Tenable · Tenable Appliance · CVE-2017-8051
**Name of the Vulnerable Software and Affected Versions**
Tenable Appliance versions 3.5 through 4.4.0
Tenable Appliance versions prior to 3.5
**Description**
The issue is related to a flaw in the simpleupload.py script in the Web UI, which allows a remote attacker to inject arbitrary commands by manipulating the `tns appliance session user` parameter. This can enable the attacker to execute commands remotely.
**Recommendations**
For Tenable Appliance versions 3.5 through 4.4.0, consider disabling the simpleupload.py script in the Web UI until a patch is available.
For Tenable Appliance versions prior to 3.5, restrict access to the Web UI to minimize the risk of exploitation.
As a temporary workaround, avoid using the `tns appliance session user` parameter in the affected API endpoint until the issue is resolved.