The server implementation of the EAP-MSCHAPv2 protocol in the eap-mschapv2 plugin in strongSwan 4.2.12 through 5.x before 5.3.4 does not properly validate local state, which allows remote attackers to bypass authentication via an empty Success message in response to an initial Challenge message.
The MITRE CVE dictionary describes this issue as:
Find out more about CVE-2015-8023 from the MITRE CVE dictionary dictionary and NIST NVD.
This issue did not affect the versions of strongimcv as shipped with Red Hat Enterprise Linux 7, as they did not include support for the eap-mschapv2 plugin.
NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.
| Base Score | 6.4 |
|---|---|
| Base Metrics | AV:N/AC:L/Au:N/C:P/I:P/A:N |
| Access Vector | Network |
| Access Complexity | Low |
| Authentication | None |
| Confidentiality Impact | Partial |
| Integrity Impact | Partial |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Package | State |
|---|---|---|
| Red Hat Enterprise Linux 7 | strongimcv | Not affected |
Vulmon