CVE-2021-41991 Information

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.

CVSS Vector

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

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 https://www.debian.org/security/2021/dsa-4989 https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/WQSQ3BEC22NF4NCDZVCT4P3Q2ZIAJXGJ/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/5FJSATD2R2XHTG4P63GCMQ2N7EWKMME5/ https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Y3TQ32JLJOBJDB2EJKSX2PBPB5NFG2D4/ https://cert-portal.siemens.com/productcert/pdf/ssa-539476.pdf

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5