Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| veyon | veyon | < 0.11.5 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Exploit-DB 1
- Veyon 4.4.1 - 'VeyonService' Unquoted Service Path EDB-49925 · local · Jun 1, 2021
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- https://github.com/veyon/veyon/security/advisories/GHSA-c8cc-x786-hqqp
- https://github.com/veyon/veyon/issues/657
- https://github.com/veyon/veyon/commit/f231ec511b9a09f43f49b2c7bb7c60b8046276b1
- http://packetstormsecurity.com/files/162873/Veyon-4.4.1-Unquoted-Service-Path.html
- https://www.exploit-db.com/exploits/49925
- https://www.exploit-db.com/exploits/48246