexec)
Reference Information
CVE: CVE-2021-4034