CVE-2021-22945 is a critical vulnerability that affects libcurl versions 7.73.0 and 7.78.0. This vulnerability allows attackers to exploit memory management issues, specifically when sending data to an MQTT server. In certain circumstances, libcurl may erroneously keep a pointer to an already freed memory area, leading to potential misuse of that memory in subsequent calls.
With a CVSS score of 9.1, this vulnerability is classified as critical, indicating a severe risk to affected systems. The attack vector is network-based, requiring low complexity, no privileges, and no user interaction, making it easy for attackers to exploit. The potential impacts include high confidentiality and availability risks.
Given the critical nature and ease of exploitation of this vulnerability, organizations should prioritize patching immediately. Failure to address this vulnerability could lead to unauthorized access and potential system compromise.
Currently, there are no known exploits for CVE-2021-22945. However, the memory management flaw poses a significant risk, and organizations must remain vigilant in monitoring their systems for any signs of exploitation.
Vulnerability Details
The official description of CVE-2021-22945 states: "When sending data to an MQTT server, libcurl <= 7.73.0 and 7.78.0 could in some circumstances erroneously keep a pointer to an already freed memory area and both use that again in a subsequent call to send data and also free it *again*."
This vulnerability is classified under CWE-415, which refers to 'Double Free.' The impact on confidentiality is high, and there is a potential high impact on availability. The CVSS vector for this vulnerability is CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.
The affected product is libcurl, specifically versions 7.73.0 through 7.78.0. The vulnerability was published on September 23, 2021.
Technical Analysis
The root cause of CVE-2021-22945 is a flaw in the memory management of libcurl during data transmission to an MQTT server. Specifically, the library erroneously retains a pointer to an already freed memory area, leading to potential misuse in subsequent calls. This creates a scenario where attackers could exploit this memory management issue.
The attack vector is network-based, which means that an attacker can exploit this vulnerability remotely. The attack complexity is low, as it does not require any special conditions or privileges. Additionally, no user interaction is required for the attack to succeed.
The impact on confidentiality is significant, as attackers may gain access to sensitive information due to improper memory handling. However, there is no integrity impact, and the availability impact is also high, indicating that system resources may become unavailable or unstable.
Risk & Impact Analysis
The real-world deployment risk associated with CVE-2021-22945 is considerable, given its high CVSS score and the fact that it affects widely used components like libcurl. Organizations utilizing affected versions are at risk of exploitation, which could lead to unauthorized access and potential data breaches.
The urgency for organizations to address this vulnerability is critical. Failure to patch could result in severe consequences, including system downtime, data loss, and reputational damage. With the increasing prevalence of network-based attacks, this vulnerability could easily be leveraged by attackers to compromise systems.
Organizations should also consider the blast radius of this vulnerability. As libcurl is often integrated into various applications and services, the potential impact extends beyond a single system, affecting multiple interconnected systems and services.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The versions affected by CVE-2021-22945 include libcurl versions 7.73.0 through 7.78.0, along with various products and components such as Fedora, Debian Linux, MySQL Server, and NetApp firmware components.
Mitigation & Remediation
To mitigate the risks associated with CVE-2021-22945, organizations should apply the latest patches for libcurl and related software components. For more information on effective remediation strategies, organizations can refer to our penetration testing services, which can help identify and address vulnerabilities in their systems.
Organizations should ensure that they are using the latest version of libcurl, and apply any necessary configuration hardening and network controls to minimize exposure to potential attacks.
Detection Guidance
To detect potential exploitation of CVE-2021-22945, organizations should monitor for unusual behavior in network traffic to MQTT servers, as well as any log indicators that suggest unauthorized access or memory management issues.
Behavioral anomalies in application performance and unexpected crashes may also indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2021-22945 represents a critical risk as it underscores the importance of robust memory management in software development. This vulnerability highlights a trend where memory management flaws can lead to severe security incidents. Security teams should prioritize addressing such vulnerabilities to protect sensitive data and maintain system integrity.
Organizations can benefit from establishing a vulnerability management program to systematically identify and remediate vulnerabilities across their environments.
Additionally, investing in penetration testing methodologies can provide insights into potential weaknesses and improve overall security posture.
The critical nature of vulnerabilities like CVE-2021-22945 serves as a reminder for organizations to enhance their security awareness and training programs to prevent future incidents.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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