Hot Patches for Log4Shell Introduced Multiple Vulnerabilities in Amazon Web Services
Amazon Web Services has addressed vulnerabilities introduced by the hot patches released in response to the Log4Shell vulnerability in December.
Background
On April 19, researchers with Palo Alto’s Unit 42 disclosed four vulnerabilities introduced by the hot patches for Amazon Web Services (AWS) in response to CVE-2021-44228, also known as Log4Shell. While there are four CVEs, CVE-2022-0070 and CVE-2022-0071 were assigned to address incomplete patches for CVE-2021-3100 and CVE-2021-3101 respectively, which were initially disclosed in December 2021.
| CVE | Description | CVSSv3 |
|---|---|---|
| CVE-2021-3100 | Apache Log4j Hot Patch Service Execution with Unnecessary Privileges Vulnerability | 8.8 |
| CVE-2021-3101 | Hotdog Hot Patch Solution Execution with Unnecessary Privileges Vulnerability | 8.8 |
| CVE-2022-0070 | Apache Log4j Hotpatch Service Execution with Unnecessary Privileges Vulnerability | 8.8 |
| CVE-2022-0071 | Hotdog Hot Patch Solution Execution with Unnecessary Privileges Vulnerability (Incomplete Fix) | 8.8 |
Analysis
On December 12, in response to the Log4Shell vulnerability, AWS released open source hot patches — short term solutions to be implemented at scale until a more robust fixed version can be deployed — for several environments. These hot patches detect vulnerable Java applications and patch them “on the fly.”
According to the researchers at Unit 42, the hot patch solutions developed to address Log4Shell for standalone servers, Kubernetes clusters, Elastic Container Service (ECS) clusters and Fargate contained “severe security issues.” These hot patches, though from AWS, can be applied to other cloud and on-prem environments.
These issues can be exploited by “every container in [the hot patched] environment” to achieve container escape and host takeover. The vulnerabilities also allow unprivileged processes to escalate privileges and gain code execution with root privileges. The vulnerabilities are not configuration-dependent, they can be exploited in most AWS environments.
Solution
The following is a summary of the solutions for the hot patches:
| Solution | Fixed Version | Release |
|---|---|---|
| Amazon Linux (AMI) | 1.1-16 | log4j-cve-2021-44228-hotpatch |
| Kubernetes | 1.1-16 | kubernetes-log4j-cve-2021-44228-node-agent Daemonset |
| Bottlerocket | 1.02 | hotdog-v1.0.2 |
Identifying affected systems
A list of Tenable plugins to identify these vulnerabilities can be found here.
Tenable.cs users can detect vulnerable Kubernetes deployments via the kubernetes-log4j-cve-2021-44228-node-agent hot patch daemonset using open policy agent rego. The rego checks the image version, if it is "v0.0.12-debian" then it finds the corresponding configmap to check the actual package version that the daemonset job will install in the cluster. If Tenable.cs does not detect the fixed version (1.1-16), the product will display an alert.
Get more information
- AWS Security Page for CVE-2021-3100, CVE-2021-3101, CVE-2022-0070 and CVE-2022-0071
- Palo Alto’s Unit 42 Blog Post
Join Tenable's Security Response Team on the Tenable Community.
Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface.
Get a free 30-day trial of Tenable.io Vulnerability Management.
Related Articles
Cybersecurity Snapshot: CISA Hands Down Cloud Security Directive, While Threat from North Korean IT Workers Gets the Spotlight
December 20, 2024Check out the new cloud security requirements for federal agencies. Plus, beware of North Korean government operatives posing as remote IT pros. Also, learn how water plants can protect their HMIs against cyberattacks. And get the latest on the U.S. cyber incident response framework; the CIS Benchmarks; and local and state governments’ cyber challenges.
Web App Scanning 101: What Security Pros Need to Know About CI/CD Pipelines
December 19, 2024Git, repositories and pipelines…oh my! We unpack standard practices in the web app development process and provide guidance on how to use Tenable Web Application Scanning to secure your code.
Cybersecurity Snapshot: Telecoms May Face Tougher Regulations After Salt Typhoon Hacks, as Study Finds Cyber Pros More Stressed at Work
December 13, 2024The FCC wants stronger cyber regulations for telecoms after cyber espionage breaches. Meanwhile, find out why cyber pros say work has become more difficult. Plus, check out tips to prevent AI-boosted financial fraud. And get the latest on vulnerability management, EU cyber challenges and CIS predictions for 2025.