CVE-2021-41991

Common vulnerabilities & exposures (CVE)

CVE database CVE database blogpost Release & EoL database

Published at: - 18-10-2021 04:15

Last modified: - 12-04-2022 08:42

Total changes: - 9

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Low

Attack complexity

Network

Attack vector

High

Availability

None

Confidentiality

None

Integrity

None

Privileges required

Unchanged

Scope

None

User interaction

7.5

Base score

3.9

3.6

Exploitability score

Impact score

Verification logic

vendor=strongswan AND product=strongswan AND versionStartIncluding=4.2.10 AND versionEndExcluding=5.9.4

vendor=Debian AND product=debian_linux AND version=9.0

vendor=Debian AND product=debian_linux AND version=10.0

vendor=Debian AND product=debian_linux AND version=11.0

vendor=fedoraproject AND product=fedora AND version=33

vendor=fedoraproject AND product=fedora AND version=34

vendor=fedoraproject AND product=fedora AND version=35

vendor=siemens AND product=sinema_remote_connect_server AND version=-

AND

vendor=siemens AND product=siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware AND version=-

vendor=siemens AND product=siplus_et_200sp_cp_1542sp-1_irc_tx_rail AND version=-

AND

vendor=siemens AND product=simatic_cp_1243-1_firmware AND version=-

vendor=siemens AND product=simatic_cp_1243-1 AND version=-

AND

vendor=siemens AND product=simatic_cp_1242-7_gprs_v2_firmware AND version=-

vendor=siemens AND product=simatic_cp_1242-7_gprs_v2 AND version=-

AND

vendor=siemens AND product=simatic_net_cp_1243-8_irc_firmware AND version=-

vendor=siemens AND product=simatic_net_cp_1243-8_irc AND version=-

AND

vendor=siemens AND product=scalance_sc632-2c_firmware AND version=-

vendor=siemens AND product=scalance_sc632-2c AND version=-

AND

vendor=siemens AND product=siplus_et_200sp_cp_1543sp-1_isec_firmware AND version=-

vendor=siemens AND product=siplus_et_200sp_cp_1543sp-1_isec AND version=-

AND

vendor=siemens AND product=cp_1543-1_firmware AND version=-

vendor=siemens AND product=cp_1543-1 AND version=-

AND

vendor=siemens AND product=simatic_net_cp_1545-1_firmware AND version=-

vendor=siemens AND product=simatic_net_cp_1545-1 AND version=-

AND

vendor=siemens AND product=simatic_cp_1543sp-1_firmware AND version=-

vendor=siemens AND product=simatic_cp_1543sp-1 AND version=-

AND

vendor=siemens AND product=simatic_net_cp1243-7_lte_eu_firmware AND version=-

vendor=siemens AND product=simatic_net_cp1243-7_lte_eu AND version=-

AND

vendor=siemens AND product=simatic_cp_1243-7_lte\/us_firmware AND version=-

vendor=siemens AND product=simatic_cp_1243-7_lte\/us AND version=-

AND

vendor=siemens AND product=simatic_cp_1542sp-1_firmware AND version=-

vendor=siemens AND product=simatic_cp_1542sp-1 AND version=-

AND

vendor=siemens AND product=scalance_sc636-2c_firmware AND version=-

vendor=siemens AND product=scalance_sc636-2c AND version=-

AND

vendor=siemens AND product=simatic_cp_1542sp-1_irc_firmware AND version=-

vendor=siemens AND product=simatic_cp_1542sp-1_irc AND version=-

AND

vendor=siemens AND product=scalance_sc642-2c_firmware AND version=-

vendor=siemens AND product=scalance_sc642-2c AND version=-

AND

vendor=siemens AND product=scalance_sc646-2c_firmware AND versionEndExcluding=2.3

vendor=siemens AND product=scalance_sc646-2c AND version=-

AND

vendor=siemens AND product=scalance_sc622-2c_firmware AND version=-

vendor=siemens AND product=scalance_sc622-2c AND version=-

AND

vendor=siemens AND product=siplus_s7-1200_cp_1243-1_rail_firmware AND version=-

vendor=siemens AND product=siplus_s7-1200_cp_1243-1_rail AND version=-

AND

vendor=siemens AND product=siplus_s7-1200_cp_1243-1_firmware AND version=-

vendor=siemens AND product=siplus_s7-1200_cp_1243-1 AND version=-

AND

vendor=siemens AND product=siplus_net_cp_1543-1_firmware AND version=-

vendor=siemens AND product=siplus_net_cp_1543-1 AND version=-

AND

vendor=siemens AND product=siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware AND version=-

vendor=siemens AND product=siplus_et_200sp_cp_1543sp-1_isec_tx_rail AND version=-

Reference

https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html
https://github.com/strongswan/strongswan/releases/tag/5.9.4
DSA-4989-Third Party Advisory
[debian-lts-announce] 20211019 [SECURITY] [DLA 2788-1] strongswan security update-Mailing List, Third Party Advisory
FEDORA-2021-b3df83339e-Mailing List, Third Party Advisory
FEDORA-2021-0b37146973-Mailing List, Third Party Advisory
FEDORA-2021-95fab6a482-Mailing List, Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf

Keywords

CVE-2021-41991

Common vulnerabilities & exposures (CVE)

Description

Common Vulnerability Scoring System (CVSS)

Verification logic

Reference

NVD

CVE-2021-41991

CVE

Common vulnerabilities & exposures

CVSS

Common vulnerability scoring system

Security

Vulnerabilities

Exposures