WebVirtCloud fails to properly validate permission flags in UserInstance grants, allowing view-only users to perform privileged actions. Attackers with read-only grants can power off virtual machines, reset root passwords, install SSH keys, and manage ISO images by exploiting the get_instance gate that only checks grant existence.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 6
https://github.com/retspen/webvirtcloud
disclosure@vulncheck.com
https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30a…
disclosure@vulncheck.com
https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30a…
disclosure@vulncheck.com
https://github.com/retspen/webvirtcloud/blob/1b2da68b2800f94674dd96f4a986cde30a…
disclosure@vulncheck.com
https://github.com/retspen/webvirtcloud/issues/682
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/webvirtcloud-missing-authorization-on-inst…
disclosure@vulncheck.com