Crypto is Fine. The Code is Not.

Every day, new Common Vulnerabilities and Exposures (CVEs) and security advisories emerge, and the Semgrep supply-chain team examines them, identifying patterns in cryptographic advisories. These patterns often reveal that vulnerabilities arise not from the cryptographic math itself but from skipped validation checks in the code, such as improper signature verification and algorithm confusion. This insight led to an extensive analysis of the GitHub Security Advisory (GHSA) dataset, confirming that many cryptographic failures involve code errors, not mathematical ones. A real-world example is CVE-2021-43572, where a FinTech signing library failed to perform a simple range check on ECDSA signature values, allowing attackers to bypass signature verification. This recurring issue highlights the need for focusing on code validation rather than cryptography itself, as many security bugs arise from overlooked input checks. Presentations at BSidesLV and DEF CON 34 emphasize that even without a deep cryptography background, understanding what an attacker can manipulate and applying range checks can prevent these vulnerabilities.

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