Fortinet Discovers Windows PE Signature Spoofing Vulnerability
Fortinet's FortiGuard Labs has discovered a vulnerability to bypass Windows PE Authenticode signature validation.
The Portable Executable (PE) format is a file format for executables, object code, DLLs and others used in Microsoft Windows operating systems. The PE format is a data structure that encapsulates the information necessary for the Windows OS loader to manage the wrapped executable code.
A bypass vulnerability has been discovered in Windows PE Authenticode signature validation. The vulnerability exists due to the signature computation mechanism. It could allow an attacker to disguise an altered executable as legitimate software.
Users should apply the solution provided by Microsoft.
Fortinet reported the vulnerability to Microsoft on June 24, 2021.
Microsoft confirmed the vulnerability on June 29, 2021.
Microsoft patched the vulnerability on September 14, 2021.