CVE-2021-39537 is a high-severity vulnerability discovered in the ncurses library, affecting versions up to v6.2-1. This vulnerability allows for a heap-based buffer overflow in the _nc_captoinfo function within captoinfo.c. The CVSS score for this vulnerability is 8.8, indicating a significant risk that warrants immediate attention from organizations using affected systems.
The potential impact of this vulnerability includes unauthorized access and manipulation of sensitive data, which can lead to broader system compromise. The exploitability of this issue is classified as high, with available attack vectors over the network, requiring user interaction to trigger the vulnerability.
Organizations should prioritize patching immediately to mitigate the associated risks. The vulnerability's presence in widely used components like ncurses highlights the need for continuous monitoring and proactive vulnerability management strategies.
Given the high severity and potential for exploitation, organizations must take swift action to update their systems and safeguard against potential attacks.
Vulnerability Details
The vulnerability is characterized as a heap-based buffer overflow, which is classified under CWE-787. It affects the ncurses library, specifically versions up to 6.2-1. The CVSS version 3.1 score is 8.8, indicating a high severity level. The publication date of this vulnerability is September 20, 2021.
Technical Analysis
The root cause of this vulnerability lies in improper memory handling within the _nc_captoinfo function. This function is responsible for processing terminal capabilities and can be exploited when handling crafted input. The attack vector is over the network, and the attack complexity is low, with no privileges required to exploit the vulnerability. However, user interaction is required, as the target must execute a program that invokes the vulnerable function.
In terms of impact, successful exploitation can lead to high confidentiality, integrity, and availability impact, potentially allowing attackers to execute arbitrary code or crash the application.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2021-39537 is notable due to the extensive use of ncurses in various applications, especially on macOS environments. Organizations that utilize this library without appropriate mitigations may expose themselves to significant risks, including unauthorized access and data breaches.
The potential blast radius of this vulnerability is large, especially in environments where ncurses is integral to application functionality. Given the CVSS score of 8.8, remediation should be treated as a high priority.
As noted in CVE intelligence, this vulnerability is not included in the KEV catalog, but organizations should treat it as a significant threat due to its exploitability and potential impact.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of ncurses up to and including 6.2-1. Specific vulnerable configurations include macOS versions 10.12.6, 11.7, and 13.0.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest patches provided by the vendors. For Apple macOS, relevant updates can be found in their security content documentation. If patches are not immediately available, alternative workarounds may include restricting access to affected applications or implementing additional security controls to limit exposure.
Monitoring for unusual behavior in applications that utilize ncurses can also help detect potential exploitation attempts. Engaging in penetration testing can further validate the effectiveness of mitigations.
Detection Guidance
Organizations should monitor logs for indicators of exploitation, such as unexpected application crashes or unusual memory usage patterns. Behavioral anomalies in applications using ncurses, especially when handling terminal capabilities, should be flagged for further investigation.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-39537 lies in its demonstration of the potential vulnerabilities in widely adopted libraries like ncurses. As organizations increasingly rely on such libraries, understanding and addressing these vulnerabilities becomes paramount.
This case emphasizes the need for robust vulnerability management programs, regular patching cycles, and proactive defensive measures to mitigate risks associated with third-party components.
Furthermore, the lessons learned from this vulnerability highlight the importance of security assessments during the development and deployment phases of applications to ensure that similar issues do not arise in the future.
For further insights on securing applications, organizations can explore more resources on penetration testing methodology and the importance of continuous security assessments.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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