| VID |
28319 |
| Severity |
40 |
| Port |
139,445 |
| Protocol |
TCP |
| Class |
SMB |
| Detailed Description |
A user with the Modify Firmware Environment Values privilege is detected. Modify firmware environment values allows a user to modify system environment variables stored in nonvolatile RAM. This right is normally given only to Administrators. A normal user with this right can change environment values and obtain higher access levels.
* Note: This check requires an account with administrative privileges which can log into the host to scan. Absence of these condition will result in the check not being performed and a False Negative for all vulnerable hosts.
* References:
http://support.microsoft.com/default.aspx?scid=kb;[LN];101366
http://hq.mcafeeasap.com/vulnerabilities/vuln_data/23000.asp
http://www.statonline.com/technologies/sec_articles/rights.asp
* Platforms Affected:
Windows Any version |
| Recommendation |
Check user rights for the Modify Firmware Environment Values, and remove any names disallowed by your security policy.
To audit and revoke this privilege:
For Windows NT:
1. Open User Manager (From the Windows NT Start menu, select Programs, Administrative Tools (Common), and User Manager).
2. From the Policies menu, select User Rights to display the User Rights Policy dialog box.
3. Select the Show Advanced User Rights check box.
4. From the Right list, select Modify Firmware Environment Values.
5. Verify this right is set in accordance with your administration policy.
6. To remove a user, select the user and click Remove.
For a Windows 2000 domain:
1. Start Microsoft Management Console (mmc). From the Windows Start menu, select Run, type mmc, and click OK.
2. Add Group Policy Snap-in.
3. Browse Group Policy Objects.
4. Select the Domain Policy of interest.
5. Traverse the following path:
Computer Configuration, Windows Settings, Security Settings, Local Policies, User Rights Assignment and Modify Firmware Environment Values.
6. Set the user right to desired setting according to your administration policy.
For a stand-alone Windows 2000 computer:
1. On the affected computer, start gpedit.msc. From the Windows Start menu, select Run, type gpedit.msc, and click OK. The focus is local computer by default.
2. Traverse the following path:
Computer Configuration, Windows Settings, Security Settings, Local Policies, User Rights Assignment and Modify Firmware Environment Values
3. Set the user right to desired setting according to your administration policy.
For Windows XP, 2003, 7, 2008, 8, 2012, 10, 2016, 2019 computer:
1. On the affected computer, start gpedit.msc. From the Windows Start menu, select Run, type gpedit.msc, and click OK. The focus is local computer by default.
2. Traverse the following path:
Computer Configuration, Windows Settings, Security Settings, Local Policies, User Rights Assignment and Modify Firmware Environment Values
3. Set the user right to desired setting according to your administration policy. |
| Related URL |
CVE-1999-0534 (CVE) |
| Related URL |
(SecurityFocus) |
| Related URL |
253 (ISS) |
|
