CVE-2021-33929 is a high-severity buffer overflow vulnerability found in the function pool_disabled_solvable within the source file src/repo.h of the libsolv library, applicable to versions prior to 0.7.17. This vulnerability allows attackers to cause a Denial of Service (DoS), which can disrupt the normal operation of affected systems. Given its CVSS score of 7.5, the risk to organizations includes significant availability impacts, making this a critical issue that requires immediate attention.
The vulnerability was published on September 2, 2021, and has since been modified to reflect the ongoing assessment of its impact. The nature of the buffer overflow means that it can be exploited remotely, with low complexity, and without the need for user interaction or privileges, making it particularly concerning for organizations using affected versions of libsolv.
Organizations should prioritize patching immediately to mitigate the risks associated with this vulnerability. The availability impact is rated as high, indicating that successful exploitation could lead to significant service disruptions. It is essential for security teams to assess their systems and ensure that they are running versions of libsolv that have been updated to version 0.7.17 or later.
As of now, there are no confirmed public exploits or proof of concept (PoC) available for this vulnerability, but the potential for exploitation exists. Organizations should remain vigilant and monitor their systems for any signs of unusual activity associated with this vulnerability.
Given the current threat landscape, it is advisable for organizations to implement proactive measures, including regular updates and security assessments, to defend against similar vulnerabilities that may arise in the future.
Vulnerability Details
The official description for CVE-2021-33929 indicates that it allows for a buffer overflow in the source file src/repo.h of libsolv versions prior to 0.7.17, facilitating potential Denial of Service attacks. The CVSS score of 7.5 categorizes it as a high-severity vulnerability, emphasizing the importance of addressing it promptly.
The vulnerability is classified under CWE-787, which pertains to improper control of the length of a buffer. Organizations utilizing openSUSE's libsolv should review their configurations to ensure they are not exposed to this risk.
Technical Analysis
The root cause of this vulnerability is a buffer overflow that occurs due to inadequate bounds checking in the pool_disabled_solvable function. This function fails to properly handle input sizes, leading to memory corruption. The attack vector is network-based, meaning that an attacker can exploit this vulnerability remotely. The attack complexity is rated as low, as the exploitation does not require any special conditions or user interaction.
There are no specific privileges required to exploit this vulnerability, making it accessible to unauthenticated attackers. Additionally, user interaction is not necessary, as the vulnerability can be triggered automatically through crafted network requests. The impact on availability is rated as high, indicating that successful exploitation can lead to service outages.
Risk & Impact Analysis
The real-world risk associated with CVE-2021-33929 is significant, particularly for organizations that rely on openSUSE's libsolv for package management and dependency resolution. The potential for Denial of Service attacks could disrupt various services, impacting business operations. Organizations should evaluate the blast radius of this vulnerability, especially in environments where libsolv is extensively used.
Given the high CVSS score and the fact that it is not included in the Known Exploited Vulnerability (KEV) catalog, organizations should assess their risk posture and prioritize remediation efforts. The urgency for addressing this vulnerability is classified as high, necessitating immediate attention during the patch management cycle.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected product is libsolv, with the vulnerable versions being all versions prior to 0.7.17. Organizations using these versions should upgrade immediately to mitigate the risk posed by this vulnerability.
Mitigation & Remediation
Organizations should implement the following remediation steps to protect against CVE-2021-33929:
1. Upgrade libsolv to version 0.7.17 or later.
2. Regularly apply security patches and updates to all software components.
3. Consider implementing network controls to restrict access to critical services.
4. Engage in continuous penetration testing to identify potential vulnerabilities and validate remediation.
5. Monitor systems for unusual activity that may indicate an attempted exploit.
Detection Guidance
Organizations should implement the following detection strategies:
1. Monitor logs for error messages that may indicate buffer overflow attempts.
2. Watch for behavioral anomalies in server performance that could signal an ongoing attack.
3. Implement network signatures to detect known exploit attempts.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-33929 lies in its representation of vulnerabilities commonly found in library implementations. It serves as a reminder for security teams to regularly audit their dependencies and ensure that all components are secure.
This vulnerability highlights the critical nature of timely updates and proactive security measures. Organizations can learn from this incident the importance of integrating security practices into their development pipelines.
A comprehensive penetration testing methodology can further assist in identifying and mitigating risks associated with similar vulnerabilities.
Establishing a robust vulnerability management program will enable organizations to stay ahead of emerging threats and maintain a secure operational environment.
Additionally, following best practices for API security can help protect against similar vulnerabilities in the future.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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