Ddos 
A vulnerability in the Trusted Platform Module (TPM) 2.0 reference implementation has been disclosed, potentially allowing attackers to access sensitive memory contents or disrupt trusted computing operations. Tracked as CVE-2025-2884, the flaw affects the CryptHmacSign function in the TPM 2.0 library maintained by the Trusted Computing Group (TCG).
According to the official CERT/CC note, this vulnerability can be exploited by sending specially crafted TPM commands, enabling an attacker with local access to trigger a read beyond the intended memory bounds.
“An attacker with access to a TPM command interface can exploit this vulnerability by sending specially crafted commands, potentially leading to unauthorized access to sensitive data or denial of service of the TPM,” CERT/CC explains.
The Trusted Platform Module is a hardware-based cryptographic processor built into many modern PCs, servers, and embedded systems. It provides secure storage for encryption keys, certificates, and authentication credentials. TPM is foundational to many security features including BitLocker, Secure Boot, and measured boot.
The vulnerability stems from a lack of consistency checks in the CryptHmacSign function. This oversight enables an attacker to feed a maliciously crafted packet to the TPM interface, leading to an out-of-bounds (OOB) memory read — potentially leaking sensitive information like cryptographic material or internal TPM data structures.
“The issue arises because the reference code did not implement appropriate consistency checks in CryptHmacSign function resulting in potential out-of-bound read.”
The vulnerability can only be triggered by a local, authenticated attacker who has access to the system’s TPM command interface. In practice, this limits exploitation to multi-user environments or compromised systems where privilege escalation is part of a broader attack chain.
“An authenticated local attacker can send malicious commands to a vulnerable TPM interface, resulting in information disclosure or denial of service.”
It is important to note that the actual impact may vary depending on how vendors have integrated and configured the TPM module.
To address the issue, the Trusted Computing Group has published an errata update to the TPM 2.0 Library Specification (Version 1.83) and revised the reference implementation to fix the faulty memory access.
Administrators and OEMs are strongly advised to apply firmware updates provided by their TPM vendors or system manufacturers. In enterprise environments, TPM firmware should be routinely checked as part of endpoint integrity assessments.
Related Posts:
- Microsoft Emphasizes TPM 2.0 as a “Necessity” for Secure Windows 11 Deployment
- Microsoft Urges TPM 2.0 for Windows 11 Upgrade as Win 10 Support Nears End
- Windows 11’s TPM 2.0: Free Software Foundation Fights Forced Upgrades and E-Waste
- Two security flaws (CVE-2023-1017 & CVE-2023-1018) found on Trusted Platform Module 2.0
Donate