CVE-2025-25199 is a high-severity vulnerability found in the go-crypto-winnative package, which serves as the Go crypto backend for Windows utilizing the Cryptography API: Next Generation (CNG). This vulnerability allows for a memory leak to occur each time the `cng.TLS1PRF` function is called, as it does not release the key handle appropriately. The issue was identified in the package versions prior to commit f49c8e1379ea4b147d5bff1b3be5b0ff45792e41, and a fix was introduced in that commit.
The CVSS v3.1 score for this vulnerability is 7.5, indicating a high severity level. This rating reflects the potential for significant availability impact due to the memory leak that could accumulate over time, leading to resource exhaustion. Organizations utilizing this package should be aware of the potential risks associated with unpatched versions.
Currently, the exploitation status indicates that there are no known exploits available for this vulnerability, and it has not been included in the Known Exploited Vulnerabilities (KEV) catalog. However, the high exploitability score suggests that if left unaddressed, it could pose a significant risk.
Organizations should prioritize patching immediately. The fix is available in go-crypto-winnative versions 1.23.6-2 and 1.22.12-2, as well as in the pseudoversion 0.0.0-20250211154640-f49c8e1379ea. Ensuring that these updates are applied will help mitigate the risk of availability impacts and memory leaks.
Vulnerability Details
The vulnerability allows for memory leaks due to the failure to release key handles in the go-crypto-winnative package prior to the specified commit. The CVSS score of 7.5 indicates a high severity, with impacts primarily affecting availability. The affected versions include those prior to the patch introduced in commit f49c8e1379ea4b147d5bff1b3be5b0ff45792e41, which is included in the Microsoft build of Go.
Technical Analysis
The root cause of this vulnerability is linked to improper resource management in the implementation of the `cng.TLS1PRF` function. Specifically, the key handle is not released after use, leading to a gradual increase in memory consumption with each call. This issue can result in a significant impact on system performance, especially in long-running processes.
The attack vector for this vulnerability is network-based, meaning that an attacker could potentially exploit it remotely if they can invoke the function in a vulnerable application. The attack complexity is low since no special privileges or user interaction is required to trigger the memory leak.
As a result, the confidentiality and integrity impacts are rated as none, while the availability impact is rated as high due to the potential for resource exhaustion over time. This makes it critical for organizations to assess their risk exposure and take necessary actions.
Risk & Impact Analysis
The potential risk to organizations includes service disruptions resulting from the memory leak. If the leak accumulates, it could lead to application crashes or degraded performance, which can have significant impacts on user experience and operational efficiency.
This vulnerability poses a substantial risk to any deployment utilizing the affected versions of the go-crypto-winnative package. Given the high availability impact, organizations should assess their patching schedules and prioritize this vulnerability in their remediation efforts.
The urgency for organizations to address this vulnerability is high, especially for those who rely on the functionality provided by the go-crypto-winnative package. Patching should be conducted as part of the immediate security measures to prevent any possible exploitation in the future.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Affected versions include all releases prior to the fix implemented in commit f49c8e1379ea4b147d5bff1b3be5b0ff45792e41. Specifically, the patched versions are 1.23.6-2 and 1.22.12-2 of the Microsoft build of Go, as well as the pseudoversion 0.0.0-20250211154640-f49c8e1379ea for the `github.com/microsoft/go-crypto-winnative` package.
Mitigation & Remediation
To remediate this vulnerability, it is essential for organizations to update to the latest versions of the go-crypto-winnative package. The fix is included in versions 1.23.6-2 and 1.22.12-2, as stated earlier.
If immediate patching is not feasible, organizations should consider implementing workarounds such as monitoring resource usage to detect potential memory leaks. Additionally, a configuration hardening strategy should be applied to mitigate the risk of exploitation until the patch can be applied.
Furthermore, network controls should be enforced to limit access to the vulnerable system, reducing exposure to potential attacks. Continuous monitoring for unusual behavior or performance degradation should also be a part of the incident response strategy.
Organizations should validate remediation through continuous penetration testing to ensure that the patch is effective and no related issues have emerged.
Detection Guidance
To aid in the detection of potential exploitation attempts, organizations should monitor logs for indicators associated with memory usage patterns that deviate from normal behavior. This includes tracking the frequency of calls to the `cng.TLS1PRF` function and any associated error messages.
Behavioral anomalies in application performance, such as sudden spikes in memory usage, can indicate that the vulnerability may be exploited. Additionally, network signatures related to calls made to the vulnerable function should be established for monitoring.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2025-25199 highlights the ongoing need for vigilance in software management and vulnerability remediation. As memory leaks can lead to performance degradation and resource exhaustion, this vulnerability serves as a reminder for organizations to implement robust monitoring and patch management practices.
This incident represents a broader trend in the importance of maintaining updated software, particularly in critical infrastructure components like cryptographic libraries. Security teams should take this opportunity to review their dependency management strategies and ensure they are equipped to respond to similar vulnerabilities in the future.
A thorough understanding of penetration testing methodology will enhance the ability to identify and mitigate vulnerabilities before they can be exploited.
Implementing a robust vulnerability management program can significantly reduce risk and improve overall security posture.
Finally, leveraging guides for API penetration testing can provide additional insights into securing applications that rely on such cryptographic functionalities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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