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CVE-2021-41991

Published: 18 October 2021

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.

Notes

AuthorNote
mdeslaur
affects 4.2.10+

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
strongswan
Launchpad, Ubuntu, Debian
focal
Released (5.8.2-1ubuntu3.3)
hirsute
Released (5.9.1-1ubuntu1.2)
impish
Released (5.9.1-1ubuntu3.1)
jammy
Released (5.9.1-1ubuntu3.1)
trusty
Released (5.1.2-0ubuntu2.11+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (5.3.5-1ubuntu3.8+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
bionic
Released (5.6.2-1ubuntu2.7)
upstream Needs triage

kinetic
Released (5.9.1-1ubuntu3.1)
lunar
Released (5.9.1-1ubuntu3.1)
mantic
Released (5.9.1-1ubuntu3.1)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H