Bug 2015613 (CVE-2021-41991)

Summary:	CVE-2021-41991 strongswan: integer overflow when replacing certificates in cache
Product:	[Other] Security Response	Reporter:	Guilherme de Almeida Suckevicz <gsuckevi>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	code, davide, michel, mikhail.zabaluev, paul.wouters, pemensik, rhel-crypto-maint
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	strongSwan 5.9.4	Doc Type:	No Doc Update
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2021-10-20 08:08:32 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	2015614, 2015615
Bug Blocks:	2015618

Description Guilherme de Almeida Suckevicz 2021-10-19 16:24:45 UTC

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.

References:
https://www.strongswan.org/blog/2021/10/18/strongswan-vulnerability-(cve-2021-41991).html
https://github.com/strongswan/strongswan/releases/tag/5.9.4

Comment 1 Guilherme de Almeida Suckevicz 2021-10-19 16:26:01 UTC

Created strongswan tracking bugs for this issue:

Affects: epel-all [bug 2015615]
Affects: fedora-all [bug 2015614]

Comment 3 Product Security DevOps Team 2021-10-20 08:08:32 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-41991