Vulnerability CVE-2021-41991


Published: 2021-10-18

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.

Type:

CWE-190

(Integer Overflow or Wraparound)

CVSS2 => (AV:N/AC:L/Au:N/C:N/I:N/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
5/10
2.9/10
10/10
Exploit range
Attack complexity
Authentication
Remote
Low
No required
Confidentiality impact
Integrity impact
Availability impact
None
None
Partial
Affected software
Strongswan -> Strongswan 
Debian -> Debian linux 

 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
https://www.debian.org/security/2021/dsa-4989
https://lists.debian.org/debian-lts-announce/2021/10/msg00014.html

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