13 Dec / 2021
CVSS Score: 10 (Critical)
What Is Vulnerable?: Apache Log4j Version 2.15-rc1 or prior. (All version prior to 2.15-rc1 are vulnerable)
UPDATE 15/12: Latest 2.16 Patch fully disables JNDI and removes support for Message Lookups – https://logging.apache.org/log4j/2.x/download.html
A few nights ago, Alibaba’s Security team found a zero-day remote code execution vulnerability within Apache’s Log4j. Log4j is so ubiquitous even Apple and Amazon use it with their software stack. New Zealand’s CERT team warned journalists that they have seen this vulnerability exploited in the wild and there are proof of concepts available to threat actors. Log4J earned the infamous CVSS score of 10 from the National Vulnerability Database.
A favourite amongst Java developers, Log4j is an easy way to log for error checking within any environment it can be deployed in. Log4j has an extra couple of steps before logs get written to disk. It analyses incoming logs and checks for a $ character. If this $ is found, the logger knows to go in and change information. There is one pattern that is vulnerable to remote code execution. $(jndl:ldap This will perform a lookup to the LDAP server and deploy the malicious code found.
What You Can Do
Rapid7 have deployed new detection rules in InsightIDR to identify Log4j vulnerability potentially occurring:
Cythera continues to monitor all managed clients and detection capabilities we have in place will likely detect any post-exploitation activities related to this vulnerability
How to Optimise the Value of Your MDR Service: A Guide to Understanding MDR Pricing Models
MDR has long been hailed as a proactive alternative to Security Information and Event Management (SIEM) software. But, with such variety availab…Read More
Cyber Threats and the Israel-Hamas War
This threat landscape SOC Note does not cover any details of the ongoing ground war. Links to sources that contextualise the Israel-Hamas war ha…Read More
Why You Shouldn’t Be Reusing Passwords In 2020
Who out there has been guilty of reusing a password? We’re all guilty of it! Results from a recent Google survey discovered that at least 65% …Read More