SMBleedingGhost Writeup Part II: Unauthenticated Memory Read – Preparing the Ground for an RCE

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https://blog.zecops.com/vulnerabilities/smbleedingghost-writeup-part-ii-unauthenticated-memory-read-preparing-the-ground-for-an-rce/

In our previous blog post, we demonstrated how the SMBGhost bug (CVE-2020-0796) can be exploited for local privilege escalation. A brief reminder: CVE-2020-0796, also known as “SMBGhost”, is a bug in the compression mechanism of SMBv3.1.1. The bug affects Windows 10 versions 1903 and 1909, and it was announced and patched by Microsoft about 3 months ago. In the previous blog post we mentioned that although the Microsoft Security Advisory describes the bug as a Remote Code Execution (RCE) vulnerability, there is no public POC that demonstrates RCE through this bug. This was true until chompie1337 released the first public RCE POC, based on the writeup of Ricerca Security. Our POC uses a different method, and doesn’t involve physical memory access. Instead, we use the SMBleed (CVE-2020-1206) bug to help with the exploitation.

SMBleedingGhost Writeup Part II: Unauthenticated Memory Read - Preparing the Ground for an RCE - ZecOps Blog

Introduction In our previous blog post, we demonstrated how the SMBGhost bug (CVE-2020-0796) can be exploited for local privilege escalation. A brief reminder: CVE-2020-0796, also known as “SMBGhost”, is a bug in the compression mechanism of SMBv3.1.1. The bug affects Windows 10 versions 1903...

blog.zecops.com

SMBleedingGhost Writeup: Chaining SMBleed (CVE-2020-1206) with SMBGhost - ZecOps Blog

TL;DR While looking at the vulnerable function of SMBGhost, we discovered another vulnerability: SMBleed (CVE-2020-1206). SMBleed allows to leak kernel memory remotely. Combined with SMBGhost, which was patched three months ago, SMBleed allows to achieve pre-auth Remote Code Execution (RCE). POC...

blog.zecops.com