Dec 06 2014
As noted in previous posts on MS14-068, including a detailed description, a Kerberos ticket with an invalid PAC checksum causes an unpatched Domain Controller to accept invalid group membership claims as valid for Active Directory resources. The MS14-068 patch modifies KDC Kerberos signature validation processing on the Domain Controller. This issue is FAR worse than …
Nov 25 2014
Microsoft has posted videos and slides from the Microsoft internal “BlueHat” security conference from October 2014. BlueHat Security Briefings educate Microsoft engineers and executives on current and emerging security threats as part of continuing efforts to help protect our customers and secure our products, devices, and services. BlueHat serves as a great opportunity for invited …
Nov 22 2014
NOTE: While this page will remain, the majority of the Mimikatz information in this page is now in the “Unofficial Mimikatz Guide & Command Reference” which will be updated on a regular basis. Mimikatz is the latest, and one of the best, tool to gather credential data from Windows systems. In fact I consider Mimikatz …
Nov 21 2014
MS14-068 References: AD Kerberos Privilege Elevation Vulnerability: The Issue Detailed Explanation of MS14-068 MS14-068 Exploit POC with the Python Kerberos Exploitation Kit (aka PyKEK) Exploiting MS14-068 Vulnerable Domain Controllers Successfully with the Python Kerberos Exploitation Kit (PyKEK) PyKEK Kerberos Packets on the Wire aka How the MS14-068 Exploit Works The folks at BeyondTrust have …
Nov 21 2014
In June 2014, Microsoft released KB2871997 which takes many of the enhanced security protection mechanisms built into Windows 8.1 & Windows Server 2012 R2 and “back-ports” them to Windows 7, Windows 8, Windows Server 2008R2, and Windows Server 2012. The enhanced security features reduce the credential data stored in memory and supports modern authentication (Kerberos …
Nov 19 2014
Thanks to Gavin Millard (@gmillard on Twitter), we have a graphic that covers the issue quite nicely (wish I had of thought of it!) Exploit Code is now on the net! As of December 4th, 2014, there is Proof of Concept (POC) code posted that exploits MS14-068 by Sylvain Monné by using Python to interact with …
Nov 18 2014
Active Directory leverages the Kerberos protocol for authentication. The vulnerability patches an issue with how the Domain Controller validates group membership in Kerberos tickets (hint: the ticket is always validated by the DC if the checksum is set to certain values). Microsoft KB3011780 patches this issue. According to Microsoft: “When this security bulletin was issued, …
Nov 15 2014
PowerShell provides an easy method to bypass antivirus and other protection methods: Up until several months ago, I was a member of a penetration test team tasked with compromising data centers and evading detection. Industry standard tools such as Metasploit (an attack toolkit that includes a backdoor named Meterpreter) and Mimikatz (a password dumper) …
Nov 13 2014
This week, Microsoft released version 5.1 of their Enhanced Mitigation Experience Toolkit (EMET). EMET 5.1 can be download from the Microsoft EMET website. Microsoft Security Research and Defense Blog describes the update: Today, we’re releasing the Enhanced Mitigation Experience Toolkit (EMET) 5.1 which will continue to improve your security posture by providing increased application compatibility …
Nov 12 2014
Earlier this year, Unix/Linux/*nix systems dealt with the “Hearbleed” OpenSSL vulnerability which affected a large portion of the web. There is a major vulnerability in Microsoft’s Schannel which was recently patched in MS14-066 (KB2992611). What is SChannel? The Secure Channel (Schannel) security package is a Security Support Provider (SSP) that implements the Secure Sockets Layer …
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