CVE-2021-41991

CVSS V2 Medium 5 CVSS V3 High 7.5

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.

Overview

CVE ID
CVE-2021-41991

Assigner
cve@mitre.org

Vulnerability Status
Analyzed

Published Version
2021-10-18T14:15:10

Last Modified Date
2022-04-12T18:42:02

Weakness Enumerations

CWE	URL
CWE-190	http://cwe.mitre.org/data/definitions/190.html

CPE Configuration (Product)

CPE	Vulnerable	Operator	Version Start	Version End
		AND
cpe:2.3:a:strongswan:strongswan::::::::	1	OR	4.2.10	5.9.4
		AND
cpe:2.3:o:debian:debian_linux:9.0:::::::*	1	OR
cpe:2.3:o:debian:debian_linux:10.0:::::::*	1	OR
cpe:2.3:o:debian:debian_linux:11.0:::::::*	1	OR
		AND
cpe:2.3:o:fedoraproject:fedora:33:::::::*	1	OR
cpe:2.3:o:fedoraproject:fedora:34:::::::*	1	OR
cpe:2.3:o:fedoraproject:fedora:35:::::::*	1	OR
		AND
cpe:2.3:a:siemens:sinema_remote_connect_server:-:::::::*	1	OR
		AND
cpe:2.3:o:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:siplus_et_200sp_cp_1542sp-1_irc_tx_rail:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_cp_1243-1_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_cp_1243-1:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_cp_1242-7_gprs_v2_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_cp_1242-7_gprs_v2:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_net_cp_1243-8_irc_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_net_cp_1243-8_irc:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:scalance_sc632-2c_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:scalance_sc632-2c:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:siplus_et_200sp_cp_1543sp-1_isec_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:siplus_et_200sp_cp_1543sp-1_isec:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:cp_1543-1_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:cp_1543-1:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_net_cp_1545-1_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_net_cp_1545-1:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_cp_1543sp-1_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_cp_1543sp-1:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_net_cp1243-7_lte_eu_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_net_cp1243-7_lte_eu:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_cp_1243-7_lte\/us_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_cp_1243-7_lte\/us:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_cp_1542sp-1_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_cp_1542sp-1:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:scalance_sc636-2c_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:scalance_sc636-2c:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:simatic_cp_1542sp-1_irc_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:simatic_cp_1542sp-1_irc:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:scalance_sc642-2c_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:scalance_sc642-2c:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:scalance_sc646-2c_firmware::::::::	1	OR		2.3
cpe:2.3:h:siemens:scalance_sc646-2c:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:scalance_sc622-2c_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:scalance_sc622-2c:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:siplus_s7-1200_cp_1243-1_rail_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:siplus_s7-1200_cp_1243-1_rail:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:siplus_s7-1200_cp_1243-1_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:siplus_s7-1200_cp_1243-1:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:siplus_net_cp_1543-1_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:siplus_net_cp_1543-1:-:::::::*	0	OR
		AND
cpe:2.3:o:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware:-:::::::*	1	OR
cpe:2.3:h:siemens:siplus_et_200sp_cp_1543sp-1_isec_tx_rail:-:::::::*	0	OR

CVSS Version 2

Version
2.0

Vector String
AV:N/AC:L/Au:N/C:N/I:N/A:P

Access Vector
NETWORK

Access Compatibility
LOW

Authentication
NONE

Confidentiality Impact
NONE

Integrity Impact
NONE

Availability Impact
PARTIAL

Base Score
5

Severity
MEDIUM

Exploitability Score
10

Impact Score
2.9

CVSS Version 3

Version
3.1

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

Attack Vector
NETWORK

Attack Compatibility
LOW

Privileges Required
NONE

User Interaction
NONE

Scope
UNCHANGED

Confidentiality Impact
NONE

Availability Impact
HIGH

Base Score
7.5

Base Severity
HIGH

Exploitability Score
3.9

Impact Score
3.6

References

Reference URL	Reference Tags
https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html	Exploit Vendor Advisory
https://github.com/strongswan/strongswan/releases/tag/5.9.4	Third Party Advisory
https://www.debian.org/security/2021/dsa-4989	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/	Mailing List Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/	Mailing List Third Party Advisory
https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf	Patch Third Party Advisory

Sources

Source Name	Source URL
NIST	https://nvd.nist.gov/vuln/detail/CVE-2021-41991
MITRE	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41991

History

Created	Old Value	New Value	Data Type	Notes
2022-05-10 15:43:18				Added to TrackCVE
2022-12-05 12:34:24	2021-10-18T14:15Z	2021-10-18T14:15:10	CVE Published Date	updated
2022-12-05 12:34:24		2022-04-12T18:42:02	CVE Modified Date	updated
2022-12-05 12:34:24		Analyzed	Vulnerability Status	updated