In September, security researchers discovered the existence of CVE-2019-16928, a vulnerability involving the mail transfer agent Exim. Exim accounts for over 50% of publicly reachable mail servers on the internet. What makes the bug particularly noteworthy is that threat actors could exploit it to perform denial of service (DoS) or possibly even remote code execution attacks (RCE) — making it a serious concern for Exim customers who use vulnerable versions of the software.
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We discovered a Docker Hub repository that has been sending infected cryptocurrency-mining containers to hubs with publicly exposed APIs. Some of the images within the repository contained a Shodan script that identified potential targets for further distribution.
Read More Through data analysis of the container honeypots we’ve set up to monitor threats, we’ve uncovered notable activities of undesired or unauthorized cryptocurrency miners being deployed as rogue containers using a community-contributed container image published on Docker Hub. The image is being abused as part of a malicious service that delivers cryptocurrency-mining malware. Networking tools are retrieved to carry out lateral movement on other exposed containers and applications.
The activities we uncovered are also significant in that they don’t need to exploit vulnerabilities and don’t depend on any version of Docker. Identifying a misconfigured and thus exposed container image is all it could take for attackers to infect many exposed hosts.
Read More We recently observed cases of abuse of the systems running misconfigured Docker engine with Docker application program interface (API) ports exposed. We also noticed that the malicious activities were focused on scanning for open ports 2375/TCP and 2376/TCP, which are used by the Docker engine daemon (dockerd). The intrusion attempts to deploy a cryptocurrency-mining malware (detected by Trend Micro as Coinminer.SH.MALXMR.ATNE) on the misconfigured systems.
Docker implements virtualization on the operating-system (OS) level — also known as containerization. The Docker APIs, in particular, allow remote users to control Docker images like a local Docker client does. Opening the API port for external access is not recommended, as it can allow hackers to abuse this misconfiguration for malicious activities.
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