Vulnerability Monitor

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CVE-2021-41991

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.

Published

2021-10-18T14:15:10.333

Last Modified

2024-11-21T06:27:02.090

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 7.5 (HIGH)

CVSSv2 Vector

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

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: NONE
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

2.9

Weaknesses

Type: Primary
CWE-190

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	strongswan	strongswan	< 5.9.4	Yes
Operating System	debian	debian_linux	9.0	Yes
Operating System	debian	debian_linux	10.0	Yes
Operating System	debian	debian_linux	11.0	Yes
Operating System	fedoraproject	fedora	33	Yes
Operating System	fedoraproject	fedora	34	Yes
Operating System	fedoraproject	fedora	35	Yes
Application	siemens	sinema_remote_connect_server	-	Yes
Operating System	siemens	siplus_et_200sp_cp_1542sp-1_irc_tx_rail_firmware	-	Yes
Hardware	siemens	siplus_et_200sp_cp_1542sp-1_irc_tx_rail	-	No
Operating System	siemens	simatic_cp_1243-1_firmware	-	Yes
Hardware	siemens	simatic_cp_1243-1	-	No
Operating System	siemens	simatic_cp_1242-7_gprs_v2_firmware	-	Yes
Hardware	siemens	simatic_cp_1242-7_gprs_v2	-	No
Operating System	siemens	simatic_net_cp_1243-8_irc_firmware	-	Yes
Hardware	siemens	simatic_net_cp_1243-8_irc	-	No
Operating System	siemens	scalance_sc632-2c_firmware	-	Yes
Hardware	siemens	scalance_sc632-2c	-	No
Operating System	siemens	siplus_et_200sp_cp_1543sp-1_isec_firmware	-	Yes
Hardware	siemens	siplus_et_200sp_cp_1543sp-1_isec	-	No
Operating System	siemens	cp_1543-1_firmware	-	Yes
Hardware	siemens	cp_1543-1	-	No
Operating System	siemens	simatic_net_cp_1545-1_firmware	-	Yes
Hardware	siemens	simatic_net_cp_1545-1	-	No
Operating System	siemens	simatic_cp_1543sp-1_firmware	-	Yes
Hardware	siemens	simatic_cp_1543sp-1	-	No
Operating System	siemens	simatic_net_cp1243-7_lte_eu_firmware	-	Yes
Hardware	siemens	simatic_net_cp1243-7_lte_eu	-	No
Operating System	siemens	simatic_cp_1243-7_lte\/us_firmware	-	Yes
Hardware	siemens	simatic_cp_1243-7_lte\/us	-	No
Operating System	siemens	simatic_cp_1542sp-1_firmware	-	Yes
Hardware	siemens	simatic_cp_1542sp-1	-	No
Operating System	siemens	scalance_sc636-2c_firmware	-	Yes
Hardware	siemens	scalance_sc636-2c	-	No
Operating System	siemens	simatic_cp_1542sp-1_irc_firmware	-	Yes
Hardware	siemens	simatic_cp_1542sp-1_irc	-	No
Operating System	siemens	scalance_sc642-2c_firmware	-	Yes
Hardware	siemens	scalance_sc642-2c	-	No
Operating System	siemens	scalance_sc646-2c_firmware	< 2.3	Yes
Hardware	siemens	scalance_sc646-2c	-	No
Operating System	siemens	scalance_sc622-2c_firmware	-	Yes
Hardware	siemens	scalance_sc622-2c	-	No
Operating System	siemens	siplus_s7-1200_cp_1243-1_rail_firmware	-	Yes
Hardware	siemens	siplus_s7-1200_cp_1243-1_rail	-	No
Operating System	siemens	siplus_s7-1200_cp_1243-1_firmware	-	Yes
Hardware	siemens	siplus_s7-1200_cp_1243-1	-	No
Operating System	siemens	siplus_net_cp_1543-1_firmware	-	Yes
Hardware	siemens	siplus_net_cp_1543-1	-	No
Operating System	siemens	siplus_et_200sp_cp_1543sp-1_isec_tx_rail_firmware	-	Yes
Hardware	siemens	siplus_et_200sp_cp_1543sp-1_isec_tx_rail	-	No

References

https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf Patch, Third Party Advisory ([email protected])
https://github.com/strongswan/strongswan/releases/tag/5.9.4 Third Party Advisory ([email protected])
https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html Mailing List, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ ([email protected])
https://www.debian.org/security/2021/dsa-4989 Third Party Advisory ([email protected])
https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html ([email protected])
https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/strongswan/strongswan/releases/tag/5.9.4 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ (af854a3a-2127-422b-91ae-364da2661108)
https://www.debian.org/security/2021/dsa-4989 Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-%28cve-2021-41991%29.html (af854a3a-2127-422b-91ae-364da2661108)