On Windows the Veyon Service before version 4.4.2 contains an unquoted service path vulnerability, allowing locally authenticated users with administrative privileges to run malicious executables with LocalSystem privileges. Since Veyon users (both students and teachers) usually don't have administrative privileges, this vulnerability is only dangerous in anyway unsafe setups. The problem has been fixed in version 4.4.2. As a workaround, the exploitation of the vulnerability can be prevented by revoking administrative privileges from all potentially untrustworthy users.
The product uses a search path that contains an unquoted element, in which the element contains whitespace or other separators. This can cause the product to access resources in a parent path.
| Link | Tags |
|---|---|
| https://github.com/veyon/veyon/security/advisories/GHSA-c8cc-x786-hqqp | third party advisory |
| https://github.com/veyon/veyon/issues/657 | third party advisory issue tracking |
| https://github.com/veyon/veyon/commit/f231ec511b9a09f43f49b2c7bb7c60b8046276b1 | third party advisory patch |
| http://packetstormsecurity.com/files/162873/Veyon-4.4.1-Unquoted-Service-Path.html | third party advisory vdb entry exploit |
| https://www.exploit-db.com/exploits/49925 | third party advisory vdb entry exploit |
| https://www.exploit-db.com/exploits/48246 | third party advisory vdb entry exploit |