Defending against Denial of Service (DoS) Attacks

What is a DoS Attack?

According to NIST, a denial of service (DoS) is:

“The prevention of authorized access to resources or the delaying of time-critical operations. (Time-critical may be milliseconds or it may be hours, depending upon the service provided).”

denial of service (DoS) – Glossary | CSRC (nist.gov)

a distributed denial of service (DDoS) is:

“A denial of service technique that uses numerous hosts to perform the attack.”

distributed denial of service (DDoS) – Glossary | CSRC (nist.gov)

Guides

Useful Security News Sites and Blogs

The Latest News

If you want to keep up with the world of cyber security the fastest place is twitter, however that’s not the only place and whilst tweetdeck and twitter itself are incredible useful, you also are going to want to check out other areas. Inspired by a friend’s tool I thought I’d just knock up a list of sites that have useful cyber security information on:

Education

Passive Port Scanners & Internet Asset Discovery Platforms

Useful for a range of defensive and offensive purposes, internet asset search platforms enable a range of activities from:

Research & Trend Analysis
Vulnerability Hunting
Attack Surface Mapping
OSINT

Each has its own interfaces, features, dataset sand styles.

I’ve put together a list of the most popular, there may be more that I haven’t listed.

Threat Intel

CVE-2022-26134 – Confluence Zero Day RCE

We are seeing active exploitation in the wild: MIRAI deployment, coinminer deployments etc.

THIS DOES SHOW IN THE ACCESS LOGS! The comment about “what isn’t in the logs” is about POST request BODY not showing in them, not that nothing is logged

https://www.virustotal.com/gui/file/5d2530b809fd069f97b30a5938d471dd2145341b5793a70656aad6045445cf6d/community

XMRIG, KINSING, MIRAI etc. are being deployed by threat actors after exploiting this vulnerability.

This is a fast publish

POC is in the wild: https://www.rapid7.com/blog/post/2022/06/02/active-exploitation-of-confluence-cve-2022-26134/

https://github.com/jbaines-r7/through_the_wire

keep checking vendor guidance and keep checking this for updates… use at own risk etc.

Workaround/Hotfixes have been published by Atlassian:

https://confluence.atlassian.com/doc/confluence-security-advisory-2022-06-02-1130377146.html

https://jira.atlassian.com/browse/CONFSERVER-79000

GreyNoise Tag is online: GreyNoise Trends

Also check this out for scanners: GreyNoise

Nice work https://twitter.com/_mattata and all the other people in the cyber community that are working on this!

IT MAY BE WISE TO ASSUME BREACH

The vulnerability appears to be in: xwork-1.0.3-atlassian-10.jar

Background

Velocity discovers a zero-day in confluence 03/06/2022 (GMT)

.@Volexity discovers zero-day exploit impacting all current versions of Atlassian Confluence Server and Data Center. Attackers deploy in-memory Java implant to evade detection. Read more in our latest blog post: https://t.co/aCSwnSUfj8 #DFIR #ThreatIntel #InfoSec
— Volexity (@Volexity) June 2, 2022

Guides

Cyber Essentials Readiness

So, you have a driver to achieve cyber essentials, great stuff. Now if you are a business of reasonable size and scale this activity requires a bit of planning, context and lots of access and data. This could be via a distributed team or via a dedicated project team. In this post I’m going to look at what you may need to conduct the planning, discovery, assessment, and certification for Cyber Essentials and/or CE+.

Defence

Office Microsoft Support Diagnostic Tool (MSDT) Vulnerability “Follina”

This is a fast publish!

Confirmed all Office (ISO Install/PRO and 365) when using the Rich Text Format (RTF) method.

Office 365 has some sort of patch against the .DOCX format.

oh dear….
Windows 11 (not 100% up to date from APRIL)
Office 365 (should be fully patched)

.RTF

MSDT Exploit! pic.twitter.com/M2Xn1TxANX
— MrR3b00t | #StandWithUkraine #DefendAsOne (@UK_Daniel_Card) May 31, 2022

WGET Execution

Guides

Wireguard Client for Linux on KALI

So as always there are a million things in tech and well it’s rare that someone knows EVERYTHING. I must connect to a Wireguard VPN from a KALI VM. Should be simple, well actually it was a bit more complicated as I had two errors along the way!

Leadership

Cyber Leadership

Myth: you must be a “techie” to lead in the CYBERS

Ok so you might be sitting here going… but Dan you send pews and do “techy” stuff… do you not lead? Well, I mean I do all kinds of things, I write business cases, I play with spreadsheets (fun right!), I integrate systems and look at data and sometimes write really bad code! (hey, the pews aren’t going to send themselves!) but… I want to talk about some realities here.

Defence

CVE-2022-22972 & CVE-2022-22973

More VMware Workspace One Vulns

This is a fast publish

Vmware just released patches for two new vulnerabilities in Workspace One, followed by guidance from CISA to patch by May 23^rd or remove the devices from the network/internet!

“All Federal Civilian Executive Branch agencies must complete the following actions:

By 5:00 PM EDT on Monday, May 23, 2022:

Enumerate all instances of impacted VMware products [VMware Workspace ONE Access (Access), VMware Identity Manager (vIDM), VMware vRealize Automation (vRA), VMware Cloud Foundation, and vRealize Suite Lifecycle Manager] on agency networks.

Education

The CYBER GANG Cookbook

Volume 1

Introduction

I am sitting here, and I need another cup of tea, but I thought I’d start to have a think about what common “CYBER GANGS” look like. This isn’t criminal or non-criminal. But you know there’s some commonality between both. I thought this was fun little thinking exercise to show the duality of life, what digital worlds look like but also to give a glimpse into the mysteryious (its not!) world of cyberz (including crime!)