CVE-2023-4039

Summary

CVE-2023-4039 is a vulnerability in GCC-based toolchains for AArch64 systems. This issue involves a flaw in the -fstack-protector feature, which can allow an attacker to bypass the stack protector and exploit a buffer overflow in dynamically-sized local variables without being detected. Statically-sized local variables or those created using standard allocation techniques are not impacted by this issue. When the stack-protector does detect an overflow, it terminates the application, but an attacker who can exploit a buffer overflow without triggering the stack-protector might cause an uncontrolled loss of availability, as well as potential impacts on confidentiality or integrity. However, it's important to note that the GCC project disputes the characterization of this as a vulnerability, arguing instead that it is a missed hardening bug.

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