CVE-2023-0215 is a high-severity vulnerability affecting OpenSSL, specifically in the public API function BIO_new_NDEF. This function is responsible for streaming ASN.1 data via a BIO, primarily used to support SMIME, CMS, and PKCS7 functionalities. The vulnerability arises when the function fails to clean up properly after an error occurs, leading to a use-after-free condition that can result in application crashes. Organizations utilizing affected versions of OpenSSL should take immediate action to patch this vulnerability to avoid potential disruptions.
The CVSS score for this vulnerability is 7.5, categorizing it as high-severity. The attack vector is network-based, with low complexity and no required privileges for exploitation. This means that an attacker could potentially exploit this vulnerability without needing to be authenticated, making it a significant risk for organizations that rely on OpenSSL.
Given the potential for exploitation, organizations should prioritize patching immediately. The risk to organizations includes application crashes and possible data loss. It is crucial for security teams to assess their OpenSSL deployments and implement the necessary updates to mitigate this vulnerability.
The vulnerability was published on February 8, 2023, and affects versions of OpenSSL prior to 1.0.2zg, 1.1.1t, and 3.0.8. Organizations utilizing affected versions should ensure they are updated to the latest versions to eliminate this risk.
For those who may not be able to deploy the patch immediately, it is advised to implement additional security measures, such as network segmentation and monitoring for unusual application behavior, to reduce the risk of exploitation until the patch can be applied.
In conclusion, CVE-2023-0215 represents a serious risk to organizations using OpenSSL. By prioritizing patches and implementing additional security controls, organizations can effectively mitigate the risks associated with this vulnerability.
Vulnerability Details
The vulnerability allows for a use-after-free condition in the BIO_new_NDEF function. The function is designed to prepend a new BIO_f_asn1 filter to a given BIO for streaming ASN.1 data. However, if an error occurs during this process, the function may fail to clean up resources correctly, leading to potential crashes when subsequent operations on the BIO are performed.
The CVSS 3.1 vector string for this vulnerability is: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. This indicates that the vulnerability is exploitable over the network, requires low attack complexity, does not require privileges or user interaction, and has a high impact on availability.
Affected products include OpenSSL and the Stormshield Management Center. Organizations utilizing these products should check their versions against the specified vulnerable ranges and apply patches accordingly.
Technical Analysis
The root cause of this vulnerability lies in the improper management of memory within the BIO_new_NDEF function. Specifically, when a CMS recipient public key is invalid, the function frees the newly created filter BIO but fails to clean up the internal pointers in the BIO passed by the caller. As a result, if the caller invokes BIO_pop() on this BIO, it can lead to a use-after-free condition, resulting in crashes.
The attack vector is network-based, allowing remote attackers to exploit the vulnerability without requiring authentication. The attack complexity is low due to the straightforward nature of the exploit, and there is no requirement for user interaction. The impacts of exploitation primarily affect availability, leading to potential service disruptions.
In terms of impacts, the confidentiality and integrity of data are not affected, but the availability is significantly compromised, making it a high-risk vulnerability for service-oriented applications relying on OpenSSL.
Risk & Impact Analysis
Risk to organizations includes potential application crashes and disruptions to service availability. This vulnerability could be exploited remotely, allowing attackers to disrupt operations without needing physical access or authentication. Given the widespread use of OpenSSL in various applications, the blast radius of this vulnerability is considerable, affecting many systems.
Organizations should assess their risk posture and prioritize remediation based on the criticality of systems using OpenSSL. The urgency for patching is high due to the potential for exploitation. Organizations must address this vulnerability in their patch management cycle to maintain operational integrity.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of OpenSSL are affected by CVE-2023-0215: - All versions prior to 1.0.2zg - All versions prior to 1.1.1t - All versions prior to 3.0.8 Additionally, the Stormshield Management Center versions prior to 3.3.3 are also impacted. Organizations should ensure their systems are updated to these patched versions.
Mitigation & Remediation
To mitigate the risk associated with CVE-2023-0215, organizations should prioritize updating OpenSSL to the latest versions. The recommended versions are: - Upgrade to OpenSSL 1.0.2zg or later - Upgrade to OpenSSL 1.1.1t or later - Upgrade to OpenSSL 3.0.8 or later If immediate patching is not possible, organizations should consider implementing additional security measures, such as network segmentation to limit exposure and monitoring for abnormal behavior in systems utilizing OpenSSL.
For further guidance on securing OpenSSL implementations, organizations may consider integrating services such as penetration testing to evaluate their security posture.
Detection Guidance
Organizations should monitor logs for indicators of abnormal behavior associated with the use of OpenSSL, particularly around the BIO functions. Key indicators may include unexpected crashes, abnormal memory usage, or access to freed memory areas. Implementing behavioral anomaly detection can assist in identifying potential exploitation attempts.
AppSecure Threat Intelligence Insight
CVE-2023-0215 highlights the ongoing security challenges faced by organizations using widely adopted libraries like OpenSSL. This vulnerability underscores the critical importance of regular updates and patch management in software security. As the landscape of vulnerabilities continues to evolve, it is essential for security teams to stay vigilant and proactive in their approach.
Organizations should consider adopting a comprehensive vulnerability management program to effectively manage and mitigate risks associated with vulnerabilities.
In conclusion, the lessons learned from CVE-2023-0215 should inform future development and risk assessment strategies, guiding organizations to prioritize security in their software supply chains and deployment practices.
For further reading on best practices in application security, consider reviewing our guide on penetration testing methodology.
Organizations should also explore the benefits of security testing to uncover potential weaknesses in their systems.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)