The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host. This vulnerability is classified with a CVSS score of 4.5, indicating a medium severity level. The risk to organizations includes potential information leakage and system instability, which could lead to further attacks if not addressed in a timely manner.
Currently, there are no known public exploits for this vulnerability. However, given the nature of the out-of-bounds read, it poses a risk, especially in environments where the openssl crate is utilized. Organizations should prioritize patching immediately.
The vulnerability was published on July 28, 2025, and has been analyzed thoroughly. It is essential for developers and organizations using the affected versions of the openssl crate to take this issue seriously and assess their systems accordingly.
Given its classification, organizations utilizing the openssl crate should ensure they are running versions that have been patched to mitigate the risks associated with this vulnerability.
Vulnerability Details
The openssl crate before 0.10.55 for Rust allows an out-of-bounds read via an empty string to X509VerifyParamRef::set_host. The CVSS score provided by NVD is 9.1, indicating critical severity, while the CVSS score from Mitre is 4.5, indicating medium severity. The discrepancy suggests variances in the attack vectors considered by different analysis sources.
This vulnerability has a CWE classification of CWE-126, which refers to an out-of-bounds read. The affected product is the openssl crate by sfackler, and organizations are urged to check their dependency versions.
The vulnerability was published on July 28, 2025, and its details can be referenced through various sources like the RustSec advisory database.
Technical Analysis
The root cause of CVE-2023-53159 is an implementation flaw within the openssl crate. Specifically, the issue arises when an empty string is passed to the X509VerifyParamRef::set_host method, leading to a potential out-of-bounds read. This vulnerability requires local access to trigger, making the attack vector local with high complexity.
The attack complexity is considered high, as it requires an attacker to possess knowledge of the specific implementation and exploit it accordingly. There are no privileges required to exploit this vulnerability, nor is user interaction necessary. The impacts include low confidentiality and availability impact, while there is no integrity impact.
Risk & Impact Analysis
Risk to organizations includes potential data exposure due to the out-of-bounds read. While the CVSS score suggests it is not critical, the ability to trigger instability in systems using the openssl crate should not be overlooked. Organizations are advised to assess their exposure and remediate accordingly.
The potential blast radius of this vulnerability depends on the deployment of the openssl crate in production environments. Organizations should evaluate their systems to understand the implications better. Given its low exploitability score, it may not be actively exploited, but the possibility exists.
Urgency for addressing this vulnerability is moderate, as it is essential to prevent any potential exploitation in the future. Organizations should schedule remediation in their patch cycles.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerable versions of the openssl crate are those prior to 0.10.55. Organizations are encouraged to upgrade to the latest version to mitigate this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching the openssl crate to version 0.10.55 or later. If immediate patching is not feasible, consider implementing workarounds such as restricting access to the affected functionalities and conducting thorough code reviews.
Application security assessments can also help identify potential risks associated with using outdated libraries.
Detection Guidance
To detect potential exploitation attempts, organizations should monitor logs for unusual access patterns or errors related to the openssl crate. Behavioral anomalies in the application can also indicate a possible exploitation attempt.
AppSecure Threat Intelligence Insight
The significance of CVE-2023-53159 lies in the ongoing reliance on libraries like openssl within Rust applications. It highlights the necessity for organizations to maintain an updated inventory of dependencies and continuously monitor for vulnerabilities.
This vulnerability represents a trend in which seemingly low-risk vulnerabilities can lead to critical security issues if not managed properly. Security teams should ensure that their applications are regularly assessed for outdated dependencies.
Vulnerability management programs play a critical role in this process.
Penetration testing methodologies can also provide insights into potential weaknesses that could be exploited, reinforcing the importance of proactive security measures.
API security best practices should also be integrated into the development lifecycle to mitigate risks associated with library vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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