Top Tweets for #PrivExchange
Au menu du Tech Talk #15 :
- ADFS : fonctionnement et bonnes pratiques de sécurité
- Cours de danse samba pour les néophytes : Retex sur les différents scénarios d'exploitation de smb (#impacket, #privexchange, #CrackMapExec)
Plus d'infos 👉https://t.co/6h3nPjlDwr
The @MSFTExchange team finally reduced rights granted to Exchange's default Shared Permissions Model, along with a change to EWS to fix @_dirkjan 's #PrivExchange findings.
https://t.co/AG0CblRmoU
Note: Exchange 2010 (EOL January 14th 2020) requires manual changes to AD to fix!
Microsoft released patches for #PrivExchange today!
1) Latest version won't authenticate when sending push notifications
2) Exchange privileges in AD are reduced (!), removing DACL control over the domain root object (+ others). This requires manual rerun of setup.exe /prepareAD
If you're using the ACL attack in ntlmrelayx (for example with #PrivExchange), it now saves a restore file that you can feed to aclpwn which can restore the original permissions on the domain object. This and some fixes now in the latest impacket version on GitHub!
#Microsoft er på banen med konkrete anbefalinger til at afbøde en kritiske "Elevation of Privilege (#EOP)"-sårbarhed, døbt #PrivExchange, der hvis udnyttes, gør det muligt for en almindelig bruger at opnå domæneadministrator-rettigheder i et Exchange-miljø https://t.co/szKkauHmD0
Here's an interim fix for the #PrivExchange zero-day from our Exchange expert
https://t.co/Kgkmqr7t0w
1/4 #PrivExchange by @_dirkjan perfectly illustrates how legacy permissions degrade an Active Directory environment's security posture. I want to share three free resources that will help you proactively protect your organization.
@den_n1s @_dirkjan @G0ldenGunSec thanks dude - this makes exploitation of #PrivExchange on locked down endpoints so much easier 👍
A C# implementation of @_dirkjan's #PrivExchange. Kudos to @G0ldenGunSec as I relied on his code (https://t.co/Rd5w1HwyzO)
https://t.co/HuJl1nkTXs
For those looking into building/testing detection for #PrivExchange, but don't have a lab available, here are a pcap https://t.co/0z2ibjeUBA and event log export https://t.co/htxfroAQuK
If you haven’t used #bloodhound on your domain, you REALLY should. Here’s a great step by step for #PrivExchange but be prepared for a lot of 🤔 and 😖 as you use it to map out your AD.
1/n - Here's how #BloodHound can help you determine whether you are vulnerable to PrivExchange by @_dirkjan:
Find the domain head object in the BloodHound GUI, click the number next to "First Degree Controllers". See whether an Exchange security group is present:
Microsoft Exchange vulnerable to 'PrivExchange' zero-day
https://t.co/5jnMELCNzp
#Microsoft #vulnerabilities #PrivExchange #CyberSecurity #cybercrime
0-DAY en EXCHANGE.
Un usuario con un buzón en el servidor podría escalar a administrador de dominio. A todo esto, con PoC. https://t.co/TG8Lpt17Jf
#0daytoday #EXCHANGE #PrivExchange #0day
TL;DR
A pentester silver bullet for internal #pentests: a very strong privilege escalation trick which could lead in a few seconds to a full domain compromise so we advise you to run the PoC and apply at least one of the mitigations !
https://t.co/yw4MTWUtmJ
#PrivExchange
This is good. Just tested it. Magic.
#PrivExchange
New blog! Abusing Exchange: One API call away from Domain Admin. From any user with a mailbox to Domain Admin. Probably affects the majority of orgs using AD and Exchange. https://t.co/rcW1RHJDuf
#PrivExchange : One API call to Domain Admin:
• https://t.co/Xax4IIN87v
For those who don't use EWS dynamic subscriptions, and want to block #PrivExchange from @_dirkjan
Exchange Management Shell:
New-ThrottlingPolicy -Name NoEWSSubscription -ThrottlingPolicyScope Organization -EWSMaxSubscriptions 0
Restart-WebAppPool -Name MSExchangeServicesAppPool
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