A vulnerability has been identified in the TCG TPM2.0 Reference implementation, specifically within the CryptHmacSign helper function. This vulnerability allows for out-of-bounds read due to the lack of validation of the signature scheme with the signature key's algorithm. The potential impacts of this vulnerability highlight the need for organizations to take immediate action.
With a CVSS score of 6.6, this vulnerability is classified as medium severity. It poses a risk to organizations that utilize the TCG TPM2.0 Reference implementation, particularly as it allows attackers to read beyond the intended boundaries of memory, potentially exposing sensitive data.
As exploitation status remains unconfirmed, organizations should prioritize patching this vulnerability in their systems. The urgency is underscored by the potential for serious consequences if left unaddressed.
Organizations should prioritize addressing this vulnerability to safeguard their systems and mitigate potential risks.
Vulnerability Details
The TCG TPM2.0 Reference implementation's CryptHmacSign helper function is vulnerable to out-of-bounds read due to insufficient validation of the signature scheme with the signature key's algorithm. This issue has been documented in Errata Revision 1.83 and advisory TCGVRT0009 for the TCG standard TPM2.0.
The CVSS score of 6.6 indicates a medium severity level, suggesting that organizations should address this vulnerability in their priority patch cycle. The affected component is the TCG TPM2.0 Reference implementation, and the vulnerability was published on June 10, 2025.
Additionally, this vulnerability is classified under CWE-125, which pertains to out-of-bounds read issues.
Technical Analysis
The root cause of this vulnerability is the failure to properly validate the signature scheme in conjunction with the signature key's algorithm before executing the CryptHmacSign function. This oversight can lead to an out-of-bounds read, which can be exploited if an attacker can influence the data being processed.
The attack vector for this vulnerability is local, requiring an attacker to have local access to the system where the vulnerable implementation is running. The complexity of the attack is low, as it does not require significant effort to execute the out-of-bounds read.
The vulnerability requires low privileges to exploit, and user interaction is required, which means a user must trigger the vulnerable function in some way. The confidentiality impact is high, as sensitive information could potentially be disclosed, while the integrity impact is none, and the availability impact is high.
Risk & Impact Analysis
The risk to organizations includes potential unauthorized access to sensitive data through out-of-bounds reads. This could lead to data breaches or information leakage, significantly impacting the confidentiality of critical data.
Furthermore, the medium severity of this vulnerability necessitates that organizations address it in their priority patch cycle. The urgency is further emphasized by the possibility of high availability impact, which could disrupt services reliant on the vulnerable implementation.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
Currently, there are no specific affected versions documented for this vulnerability. Organizations should consider all versions prior to any available vendor patches as potentially vulnerable.
Mitigation & Remediation
To mitigate this vulnerability, organizations should prioritize applying patches as they become available. Additionally, implementing configuration hardening practices and network controls can help reduce the attack surface.
Organizations should validate remediation effectiveness through penetration testing to ensure all vulnerabilities are addressed.
Detection Guidance
To detect potential exploitation attempts of this vulnerability, organizations should monitor logs for indicators of out-of-bounds access and look for behavioral anomalies in the CryptHmacSign function. Regular security audits and reviews can also aid in identifying changes that may indicate exploitation.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability lies in its representation of potential weaknesses in cryptographic implementations. Organizations should learn from this incident to enhance their development and testing practices.
It is crucial for security teams to stay informed about ongoing vulnerabilities and trends in the industry to proactively address similar issues. The strategic takeaway is that continuous security assessments and updates are necessary for robust defense.
For additional resources, consider reviewing our guide on vulnerability management programs and best practices for penetration testing to stay ahead of potential threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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