0vercl0k/cve-2021-28476

PoC for CVE-2021-28476 a guest-to-host "Hyper-V Remote Code Execution Vulnerability" in vmswitch.sys.

cve-2021-28476's Issues

Diffing your vmswitch files with wrong results

Hi,

i've downloaded your vmswitch files and i diffed both, but i don't have the same results as you:

And if i search for the target function VmsIfrInfoParams_OID_SWITCH_NIC_REQUEST this has not difference

the idbs were created with ida pro 7.5 and they were diffed with bindiff 7

can you tell me if your files are correctly posted or something?

thanks in advance and sorry, i'm a noob yet

Error in loading the driver

I followed the steps but I still get errors, please let me know what you think:
https://freeimage.host/i/HCmYfXj

Thanks.

vmswitch source code missing

vmswitch's source code is missing. (There is no source code in both compressed file)
Can you re-upload the source code?

What should I do to get RCE?

Hello, I was very interested in PoC. Can you tell me how to do RCE? (Sorry for my bad english.)

poc no work for windows server 2012 r2

I inserted fragment code printk(KERN_ALERT "poc: trig vuln VmsIfrInfoParams_OID_SWITCH_NIC_REQUEST") into the rndis_filter.c (in func rndis_trigger_rndisquery before call rndis_filter_send_request()) for loggining. After execute poc,system no state dos,but dmesg output have string "poc: trig vuln VmsIfrInfoParams_OID_SWITCH_NIC_REQUEST"
I tried poc execute for different package updates:
1)
"windows server 2012 r2 installed updates":[ "KB5001382", "KB2999226", "KB2949621", "KB2939471", "KB2938772", "KB2937220", "KB2919355", "KB2919442" ]
2)
"windows server 2012 r2 installed updates":[ "KB5000848", "KB2999226", "KB2949621", "KB2939471", "KB2938772", "KB2937220", "KB2919355", "KB2919442" ]
3)
"windows server 2012 r2 installed updates":[ "KB2999226", "KB2949621", "KB2939471", "KB2938772", "KB2937220", "KB2919355", "KB2919442" ]
4)
"windows server 2012 r2 installed updates":[ "nil" ]
config guest vm hv:
"config":{ "guest hyper-v system":{ "os": ["ubuntu 20.01"] "type vm": ["2(*supported vmbus and hvcalls*)"] "network":[ "external virtual network":{ "SR-IOV":True, "Allow management operation system to share this network adapter":True } ] } }
I took the driver with vmswitch.sys from Windows 2012 r2 server, path: "/ SystemRoot / system32 / drivers / vmswitch.sys" and tried to find symbols
VmsIfrInfoParams_ * using ida. ida did not find symbols

what dependencies and nuances I did not take into account for successful execution poc?