CVE-2012-0151 in Windows
Summary
by MITRE
The Authenticode Signature Verification function in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2, R2, and R2 SP1, Windows 7 Gold and SP1, and Windows 8 Consumer Preview does not properly validate the digest of a signed portable executable (PE) file, which allows user-assisted remote attackers to execute arbitrary code via a modified file with additional content, aka "WinVerifyTrust Signature Validation Vulnerability."
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Analysis
by VulDB Data Team • 04/22/2026
The CVE-2012-0151 vulnerability represents a critical flaw in Microsoft Windows operating systems that affects authentication and code integrity verification mechanisms. This vulnerability specifically targets the WinVerifyTrust API function responsible for validating Authenticode signatures on portable executable files. The issue stems from insufficient validation of digest values during signature verification processes, creating a pathway for malicious actors to bypass security controls. The vulnerability impacts a broad range of Microsoft operating systems including Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP2, Windows Server 2008 SP2 and R2, Windows 7 Gold and SP1, and Windows 8 Consumer Preview. The flaw operates at the core of Windows code integrity enforcement, where legitimate signature validation processes fail to properly verify the cryptographic digest of modified PE files, allowing attackers to inject malicious code while maintaining a valid signature appearance.
The technical implementation of this vulnerability exploits the way Windows handles digest verification during signature validation. When a PE file is signed with Authenticode, the system computes a cryptographic digest of the file content and compares it against the digest embedded in the signature. The vulnerability occurs because the verification function does not properly validate that the digest corresponds to the actual file content, particularly when the file has been modified with additional content. Attackers can manipulate PE files by appending malicious code or altering existing sections while preserving the original signature structure, enabling execution of unauthorized code under the guise of legitimate software. This flaw operates at the application layer and leverages the trust model inherent in Windows signature verification systems, where the operating system accepts files as valid based on signature validation without proper content integrity checks. The vulnerability specifically relates to CWE-225, which addresses improper handling of signature validation and certificate verification processes, and aligns with ATT&CK technique T1553.1 for code signing policy manipulation.
The operational impact of CVE-2012-0151 extends beyond simple privilege escalation to encompass full system compromise through code execution attacks. An attacker requiring only user-assisted remote access can exploit this vulnerability by delivering a modified PE file that appears legitimate due to preserved signatures. The attack vector typically involves social engineering to convince users to execute the modified file, which then leverages the operating system's trust in valid signatures to execute malicious code. This vulnerability enables attackers to bypass security controls that rely on code signing, potentially allowing them to install rootkits, backdoors, or other persistent malware. The exploitability is enhanced by the fact that the vulnerability affects multiple Windows versions simultaneously, creating widespread exposure across enterprise environments. Organizations with legacy systems running affected Windows versions face particular risk, as these systems may not receive timely security updates or may have outdated security configurations that compound the vulnerability's impact.
Mitigation strategies for CVE-2012-0151 must address both immediate remediation and long-term security posture improvements. Microsoft released security patches through Windows Update that corrected the signature verification logic, but organizations should ensure all affected systems receive these updates promptly. System administrators should implement additional security controls such as application whitelisting policies that restrict execution of unsigned or untrusted software, regardless of signature validation status. Network security measures including intrusion detection systems and endpoint protection solutions should be configured to monitor for suspicious file execution patterns, particularly those involving modified PE files. Organizations should also consider implementing code integrity enforcement mechanisms that verify file integrity beyond signature validation, such as using Windows Defender Application Control or similar technologies. The vulnerability highlights the importance of defense-in-depth strategies where signature validation serves as one layer among multiple security controls rather than a sole mechanism for code trust validation. Regular security assessments should verify that systems properly enforce code integrity policies and that signature validation is not bypassed through configuration errors or outdated security controls.