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Microsoft is patching a dangerous Windows DNS Server exploit
SigRed is a dangerous flaw that should be patched immediately.Security researchers have discovered a serious flaw in Windows’ Domain Name System software that users must patch immediately. Sagi Tzaik from Check Point found a way to run malicious code which can be used to hijack websites, intercept emails, steal private information and take sites offline. Microsoft has already acknowledged the issue and has issued a fix in today’s Patch Tuesday update, which it urges all users to download immediately.
The vulnerability has been codenamed SigRed and Check Point says it affects Windows Server versions from 2003 to 2019. Microsoft said that the flaw is “wormable,” enabling hackers to take over multiple machines at once and causing large amounts of damage. That’s especially a risk for big corporate customers that run their own platforms, especially since the exploit is fairly easy to
take advantage of.
Photo shows a 5 minute DNSlog of the actual attacks against BNS DNS server:
A suggested quick Registry edit is as follows:
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.
To work around this vulnerability, make the following registry change to restrict the size of the largest inbound TCP-based DNS response packet that’s allowed:
Value data: 0xFF00
- The default (also maximum) Value data = 0xFFFF.
- The recommended Value data = 0xFF00 (255 bytes less than the maximum).
- You must restart the DNS Service for the registry change to take effect. To do this, run the following command at an elevated command prompt:
net stop dns && net start dns
After the workaround is implemented, a Windows DNS server will be unable to resolve DNS names for its clients if the DNS response from the upstream server is larger than 65,280 bytes.
Important information about this workaround
TCP-based DNS response packets that exceed the recommended value will be dropped without error. Therefore, it is possible that some queries might not be answered. This could cause an unanticipated failure. A DNS server will be negatively impacted by this workaround only if it receives valid TCP responses that are greater than allowed in the previous mitigation (more than 65,280 bytes).
The reduced value is unlikely to affect standard deployments or recursive queries. However, a non-standard use-case may exist in a given environment. To determine whether the server implementation will be adversely affected by this workaround, you should enable diagnostic logging, and capture a sample set that is representative of your typical business flow. Then, you will have to review the log files to identify the presence of anomalously large TCP response packets
What is Foreman?
Foreman is an open source project that helps system administrators manage servers throughout their lifecycle, from provisioning and configuration to orchestration and monitoring. Provisioning support gives you easy control of setting up new servers, and using configuration management (Puppet, Ansible, Chef and Salt are supported), you can easily automate repetitive tasks. With Foreman, you can quickly deploy applications, and proactively manage change, both on-premise with VMs and bare-metal or in the cloud. Foreman scales well to multiple locations (offices, data centres, etc) and multiple organisations, allowing you to grow without losing your single source of infrastructure truth.
Learn how Tzar Umang dealt with a WordPress site, whose size was around 5GB to eventually load in 2 seconds!
Tzar will share with the participants the tools that he used:
1. WP Rocket
3. Imagify.io (ultra compression)
1. PHP Compress – cPanel
2. Content Delivery // Packet Compression (made with python)
To reserve your slot, kindly register for the FREE event here.
Here are some primer and tips from the US Homeland Security on securing your network against potential collateral attacks and damage brought on by the US-Iran conflict.
Potential for Iranian Cyber Response to U.S. Military Strike in Baghdad
The following is a composite of actionable technical recommendations for IT professionals and providers to reduce their overall vulnerability. These recommendations are not exhaustive; rather they focus on the actions that will likely have the highest return on investment. In general, CISA recommends two courses of action in the face of potential threat from Iranian actors: 1) vulnerability mitigation and 2) incident preparation.
- Disable all unnecessary ports and protocols. Review network security device logs and determine whether to shut off unnecessary ports and protocols. Monitor common ports and protocols for command and control activity.
- Enhance monitoring of network and email traffic. Review network signatures and indicators for focused operations activities, monitor for new phishing themes and adjust email rules accordingly, and follow best practices of restricting attachments via email or other mechanisms.
- Patch externally facing equipment. Focus on patching critical and high vulnerabilities that allow for remote code execution or denial of service on externally facing equipment.
- Log and limit usage of PowerShell. Limit the usage of PowerShell to only users and accounts that need it, enable code signing of PowerShell scripts, and enable logging of all PowerShell commands.
- Ensure backups are up to date and stored in an easily retrievable location that is air-gapped from the organizational network.
Patterns of Publicly Known Iranian Advanced Persistent Threats
BNS livestreams the Tech Solutions in Education conducted on Dec. 26, 2019
Tech solutions in Education: From the classroom to the policy board
Speaker: Joseph S. Tabadero, Jr.
Part 1 https://www.facebook.com/MBTechNews/videos/372543856944149/
Part 2 https://www.facebook.com/MBTechNews/videos/592489901564432/
Part 3 https://www.facebook.com/MBTechNews/videos/454463468555131/
Part 4 https://www.facebook.com/MBTechNews/videos/416111995789891/
Part 5 https://www.facebook.com/MBTechNews/videos/2531601520451375/
Mr. Joseph Tabadero will be in Dagupan on Dec 26th (Thursday).
He will conduct a special session on using ShinyApp.
Limited to 15 seats only.
Venue: Module 2 Bonuan Office. We will be live streaming this over Manila Bulletin’s TechNews onlineEvent Page is now up: https://www.facebook.com/events/2443350725919752/