CVE-2021-42384 is a high-severity vulnerability affecting Busybox's awk applet, classified as a use-after-free issue. This vulnerability allows attackers to exploit the system, leading to denial of service and potentially executing arbitrary code when processing specially crafted awk patterns within the handle_special function. The CVSS score for this vulnerability is 7.2, indicating a significant risk that organizations must address promptly.
The exploitation status of this vulnerability is currently not known, as there are no confirmed public exploits or proof of concepts available. However, the potential impact on affected systems is substantial, making it crucial for organizations to prioritize remediation efforts.
Organizations using Busybox, particularly those running versions from 1.18.0 to 1.33.1, should take immediate action to mitigate risks associated with this vulnerability. This includes applying patches as soon as they are available and ensuring that security measures are in place to prevent possible exploitation.
Given the potential for denial of service and code execution, the urgency for organizations to patch this vulnerability cannot be overstated. Timely remediation is essential to protect systems and sensitive data from malicious actors.
Vulnerability Details
A use-after-free in Busybox's awk applet leads to denial of service and possibly code execution when processing a crafted awk pattern in the handle_special function. The vulnerability has a CVSS score of 7.2, categorized as high severity. The affected product is Busybox, and the vulnerability was published on November 15, 2021.
Technical Analysis
The root cause of this vulnerability is a use-after-free condition that occurs in the awk applet of Busybox. This vulnerability can be exploited over the network with low complexity, requiring high privileges but no user interaction. The impacts include high confidentiality, integrity, and availability risks.
Risk & Impact Analysis
Risk to organizations includes significant denial of service and potential unauthorized code execution. The blast radius can affect all systems utilizing the vulnerable Busybox version. Organizations should assess their exposure and prioritize patching based on this high-severity vulnerability.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
This vulnerability affects Busybox versions from 1.18.0 to 1.33.1 and Fedora versions 33 and 34. Organizations should ensure they are using patched versions to avoid exposure.
Mitigation & Remediation
Organizations should prioritize patching immediately. The latest versions of Busybox should be utilized to mitigate this vulnerability. In instances where patching is not feasible, consider implementing network controls and monitoring for unusual activity to protect against potential exploits. More information on effective remediation strategies can be found in our penetration testing services that can help identify vulnerabilities.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual awk processing patterns, review behavioral anomalies in systems running Busybox, and implement network signatures that identify potential exploit traffic.
AppSecure Threat Intelligence Insight
The significance of CVE-2021-42384 lies in its potential for denial of service and code execution, highlighting the need for robust security practices in system design. Security teams should recognize the patterns of vulnerabilities that allow for such severe impacts and adopt a proactive approach to vulnerability management. For more insights, explore our articles on penetration testing methodology and vulnerability management program design to strengthen your defenses.
Additionally, understanding the trends in vulnerabilities such as this can help organizations better prepare for potential threats. For further reading, check our insights on API penetration testing and cloud penetration testing strategies.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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