CVE-2024-21502

Summary

CVE-2024-21502 is a vulnerability affecting versions of the fastecdsa package prior to 2.3.2. The issue lies in the curvemath_mul function found in src/curveMath.c, where an uninitialized variable is used and misinterpreted as a user-defined type. Depending on the value of this variable, an attacker could execute arbitrary free() or realloc() functions, null pointer dereferencing, and other malicious actions. Since the stack can be controlled by the attacker, this vulnerability potentially allows for corrupting the allocator structure, leading to potential heap exploitation. An attacker could cause a denial of service by successfully exploiting this vulnerability.

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