CSS-Exchange
Cyber-Defence
CSS-Exchange | Cyber-Defence | |
---|---|---|
98 | 6 | |
1,195 | 471 | |
0.3% | 0.0% | |
0.0 | 1.8 | |
3 days ago | over 2 years ago | |
PowerShell | Python | |
MIT License | - |
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CSS-Exchange
- Has anyone ran the CVE-2023-23397 script against a large environment?
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CVE-2023-23397
The MaxServicePointIdleTime property I changed because of what I saw suggested here: https://github.com/microsoft/CSS-Exchange/issues/1581.
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CVE-2023-23397 - Critical Elevation of Privilege zero-day in Microsoft Outlook, severity 9.8
This is actively exploited, patch immediately. Microsoft also provided a script that checks Exchange items for malicious messaging items: https://github.com/microsoft/CSS-Exchange/blob/a4c096e8b6e6eddeba2f42910f165681ed64adf7/docs/Security/CVE-2023-23397.md
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// SITUATIONAL AWARENESS // Hunting Microsoft Word NTLM Relay Vulnerability CVE-2023-23397
Microsoft has released a PowerShell script that can be run on Exchange infrastructure to scan email files for malicious UNC paths, however, patching is the preferred mitigation strategy.
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Exchange 0day exploit in wild
I would expect that installing the URL Rewrite 2 module shouldn't cause any problems -- E2013 as such doesn't care about it. In fact, Microsoft's own EOMT script for the Hafnium mitigations suggests installing it. It'll likely require a reboot, though, or at the very least an IIS restart.
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Health checker reports unsigned IIS modules (Exchange 2013 CU23)
Yep, the August security update and OS updates were installed on all four nodes. But the order in which they were installed may have been different... I don't recall. Someone just posted above that this is a known problem with Windows 2012/R2: https://github.com/microsoft/CSS-Exchange/pull/1166
- Critical privileged elevation patch incoming next week.
- Exchange Admin?
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May 2022 Security Update - detection
Which is the latest I can find on Github. This server is running Exchange 2019 CU 11. It has the March updates (KB5012698), but not the May one (KB5014261). You can also verify from the build number it's not up to date. There are no vulnerabilities reported and the only thing in "red" is that TCP keepalive warning.
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Exchange 2019 still requires obsolete UCM4 installation
https://github.com/microsoft/CSS-Exchange/issues/535 Even the maintainer David Paulson of the ExchangeHealtcheck script opened an issue on this matter, only waiting on feedback of the Exchange Team.
Cyber-Defence
- Microsoft Exchange file lists and hashes and modified / added file checking tool
- Complete file lists and hash sets for Microsoft Exchange 2013 CU23, 2016 CU19 and 2019 RTM to CU8 to help with discovery of modified or unexpected files post compromise
- At Least 30,000 U.S. Organizations Newly Hacked Via Holes in Microsoft’s Email Software
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At Least 30k U.S. Organizations Newly Hacked via Holes in MS’s Email Software
Unfortunately a few comments here have honed in on one contrived example of why I think this strategy is broken. To give another contrived example: I personally had a logon to this portal, but it broke last year when they integrated logons with Azure and it took me like three months to get it fixed.
The fact a critical security update can't just be downloaded is bad. I don't care if someone in sales thinks every licensed user should probably be able to get it. Here NCC produced a list of "valid" files to help people scan for not legit files. Except they don't have Exchange 2019 CU 8 because they couldn't get it:
https://github.com/nccgroup/Cyber-Defence/tree/master/Intell...
Microsoft has a hard limit (5?) on the number of individual accounts you can grant access and in a big enough org it's still plausible they'll be scattered across the world and you'll find none of them available the exact hour you need this update.
What are some alternatives?
HealthChecker - Exchange Server Performance Health Checker Script
exchange_webshell_detection - Detect webshells dropped on Microsoft Exchange servers exploited through "proxylogon" group of vulnerabilites (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27065)
New-KrbtgtKeys.ps1 - This script will enable you to reset the krbtgt account password and related keys while minimizing the likelihood of Kerberos authentication issues being caused by the operation.
GadgetToJScript - A tool for generating .NET serialized gadgets that can trigger .NET assembly load/execution when deserialized using BinaryFormatter from JS/VBS/VBA based scripts.
Metasploit - Metasploit Framework
badExchangePews
scanning
IISBackdoorDetect - Detects IIS modules such as IIS-RAID
postfix - Postfix MTA by Wietse Venema