Microsoft paid out two huge bounties for the same bug in its June patch

The same bug that earned one researcher $50,000 from Microsoft also earned another researcher $100,000.

Tencent researcher Yang Yu, the finder of the so-called BadTunnel bug that Microsoft patched last month wasn’t the only one rewarded for reporting the issue. Moritz Jodeit, a researcher with German security firm, Blue Frost Security, picked up $100,000.

BadTunnel was notable since it affected every version of Microsoft's operating system back to Windows 95. But while Yu's find had a wide impact, Jodeit used the same bug to to bypass many of the latest technologies Microsoft employs to prevent exploits from working,which could also have implications for its latest and most secure browser, Edge for Windows 10.

Jodeit has previously sketched a rough outline of the bug and confirmed he had received the highest reward available under Microsoft’s Mitigation Bypass Bounty. However, he drew attention to the bug in a tweet today since it was recently confirmed he will present his work at the Hack in the Box conference in Singapore this August.

Jodeit provides a slightly more detailed account of the vulnerability here, and highlights the numerous defences in Internet Explorer 11 he had to bypass to gain remote code execution, giving him complete control over the computer.

The researcher notes that while his exploit wasn’t for Edge, it does share common protections in Internet Explorer 11.

Some of these exploit mitigations in both Edge and Internet Explorer 11 include Address Space Layout Randomisation, Data Execution Prevention, and Control Flow Guard.

“If you managed to bypass all of these and you successfully turned your bug(s) into remote code execution, you are trapped inside a sandbox which needs to be escaped,” Jodeit notes.

He will detail how he bypassed these mitigations and discuss the exploit he created to bypass the latest version of Microsoft’s Enhanced Mitigation Experience Toolkit (EMET) 5.5.

“We'll present all the techniques which we used to write a stable exploit for IE 11 (64-bit) running on Windows 10 including an Enhanced Protected Mode (EPM) sandbox escape and a generic way to bypass the latest version of EMET 5.5 as well,” he wrote.

The researcher says he found an initial vulnerability in the JavaScript implementation of Internet Explorer 11, which he turned into a “full memory read/write primitive by exploiting IE's custom heap allocator.”

“Subsequently we'll present a technique we used to bypass Control Flow Guard (CFG) to gain initial code execution within the sandbox. We'll talk about our line of thought (and some failures) when trying to find a way to escape the EPM sandbox and finally present a purely logic-based vulnerability which successfully allowed us to escape the sandbox. Lastly we'll show a generic way which enabled us to successfully bypass the latest version EMET within our exploit.”

The researcher’s talk will be on August 26, at the Hack in the Box conference in Singapore.

Join the CSO newsletter!

Error: Please check your email address.

Tags hackersBlue Frost SecurityEMETBug bountyMicrosoftBadTunnelInternet Explorer 11bug trackingEPM

More about MicrosoftToolkit

Show Comments

Featured Whitepapers

Editor's Recommendations

Solution Centres

Stories by Liam Tung

Latest Videos

  • 150x50

    CSO Webinar: Will your data protection strategy be enough when disaster strikes?

    Speakers: - Paul O’Connor, Engagement leader - Performance Audit Group, Victorian Auditor-General’s Office (VAGO) - Nigel Phair, Managing Director, Centre for Internet Safety - Joshua Stenhouse, Technical Evangelist, Zerto - Anthony Caruana, CSO MC & Moderator

    Play Video

  • 150x50

    CSO Webinar: The Human Factor - Your people are your biggest security weakness

    ​Speakers: David Lacey, Researcher and former CISO Royal Mail David Turner - Global Risk Management Expert Mark Guntrip - Group Manager, Email Protection, Proofpoint

    Play Video

  • 150x50

    CSO Webinar: Current ransomware defences are failing – but machine learning can drive a more proactive solution

    Speakers • Ty Miller, Director, Threat Intelligence • Mark Gregory, Leader, Network Engineering Research Group, RMIT • Jeff Lanza, Retired FBI Agent (USA) • Andy Solterbeck, VP Asia Pacific, Cylance • David Braue, CSO MC/Moderator What to expect: ​Hear from industry experts on the local and global ransomware threat landscape. Explore a new approach to dealing with ransomware using machine-learning techniques and by thinking about the problem in a fundamentally different way. Apply techniques for gathering insight into ransomware behaviour and find out what elements must go into a truly effective ransomware defence. Get a first-hand look at how ransomware actually works in practice, and how machine-learning techniques can pick up on its activities long before your employees do.

    Play Video

  • 150x50

    CSO Webinar: Get real about metadata to avoid a false sense of security

    Speakers: • Anthony Caruana – CSO MC and moderator • Ian Farquhar, Worldwide Virtual Security Team Lead, Gigamon • John Lindsay, Former CTO, iiNet • Skeeve Stevens, Futurist, Future Sumo • David Vaile - Vice chair of APF, Co-Convenor of the Cyberspace Law And Policy Community, UNSW Law Faculty This webinar covers: - A 101 on metadata - what it is and how to use it - Insight into a typical attack, what happens and what we would find when looking into the metadata - How to collect metadata, use this to detect attacks and get greater insight into how you can use this to protect your organisation - Learn how much raw data and metadata to retain and how long for - Get a reality check on how you're using your metadata and if this is enough to secure your organisation

    Play Video

  • 150x50

    CSO Webinar: How banking trojans work and how you can stop them

    CSO Webinar: How banking trojans work and how you can stop them Featuring: • John Baird, Director of Global Technology Production, Deutsche Bank • Samantha Macleod, GM Cyber Security, ME Bank • Sherrod DeGrippo, Director of Emerging Threats, Proofpoint (USA)

    Play Video

More videos

Blog Posts

Market Place