fastecdsa@1.7.2 vulnerabilities

fastecdsa is a python package for doing fast elliptic curve cryptography, specifically digital signatures.

Affected versions of this package are vulnerable to Use of Uninitialized Variable on the stack, via the curvemath_mul function in src/curveMath.c, due to being used and interpreted as user-defined type. Depending on the variable's actual value it could be arbitrary free(), arbitrary realloc(), null pointer dereference and other. Since the stack can be controlled by the attacker, the vulnerability could be used to corrupt allocator structure, leading to possible heap exploitation. The attacker could cause denial of service by exploiting this vulnerability.

Upgrade fastecdsa to version 2.3.2 or higher.

fastecdsa is a python package for doing fast elliptic curve cryptography, specifically digital signatures.

Affected versions of this package are vulnerable to Timing Attack. When using the NIST P-256 curve in the ECDSA implementation, the point at infinity is mishandled. This means that for an extreme value in k and s^-1, the signature verification fails even if the signature is correct. There are some threat models where an attacker can benefit by successfully guessing users for whom signature verification will fail.

Upgrade fastecdsa to version 2.1.2 or higher.

fastecdsa is a python package for doing fast elliptic curve cryptography, specifically digital signatures.

Affected versions of this package are vulnerable to Timing Attack. Practical recovery of the long-term private key generated by the library is possible under certain conditions. Leakage of bit-length of a scalar during scalar multiplication is possible on an elliptic curve which might allow practical recovery of the long-term private key.

Upgrade fastecdsa to version 2.1.4 or higher.