• Articles
    • Editorial Articles
    • Research Articles
    • WatchGuard Articles
  • The 443 Podcast
  • Threat Landscape
  • About
    • About Us
    • Contact Us
    • Contribute to Secplicity

Secplicity - Security Simplified

Powered by WatchGuard Technologies

Windows Updates Fix Relatively Minor Kernel and Kerberos Flaws

October 9, 2012 By Corey Nachreiner

Severity: Medium

Summary:

  • These vulnerabilities affect: All current versions of Windows and the components that ship with it
  • How an attacker exploits them: Multiple vectors of attack, including sending specially crafted network traffic and enticing users to run malicious applications
  • Impact: In the worst case, a local attacker can gain complete control of your Windows computer
  • What to do: Install the appropriate Microsoft patches as soon as possible, or let Windows Automatic Update do it for you.

Exposure:

Today, Microsoft released two security bulletins describing vulnerabilities that affect Windows and components that ship with it. Each vulnerability affects different versions of Windows to varying degrees. We summarize these Windows bulletins below:

  • MS12-068: Kernel Elevation of Privilege Vulnerability

The kernel is the core component of any computer operating system. The Windows kernel suffers from an integer overflow vulnerability, which attackers can leverage to  elevate their privilege. By running a specially crafted program, a local attacker could exploit this flaw to gain complete control of your PC. However, the attacker would first need to gain local access to your Windows computer using valid credentials. This factor significantly reduces the severity of the issue

Microsoft rating: Important

  • MS12-069: Kerberos DoS Vulnerability

Kerberos is one of the authentication protocols used by Windows Servers. The Kerberos service suffers from a Denial of Service (DoS) vulnerability involving the way it handles specially crafted session requests. By sending specially crafted network traffic, an attacker could leverage this flaw to crash and restart your Kerberos server. The attacker could repeatedly exploit this vulnerability to keep your server offline for as long as they continued their attack. That said, most administrators do not allow Internet-based users access to their Kerberos server, which significantly mitigates the severity of this vulnerability

Microsoft rating: Important

Solution Path:

Microsoft has released Windows patches that correct all of these vulnerabilities. You should download, test, and deploy the appropriate Windows patches throughout your network immediately. If you choose, you can also let Windows Update automatically download and install these updates for you.

The links below point directly to the “Affected and Non-Affected Software” section of each bulletin, where you can find the various updates:

  • MS12-068
  • MS12-069

For All WatchGuard Users:

Though WatchGuard’s XTM appliances can mitigate some of these attacks, by preventing Internet-based attackers from accessing the vulnerable services, it cannot prevent local attacks. Therefore, we recommend you install Microsoft’s updates  to completely protect yourself from these flaws.

Status:

Microsoft has released patches correcting these issues.

References:

  • Microsoft Security Bulletin MS12-068
  • Microsoft Security Bulletin MS12-069

This alert was researched and written by Corey Nachreiner, CISSP (@SecAdept).


What did you think of this alert? Let us know at [email protected].

Share This:

Related

Filed Under: Security Bytes Tagged With: DoS, Kerberos, kernel, Microsoft, Updates and patches

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

The 443 Podcast

A weekly podcast featuring the leading white-hat hackers and security researchers. Listen Now
the 443 podcast

Threat Landscape

Filter and view Firebox Feed data by type of attack, region, country, and date range. View Now
threat landscape

Top Posts

  • Cybersecurity News: Free Cybersecurity Training, TrickBot Group Exposed, Major GoDaddy Breach, and Russia to Legalize cybercrime?!
  • US National Cybersecurity Strategy
  • Here Come The Regulations
  • Cybersecurity’s Toll on Mental Health

Email Newsletter

Sign up to get the latest security news and threat analysis delivered straight to your inbox

By signing up you agree to our Privacy Policy.


The views and opinions expressed on this website are those of the authors and do not necessarily reflect the policy or position of WatchGuard Technologies.

Stay in Touch

Recent Posts

  • Cybersecurity News: LastPass Incident Revealed, White House Issues Cybersecurity Strategy, FBI Purchases Leaked USHOR PII Data, and a Slew of Other Breaches
  • An Update on Section 230
  • Here Come The Regulations
  • US National Cybersecurity Strategy
  • Cybersecurity News: Free Cybersecurity Training, TrickBot Group Exposed, Major GoDaddy Breach, and Russia to Legalize cybercrime?!
View All

Search

Archives

Copyright © 2023 WatchGuard Technologies · Cookie Policy · Privacy Policy · Terms of Use