Siemens (CVE-2021-41991)
high Tenable.ot Plugin ID 500650
Synopsis
The remote OT asset is affected by a vulnerability.Description
The in-memory certificate cache in strongSwan before 5.9.4 has a remote integer overflow upon receiving many requests with different certificates to fill the cache and later trigger the replacement of cache entries. The code attempts to select a less-often-used cache entry by means of a random number generator, but this is not done correctly. Remote code execution might be a slight possibility.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
http://www.nessus.org/u?845a2df0
https://github.com/strongswan/strongswan/releases/tag/5.9.4
https://www.debian.org/security/2021/dsa-4989
https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html
http://www.nessus.org/u?cd6b6abd
http://www.nessus.org/u?ea295ec8
http://www.nessus.org/u?d5453363
https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf
Plugin Details
Severity: High
ID: 500650
Version: 1.1
Type: remote
Family: Tenable.ot
Published: 4/28/2022
Updated: 4/28/2022
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
CVSS v2
Risk Factor: Medium
Base Score: 5
Vector: AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS Score Source: CVE-2021-41991
CVSS v3
Risk Factor: High
Base Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vulnerability Information
CPE: cpe:/o:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware:-, cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware:-, cpe:/o:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware:-, cpe:/o:siemens:siplus_s7-1200_cp_1243-1_firmware:-, cpe:/o:siemens:siplus_s7-1200_cp_1243-1_rail_firmware:-
Required KB Items: Tenable.ot/Siemens
Exploit Ease: No known exploits are available
Patch Publication Date: 10/18/2021
Vulnerability Publication Date: 10/18/2021
Reference Information
CVE: CVE-2021-41991