Kaseya Virtual System Administrator (VSA) 7.x before 7.0.0.33, 8.x before 8.0.0.23, 9.0 before 9.0.0.19, and 9.1 before 9.1.0.9 does not properly require authentication, which allows remote attackers to bypass authentication and (1) add an administrative account via crafted request to LocalAuth/setAccount.aspx or (2) write to and execute arbitrary files via a full pathname in the PathData parameter to ConfigTab/uploader.aspx.
Weakness
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Virtual_system_administrator | Kaseya | 7.0.0.0 (including) | 7.0.0.33 (excluding) |
| Virtual_system_administrator | Kaseya | 8.0.0.0 (including) | 8.0.0.23 (excluding) |
| Virtual_system_administrator | Kaseya | 9.0.0.0 (including) | 9.0.0.19 (excluding) |
| Virtual_system_administrator | Kaseya | 9.1.0.0 (including) | 9.1.0.9 (excluding) |
Potential Mitigations
Related Attack Patterns
- https://cwe.mitre.org/data/definitions/114.html
- https://cwe.mitre.org/data/definitions/115.html
- https://cwe.mitre.org/data/definitions/151.html
- https://cwe.mitre.org/data/definitions/194.html
- https://cwe.mitre.org/data/definitions/22.html
- https://cwe.mitre.org/data/definitions/57.html
- https://cwe.mitre.org/data/definitions/593.html
- https://cwe.mitre.org/data/definitions/633.html
- https://cwe.mitre.org/data/definitions/650.html
- https://cwe.mitre.org/data/definitions/94.html
References
- http://packetstormsecurity.com/files/133782/Kaseya-Virtual-System-Administrator-Code-Execution-Privilege-Escalation.html
- http://www.zerodayinitiative.com/advisories/ZDI-15-448
- http://www.zerodayinitiative.com/advisories/ZDI-15-449
- https://helpdesk.kaseya.com/entries/96164487--Kaseya-Security-Advisory
- https://www.exploit-db.com/exploits/38351/
- http://packetstormsecurity.com/files/133782/Kaseya-Virtual-System-Administrator-Code-Execution-Privilege-Escalation.html
- http://www.zerodayinitiative.com/advisories/ZDI-15-448
- http://www.zerodayinitiative.com/advisories/ZDI-15-449
- https://helpdesk.kaseya.com/entries/96164487--Kaseya-Security-Advisory
- https://www.exploit-db.com/exploits/38351/