Elevation of privilege in Task Scheduler in Microsoft Windows

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU18571

Risk: Low

CVSSv3.1: 7.4 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:U/RC:C]

CVE-ID: N/A

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to the "_SchRpcRegisterTask" RPC endpoint within the Windows Task Scheduler that does not check for permissions when registering new tasks. A local unprivileged user can execute arbitrary code on the target system with elevated privileges.

Mitigation

Cybersecurity Help is currently unaware of any official solution to address this vulnerability.

Vulnerable software versions

Windows: 10 - 10 Gold

External links

http://github.com/SandboxEscaper/polarbearrepo/tree/master/bearlpe

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.