Microsoft Control Flow Guard (CFG) is a security feature that helps prevent buffer overflow attacks by placing limitations on where a program can execute code in memory. This helps protect against various types of memory corruption vulnerabilities.
CFG works by adding a validation check before a function call to ensure that the destination address of the call is a legitimate target. If the target address does not pass this validation check, the program will terminate execution, preventing the attack from being successful.
A recent discovery by security researchers has revealed a design weakness in Microsoft CFG that allows for a complete bypass of its protections. This weakness can be exploited by attackers to execute arbitrary code in a way that circumvents the CFG safeguards.
The bypass exploits the fact that the CFG validation check is only performed on direct function calls and not on indirect calls through function pointers. By redirecting the flow of execution through a legitimate function pointer, an attacker can bypass the CFG protection mechanism.
This vulnerability is considered to be quite serious as it undermines the fundamental purpose of CFG, which is to prevent code execution from being redirected to malicious locations in memory. It poses a significant risk to the security of systems that rely on CFG for protection against buffer overflow attacks.
If successfully exploited, this weakness in Microsoft CFG could allow attackers to gain unauthorized access to sensitive data, escalate privileges, and execute malicious code on a target system. This poses a serious threat to the integrity and security of organizations using CFG as a defense mechanism.
In conclusion, the design weakness in Microsoft CFG that allows for a complete bypass of its protections is a significant security risk that requires immediate attention and remediation. Organizations utilizing CFG should take steps to mitigate the vulnerability and enhance their overall security posture. It is important to stay vigilant and proactive in addressing such vulnerabilities to protect against potential cyber threats.|
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Microsoft CFG vulnerability allows full system bypass.