A bug has been identified in OpenSSL's handling of key and initialization vector (IV) lengths, impacting versions 3.0 and 3.1. This vulnerability allows potential truncation or overruns during the initialization of some symmetric ciphers, particularly those utilizing the RC2, RC4, RC5, CCM, GCM, and OCB modes. The nature of this vulnerability raises serious concerns regarding the confidentiality of encrypted data.
With a CVSS score of 7.5, this vulnerability is classified as high severity, indicating that it poses a significant risk to organizations using affected versions of OpenSSL. The potential loss of confidentiality due to non-unique IVs can lead to severe consequences, including unauthorized data access.
Organizations should prioritize patching immediately. While the probability of an application being vulnerable is low, the implications of exploitation necessitate swift remediation actions.
The OpenSSL SSL/TLS implementation remains unaffected, and the issue lies outside the boundaries of the FIPS provider, thus not impacting OpenSSL 3.0 and 3.1 FIPS providers.
For developers and organizations using OpenSSL, it is crucial to evaluate the impact of this vulnerability and take necessary measures to secure their systems against potential exploitation.
Vulnerability Details
The vulnerability arises from improper processing of key and IV lengths when using the EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2(), or EVP_CipherInit_ex2() functions. The alterations to key and IV lengths within the OSSL_PARAM array do not take effect as intended, potentially leading to truncation or overreading of these values.
Impactful cipher modes include RC2, RC4, RC5, CCM, GCM, and OCB. For GCM, truncation of the IV can cause reuse, violating NIST's SP 800-38D guidance, which can lead to confidentiality breaches. Memory exceptions may also be triggered as a result of these issues, although they are not currently classified as critical to security.
The OpenSSL community and developers should remain vigilant and ensure proper configurations are in place to mitigate the risk associated with this vulnerability.
Technical Analysis
The root cause of the vulnerability lies in how OpenSSL processes key and IV lengths after they have been set. The attack vector is network-based, with low attack complexity and no required privileges or user interaction. This makes it easier for attackers to exploit the vulnerability without needing to authenticate or interact with the system.
The confidentiality impact is assessed as high, given that improper handling of key and IV lengths could allow unauthorized access to sensitive data. Integrity and availability impacts are rated as none.
Risk & Impact Analysis
Organizations using affected versions of OpenSSL could face significant risks, including data breaches and loss of confidentiality. The blast radius potential could extend to any application utilizing the vulnerable ciphers, heightening the urgency for patching and remediation.
As the vulnerability could lead to IV reuse, the implications may include unauthorized data access and violation of compliance regulations. Given the moderate severity assessment and the potential for exploitation, organizations should address this vulnerability in their priority patch cycle.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
OpenSSL versions 3.0.0 to 3.0.11 and 3.1.0 to 3.1.3 are affected by this vulnerability. Organizations using these versions should ensure that they are updated to the latest patched versions.
Mitigation & Remediation
Organizations should prioritize patching by updating OpenSSL to the latest versions. For those unable to apply immediate patches, consider implementing configuration hardening measures and network controls to minimize exposure.
Continuous monitoring and security assessments such as penetration testing can also help to detect and remediate vulnerabilities effectively.
Detection Guidance
Monitoring for abnormal behavior in applications utilizing affected OpenSSL versions is critical. Log indicators should include any unexpected errors during encryption or decryption processes and any unusual memory exceptions. Behavioral anomalies may indicate attempts to exploit this vulnerability.
AppSecure Threat Intelligence Insight
This vulnerability highlights the importance of rigorously testing cryptographic implementations within applications. Security teams should consider adopting a penetration testing methodology to identify potential weaknesses in cryptographic practices. Furthermore, organizations should review their vulnerability management program to ensure that cryptographic libraries are regularly updated and tested for vulnerabilities.
As the landscape of cyber threats evolves, organizations must remain vigilant and proactive in their security measures. Regular assessments and updates can significantly reduce the risk posed by vulnerabilities such as CVE-2023-5363.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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