Vulnerabilities / Threats
3/16/2009
04:58 PM
Connect Directly
LinkedIn
Twitter
Google+
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
Register for Dark Reading Newsletters
White Papers
Cartoon
Current Issue
Flash Poll
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2015-3216
Published: 2015-07-07
Race condition in a certain Red Hat patch to the PRNG lock implementation in the ssleay_rand_bytes function in OpenSSL, as distributed in openssl-1.0.1e-25.el7 in Red Hat Enterprise Linux (RHEL) 7 and other products, allows remote attackers to cause a denial of service (application crash) by establi...

CVE-2014-3653
Published: 2015-07-06
Cross-site scripting (XSS) vulnerability in the template preview function in Foreman before 1.6.1 allows remote attackers to inject arbitrary web script or HTML via a crafted provisioning template.

CVE-2014-5406
Published: 2015-07-06
The Hospira LifeCare PCA Infusion System before 7.0 does not validate network traffic associated with sending a (1) drug library, (2) software update, or (3) configuration change, which allows remote attackers to modify settings or medication data via packets on the (a) TELNET, (b) HTTP, (c) HTTPS, ...

CVE-2014-9737
Published: 2015-07-06
Open redirect vulnerability in the Language Switcher Dropdown module 7.x-1.x before 7.x-1.4 for Drupal allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in a block.

CVE-2014-9738
Published: 2015-07-06
Multiple cross-site scripting (XSS) vulnerabilities in the Tournament module 7.x-1.x before 7.x-1.2 for Drupal allow remote authenticated users with certain permissions to inject arbitrary web script or HTML via an (1) account username, a (2) node title, or a (3) team entity title.

Dark Reading Radio
Archived Dark Reading Radio
Marc Spitler, co-author of the Verizon DBIR will share some of the lesser-known but most intriguing tidbits from the massive report