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Defence

Offensive KEV Alpha 0.1

Working out what exploits to care about is a tough job, kill chains, availability of exploits, complexity, data flows, controls etc. all play a part in understanding a vulnerability and how it affects your organisational risk. To support this effort I’ve started to compile a list of public exploits against CISA Known Exploited Vulnerabilities (KEV). This may be useful for defensive and offensive security pros.

Read more “Offensive KEV Alpha 0.1” →
Hacking

Linux Privilege Escalation

When you gain access to a target node you will want to explore, the exact method you use to do this will depend upon operational security considerations, time constraints and style. You will be looking for a range of elements to support progressing an objective.

It should be noted that the objective may NOT require elevation. You may be trying to obtain data and access might already be possible using the context you have assumed.

You also may need to move from a www-data user to a named user account or get to root level of access. If so there’s a range of questions we should be asking ourselves:

Read more “Linux Privilege Escalation” →
Defence

Offensive KEV Updates! CISA releases 38 more CVEs to…

Life in the vulnerability and exploit space is never dull

Spotted on twitter (thanks Danny!):

already ahead of u 😉 you know that all the infosec pros have to read every one…. well ones relvent to their environment/scope…. 😛 x pic.twitter.com/AnMqiLjNvB

— MrR3b00t | #StandWithUkraine #DefendAsOne (@UK_Daniel_Card) June 9, 2022

https://www.zdnet.com/article/cisa-warning-hackers-are-exploiting-these-36-significant-cybersecurity-vulnerabilities-so-patch-now/

CISA updates the known exploited vulnerabilities list (KEV) yesterday with another 38 updates!

That means an update is required for OFFESNIVE KEV!

Read more “Offensive KEV Updates! CISA releases 38 more CVEs to KEV” →
Threat Intel

Learn to SOC: Java Webshell via confluence

When running honeypots you never have to wait too long for something to drop!

This moring we had a new hit in the pot, so I decided to invesigate but also to blog and show how we could go about investigating the logs and paylods etc.

Read more “Learn to SOC: Java Webshell via confluence” →
Education

PWNDEFND: Known Exploitable Vulnerabilities (KEV) – AKA: Offensive KEV

There’s thousand of vulnerabilities, but do you ever struggle work out what ones might actually be useful to you if you are defending or attacking?

Well don’t worry I’ve started to document some things that might help you both attack and defend in CYBERSPACE!

Read more “PWNDEFND: Known Exploitable Vulnerabilities (KEV) – AKA: Offensive KEV” →
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
Read more “CVE-2022-26134 – Confluence Zero Day RCE” →
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

Read more “Office Microsoft Support Diagnostic Tool (MSDT) Vulnerability “Follina”” →
A screenshot of a computer Description automatically generated with medium confidence Threat Intel

CVE-2021-38647 – Open Management Infrastructure (OMI) RCE – Linux…

Situation

Ok so the situation is as per usual a bit fluid, when this first dropped I was looking at this with a “azure” lense, however as time goes on it appears this likely also covers any Linux distro with the Azure/SCOM/OMS agents installed. This may change the profile of risk considerable, not only from a public facing attack surafce but highly likely from a lateral movement persspective. I’m going to keep updating this as more intel comes in. (sorry I’d be clearer if I had a clearer picture myself)

This week 4 vulnerabilities were disclosed which affect Azure virtual machines running the Open Management Infrastructure (OMI) agent (think PowerShell remoting). As above the scope seems to be slightly wider with regard to SCOM/AZURE and OMS/Sentinel etc. agents for Linux (I want to confirm all of this but for now it seems this is the position)

Essentially these vulnerabilities allow for both network-based remove code execution (RCE) and local privilege escalation (LPE).

  • There is evidence of exploitation in honeypots.
  • There is a public proof of concept available for the RCE.
  • The internet facing attack surface from a global perspective seems low based on the data in Shodan and Censys however I’m not convinced this is currently giving a clear picture.
    • So, check your azure networks, Vms and firewalls would be a sensible idea

Read more “CVE-2021-38647 – Open Management Infrastructure (OMI) RCE – Linux hosts” →

Defense

ProxyLogon (CVE-2021-26855) PoC and Metasploit Module Released

The last two weeks we’ve seen major activity around the world with defenders and criminals rushing to respond to the recent zero day vulnerability patches and then the race to reverse engineer the kill chain to create an explot. We saw a PoC fairly early but it required that you reverse engineer some exchange DLLs and/or TAP the 443 to 444 interface on an exchange server to work out how to weaponise it. Things however have progressed, 8 hours ago we saw a metasploit module go online:

Read more “ProxyLogon (CVE-2021-26855) PoC and Metasploit Module Released” →

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