Integer Overflow in strongSwan's Certificate Cache
CVE-2021-41991

7.5HIGH

Key Information:

Vendor

Strongswan

Status
Strongswan
Vendor
CVE Published:
18 October 2021

What is CVE-2021-41991?

A vulnerability in the in-memory certificate cache of strongSwan prior to version 5.9.4 allows for a remote integer overflow attack. This issue arises when the system receives numerous requests with varying certificates, overfilling the cache and subsequently triggering the replacement of cache entries. Although the system aims to select less-frequently used cache entries via a random number generator, this process is flawed. This imperfection could potentially enable remote code execution under specific circumstances.

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References

https://github.com/strongswan/strongswan/releases/tag/5.9.4
x_refsource_MISC
https://www.strongswan.org/blog/2021/10/18/strongswan-vul...
x_refsource_CONFIRM
https://www.debian.org/security/2021/dsa-4989
vendor-advisoryx_refsource_DEBIAN

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

JSON
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