Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Comments
Access Control Lists: 6 Key Principles to Keep in Mind
Threaded  |  Newest First  |  Oldest First
paul.dittrich
50%
50%
paul.dittrich,
User Rank: Strategist
1/30/2019 | 3:40:31 PM
Harnessing the power of ACLs
I could not agree more strongly with every point in your column.

It may be fashionable to claim there is no longer a network perimeter but I still strongly favor using the border router as a "garbage filter".

The BOGONs list? - Drop them all.  Invalid TCP flag combinations - Drop.  No Telnet in your environment?  No FTP?  No RDP?  - Block them all at the border router.

As mentioned in the post, the NGFW should take care of the deep packet inspection for only the traffic you potentially want inside your network.  That firewall should see very little traffic except for the known IPs, ports and protocols which are candidates to be allowed all the way in.

And an outbound ACL (a.k.a. egress filtering) is a very powerful weapon against data exfiltration and many types of malware.  You may still have a Trojan but if it can't phone home......


US Turning Up the Heat on North Korea's Cyber Threat Operations
Jai Vijayan, Contributing Writer,  9/16/2019
Preventing PTSD and Burnout for Cybersecurity Professionals
Craig Hinkley, CEO, WhiteHat Security,  9/16/2019
NetCAT Vulnerability Is Out of the Bag
Dark Reading Staff 9/12/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
7 Threats & Disruptive Forces Changing the Face of Cybersecurity
This Dark Reading Tech Digest gives an in-depth look at the biggest emerging threats and disruptive forces that are changing the face of cybersecurity today.
Flash Poll
The State of IT Operations and Cybersecurity Operations
The State of IT Operations and Cybersecurity Operations
Your enterprise's cyber risk may depend upon the relationship between the IT team and the security team. Heres some insight on what's working and what isn't in the data center.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2019-13552
PUBLISHED: 2019-09-18
In WebAccess versions 8.4.1 and prior, multiple command injection vulnerabilities are caused by a lack of proper validation of user-supplied data and may allow arbitrary file deletion and remote code execution.
CVE-2019-15301
PUBLISHED: 2019-09-18
A SQL injection vulnerability in the method Terrasoft.Core.DB.Column.Const() in Terrasoft Bpm'online CRM-System SDK 7.13 allows attackers to execute arbitrary SQL commands via the value parameter.
CVE-2019-5042
PUBLISHED: 2019-09-18
An exploitable Use-After-Free vulnerability exists in the way FunctionType 0 PDF elements are processed in Aspose.PDF 19.2 for C++. A specially crafted PDF can cause a dangling heap pointer, resulting in a use-after-free. An attacker can send a malicious PDF to trigger this vulnerability.
CVE-2019-5066
PUBLISHED: 2019-09-18
An exploitable use-after-free vulnerability exists in the way LZW-compressed streams are processed in Aspose.PDF 19.2 for C++. A specially crafted PDF can cause a dangling heap pointer, resulting in a use-after-free condition. To trigger this vulnerability, a specifically crafted PDF document needs ...
CVE-2019-5067
PUBLISHED: 2019-09-18
An uninitialized memory access vulnerability exists in the way Aspose.PDF 19.2 for C++ handles invalid parent object pointers. A specially crafted PDF can cause a read and write from uninitialized memory, resulting in memory corruption and possibly arbitrary code execution. To trigger this vulnerabi...