Executive Summary
Summary | |
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Title | Microsoft Windows Does Not Disable AutoRun Properly |
Informations | |||
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Name | TA09-020A | First vendor Publication | 2009-01-20 |
Vendor | US-CERT | Last vendor Modification | 2009-01-20 |
Severity (Vendor) | N/A | Revision | N/A |
Security-Database Scoring CVSS v3
Cvss vector : N/A | |||
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Overall CVSS Score | NA | ||
Base Score | NA | Environmental Score | NA |
impact SubScore | NA | Temporal Score | NA |
Exploitabality Sub Score | NA | ||
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : (AV:L/AC:L/Au:N/C:C/I:C/A:C) | |||
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Cvss Base Score | 7.2 | Attack Range | Local |
Cvss Impact Score | 10 | Attack Complexity | Low |
Cvss Expoit Score | 3.9 | Authentication | None Required |
Calculate full CVSS 2.0 Vectors scores |
Detail
Disabling AutoRun on Microsoft Windows systems can help prevent the spread of malicious code. However, Microsoft's guidelines for disabling AutoRun are not fully effective, which could be considered a vulnerability. I. Description Microsoft Windows includes an AutoRun feature, which can automatically run code when removable devices are connected to the computer. AutoRun (and the closely related AutoPlay) can unexpectedly cause arbitrary code execution in the following situations: * A removable device is connected to a computer. This includes, but is not limited to, inserting a CD or DVD, connecting a USB or Firewire device, or mapping a network drive. This connection can result in code execution without any additional user interaction. * A user clicks the drive icon for a removable device in Windows Explorer. Rather than exploring the drive's contents, this action can cause code execution. * The user selects an option from the AutoPlay dialog that is displayed when a removable device is connected. Malicious software, such as W32.Downadup, is using AutoRun to spread. Disabling AutoRun, as specified in the CERT/CC Vulnerability Analysis blog, is an effective way of helping to prevent the spread of malicious code. The Autorun and NoDriveTypeAutorun registry values are both ineffective for fully disabling AutoRun capabilities on Microsoft Windows systems. Setting the Autorun registry value to 0 will not prevent newly connected devices from automatically running code specified in the Autorun.inf file. It will, however, disable Media Change Notification (MCN) messages, which may prevent Windows from detecting when a CD or DVD is changed. According to Microsoft, setting the NoDriveTypeAutorun registry value to 0xFF "disables Autoplay on all types of drives." Even with this value set, Windows may execute arbitrary code when the user clicks the icon for the device in Windows Explorer. II. Impact By placing an Autorun.inf file on a device, an attacker may be able to automatically execute arbitrary code when the device is connected to a Windows system. Code execution may also take place when the user attempts to browse to the software location with Windows Explorer. III. Solution Disable AutoRun in Microsoft Windows To effectively disable AutoRun in Microsoft Windows, import the following registry value: REGEDIT4 To import this value, perform the following steps: * Copy the text Microsoft Windows can also cache the AutoRun information from mounted devices in the MountPoints2 registry key. We recommend restarting Windows after making the registry change so that any cached mount points are reinitialized in a way that ignores the Autorun.inf file. Alternatively, the following registry key may be deleted: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MountPoints2 Once these changes have been made, all of the AutoRun code execution scenarios described above will be mitigated because Windows will no longer parse Autorun.inf files to determine which actions to take. Further details are available in the CERT/CC Vulnerability Analysis blog. Thanks to Nick Brown and Emin Atac for providing the workaround. |
Original Source
Url : http://www.us-cert.gov/cas/techalerts/TA09-020A.html |
CWE : Common Weakness Enumeration
% | Id | Name |
---|---|---|
100 % | CWE-16 | Configuration |
CPE : Common Platform Enumeration
Type | Description | Count |
---|---|---|
Os | 1 | |
Os | 4 | |
Os | 3 | |
Os | 3 | |
Os | 4 |
OpenVAS Exploits
Date | Description |
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2009-02-02 | Name : Microsoft Autorun Arbitrary Code Execution Vulnerability (08-038) File : nvt/secpod_ms08-038.nasl |
Open Source Vulnerability Database (OSVDB)
Id | Description |
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56513 | Microsoft Windows Autorun / NoDriveTypeAutoRun Registry Value Enforcement Wea... |