The command line and some auxiliary information is written to the shared memory sections following some protocol. When the user invokes nsd.exe the basic steps followed in most cases are the following: After some reversing it became clear that they were the primary means of communication (there’s also named pipes involved) between the user process and the SYSTEM process.
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I opened nsd.exe up with Ida Pro and looked at how these sections were used. Quite a bit of reversing was involved in writing the following code, and as some time has elapsed between submitting the vulnerability to IBM and the fix being provided, I have tried my utmost to recall the process.Īfter looking at IBM Notes Diagnostics from the outside, using only Procmon and the command line to learn what I needed, I decided to take a closer look at the communication between the user process and the SYSTEM process.įrom Process Explorer I could see that the SYSTEM process had handles open on some sections without any permissions set. This post references information available in my previous post on IBM Notes Diagnostics. Security Bulletin: IBM Notes Privilege Escalation in IBM Notes Diagnostics service Security Bulletin: IBM Client Application Privilege Escalation in IBM Notes Diagnostics service Concrete exploitation steps and code is listed at the bottom.
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In this blog post I will tend to be a bit verbose and give some insights into the process. This process is aligned with the Improsec Responsible Disclosure Policy.
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Vulnerabilities will be published, when the vendor has provided fixes, or our deadline for the vendor to take action expires. This is the second blog post in a series documenting various bugs found in installed software during customer engagements.