Vulnerabilities / Threats

3/16/2009
04:58 PM
Connect Directly
Google+
LinkedIn
Twitter
RSS
E-Mail
50%
50%

Microsoft Stands By Its Latest Patch

The company is defending against claims that its MS09-008 security fix doesn't work and that the vulnerabilities could be used to hijack network traffic.

To counter claims that its MS09-008 patch doesn't work, Microsoft on Friday explained the proper way to fix the vulnerabilities identified in its Windows DNS server and Windows WINS server software.

"There are claims that this update is ineffective," Maarten Van Horenbeeck, Microsoft's Security Research and Defense Center program manager, said in a blog post on Friday. "Let me be clear that this update will protect you and it should be deployed as soon as possible."

The vulnerabilities have to do with DNS spoofing vulnerabilities, with the Web Proxy Auto-Discovery, or WPAD, and with the Intra-Site Automatic Tunnel Addressing Protocol, or ISATAP. If exploited, these flaws could be used to hijack network traffic.

WPAD provides a way to automatically configure the proxy settings of computers on a network.

"This vulnerability could be used to launch 'man-in-the-middle' attacks on Windows DNS servers," explained Luis Corrons, director of PandaLabs, in a blog post. "The Web browsers of the PCs in the network are configured through these WPAD entries, so a user that is getting the proxy configuration automatically could be redirected to a malicious proxy and the attacker will have access to all the traffic of the user. To perform this attack, the attacker could insert a WPAD entry in the DNS server when dynamic updates are enabled."

To fix this problem, Microsoft's patch adds a block list to its DNS server. The names on the list no longer resolve as domain names. This prevents an attack from registering a WPAD or ISATAP entry going forward.

But the patch does nothing to fix an entry registered before the patch was applied, a feature that Microsoft says is necessary to avoid negatively impacting legitimate users of these services. As a consequence, systems on which the MS09-008 vulnerability has already been exploited will remain infected after the patch.

"This is indeed not a scenario the security update, or any security update released by Microsoft, aims to address," explained Van Horenbeeck. "Security updates are intended to help protect the system against future exploitation, and don't aim to undo any attack that has taken place in the past. The update does not actively change the current configuration. When installing the update, it has no way of knowing whether the WPAD entry was configured by an administrator or an attacker."

To fix this, add "wpad" as one of the values in the GlobalQueryBlockList registry key and restart the DNS service, explained Corrons. This may not be the end of it, however, as compromised systems may have acquired additional malware.

Further details about MS09-008 can be found at the Microsoft Security Response Center blog.


InformationWeek has published an in-depth report on Windows 7. Download the report here (registration required).

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
More Than Half of Users Reuse Passwords
Curtis Franklin Jr., Senior Editor at Dark Reading,  5/24/2018
Is Threat Intelligence Garbage?
Chris McDaniels, Chief Information Security Officer of Mosaic451,  5/23/2018
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: This comment is waiting for review by our moderators.
Current Issue
Flash Poll
[Strategic Security Report] Navigating the Threat Intelligence Maze
[Strategic Security Report] Navigating the Threat Intelligence Maze
Most enterprises are using threat intel services, but many are still figuring out how to use the data they're collecting. In this Dark Reading survey we give you a look at what they're doing today - and where they hope to go.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2018-11471
PUBLISHED: 2018-05-25
Cockpit 0.5.5 has XSS via a collection, form, or region.
CVE-2018-11472
PUBLISHED: 2018-05-25
Monstra CMS 3.0.4 has Reflected XSS during Login (i.e., the login parameter to admin/index.php).
CVE-2018-11473
PUBLISHED: 2018-05-25
Monstra CMS 3.0.4 has XSS in the registration Form (i.e., the login parameter to users/registration).
CVE-2018-11474
PUBLISHED: 2018-05-25
Monstra CMS 3.0.4 has a Session Management Issue in the Administrations Tab. A password change at admin/index.php?id=users&action=edit&user_id=1 does not invalidate a session that is open in a different browser.
CVE-2018-11475
PUBLISHED: 2018-05-25
Monstra CMS 3.0.4 has a Session Management Issue in the Users tab. A password change at users/1/edit does not invalidate a session that is open in a different browser.