CVE-2021-22940 Overview
CVE-2021-22940 is a use after free vulnerability affecting Node.js versions before 16.6.1, 14.17.5, and 12.22.5. This memory corruption flaw allows an attacker to potentially exploit freed memory to change process behavior, leading to integrity compromise of affected systems. The vulnerability is network-exploitable and requires no privileges or user interaction, making it particularly dangerous in server-side Node.js deployments.
Critical Impact
Attackers can exploit memory corruption to modify process behavior in Node.js applications, potentially leading to integrity violations and unauthorized process manipulation.
Affected Products
- Node.js versions before 16.6.1, 14.17.5, and 12.22.5
- Oracle GraalVM Enterprise Edition 20.3.3 and 21.2.0
- Oracle JD Edwards EnterpriseOne Tools
- Oracle PeopleSoft Enterprise PeopleTools 8.57, 8.58, and 8.59
- NetApp NextGen API
- Siemens SINEC Infrastructure Network Services
- Debian Linux 10.0
Discovery Timeline
- August 16, 2021 - CVE-2021-22940 published to NVD
- November 21, 2024 - Last updated in NVD database
Technical Details for CVE-2021-22940
Vulnerability Analysis
This vulnerability is classified as CWE-416 (Use After Free), a memory corruption issue where an application continues to use a pointer after the memory it references has been freed. In the context of Node.js, this flaw enables attackers to manipulate process behavior by exploiting the memory corruption condition.
The vulnerability is network-accessible and can be exploited without authentication or user interaction. While the confidentiality and availability of the system remain unaffected, the integrity of the process can be compromised, allowing attackers to potentially alter application behavior or data processing.
Root Cause
The root cause stems from improper memory management within Node.js where memory is deallocated but references to that memory continue to be used. This use after free condition occurs when the application fails to properly track memory lifecycle, leaving dangling pointers that can be exploited. When the freed memory is reallocated for other purposes and the old pointer is dereferenced, memory corruption can occur.
Attack Vector
The attack vector for CVE-2021-22940 is network-based, allowing remote exploitation. An attacker can send specially crafted requests or data to a vulnerable Node.js application to trigger the use after free condition. The exploitation does not require any privileges or authentication, and no user interaction is needed to successfully exploit this vulnerability.
The attack flow involves:
- Triggering a code path that causes memory to be freed
- Allocating new memory that occupies the same address space
- Causing the application to use the stale pointer, referencing the attacker-controlled data
- Manipulating the process behavior through the corrupted memory state
For detailed technical information on the vulnerability mechanics, refer to the HackerOne Report #1238162 and the Node.js Vulnerability Blog Post.
Detection Methods for CVE-2021-22940
Indicators of Compromise
- Unexpected process behavior or crashes in Node.js applications
- Memory access violations or segmentation faults in application logs
- Anomalous network traffic patterns targeting Node.js services
- Evidence of memory corruption in application core dumps
Detection Strategies
- Monitor Node.js application logs for memory-related errors, crashes, or abnormal terminations
- Deploy runtime application self-protection (RASP) solutions to detect memory corruption attempts
- Implement network intrusion detection rules for suspicious traffic patterns targeting Node.js endpoints
- Use SentinelOne Singularity to detect exploitation attempts through behavioral analysis
Monitoring Recommendations
- Enable verbose logging for Node.js applications to capture memory-related warnings
- Configure alerting for unexpected application restarts or crashes
- Monitor system memory usage patterns for anomalies indicating exploitation attempts
- Track and inventory all Node.js versions deployed across the environment
How to Mitigate CVE-2021-22940
Immediate Actions Required
- Upgrade Node.js to version 16.6.1 or later, 14.17.5 or later, or 12.22.5 or later immediately
- Review and update Oracle GraalVM, JD Edwards EnterpriseOne Tools, and PeopleSoft Enterprise PeopleTools to patched versions
- Apply Siemens security patches as outlined in Siemens Security Advisory SSA-389290
- Conduct a comprehensive inventory of all Node.js deployments to identify vulnerable instances
Patch Information
Security patches are available from Node.js and affected vendors. Organizations should apply the following updates:
- Node.js: Upgrade to versions 16.6.1, 14.17.5, or 12.22.5 or later. Refer to the Node.js Vulnerability Blog Post for details.
- Oracle Products: Apply patches from Oracle CPU October 2021, Oracle CPU January 2022, and Oracle CPU July 2022.
- Siemens Products: Apply updates per Siemens Security Advisory SSA-389290.
- Debian Linux: Apply updates per the Debian LTS Announcement October 2022.
- NetApp Products: Refer to NetApp Security Advisory NTAP-20210923-0001.
Workarounds
- Implement network segmentation to limit exposure of Node.js applications to untrusted networks
- Deploy Web Application Firewalls (WAF) to filter potentially malicious requests
- Consider containerization with memory isolation to limit impact of exploitation
- Implement rate limiting and input validation at the application layer
# Verify Node.js version and upgrade if vulnerable
node --version
# If version is below 16.6.1, 14.17.5, or 12.22.5, upgrade immediately
# Using nvm (Node Version Manager)
nvm install 16.6.1
nvm use 16.6.1
# Or using package manager
apt-get update && apt-get install nodejs=16.6.1
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
