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In October 2021 and January 2022, Strongswan.org disclosed[1, 2] vulnerabilities that could lead to denial-of-service attacks or bypass EAP authentication. These vulnerabilities could affect IPsec services in the management or data plane of ACOS devices and are addressed in this document.
| Item | Score | |||
| # | Vulnerability ID | Source | Score | Summary |
| 1 | CVE-2021-41991 | CVSSv3 | 7.5 High | strongswan: integer overflow when replacing certificates in cache[3] |
| 2 | CVE-2021-45079 | CVSSv3 | 9.1 Critical | strongswan: Incorrect Handling of Early EAP-Success Messages[4] |
The table below indicates releases of ACOS exposed to this vulnerability and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.
Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.
| Releases Affected | Releases Resolved or Unaffected |
|---|---|
| 5.0.0 – 5.2.1-P5 | 5.2.1-P6 |
| 4.1.4-GR1 – 4.1.4-GR1-P11 | 4.1.4-GR1-P12 |
None
Software updates that address these vulnerabilities are or will be published at the following URL: https://support.a10networks.com/
The following table shares brief descriptions for the vulnerabilities addressed in this document.
| Vulnerability ID | Vulnerability Description |
|---|---|
| CVE-2021-41991 |
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. |
| CVE-2021-45079 |
In strongSwan before 5.9.5, a malicious responder can send an EAP-Success message too early without actually authenticating the client and (in the case of EAP methods with mutual authentication and EAP-only authentication for IKEv2) even without server authentication. |
| Ref # | General Link |
|---|---|
| 1 | strongSwan Vulnerability (CVE-2021-41991) |
| 2 | strongSwan Vulnerability (CVE-2021-45079) |
| 3 | NIST NVD, CVE-2021-41991 |
| 4 | NIST NVD, CVE-2021-45079 |
None
| Revision | Date | Description |
|---|---|---|
| 1 | October 31, 2022 |
Initial Publication |
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