CVE-2013-7463: CBC IV Vulnerability in aescrypt Ruby Gem

The core impact of CVE-2013-7463 lies in the potential for chosen plaintext attacks. An attacker, by carefully crafting specific input data, can manipulate the encryption process and recover sensitive information without needing to break the underlying AES encryption algorithm itself. This is because the predictable IV allows the attacker to deduce relationships between plaintext and ciphertext. The data at risk includes any sensitive information encrypted using the vulnerable aescrypt gem, such as passwords, API keys, or personal data. While lateral movement isn't a direct consequence, a successful compromise could lead to data exfiltration and further attacks if the compromised data is used to access other systems.

1. Published2017-10-24
2. Modified2024-02-16
3. EPSS updated2026-04-02

The primary mitigation for CVE-2013-7463 is to upgrade to a patched version of the aescrypt gem. Unfortunately, no official patch was released for the original version. As a workaround, avoid using the aescrypt gem for encrypting sensitive data. If you absolutely must use it, implement strict input validation and consider using a different encryption library with stronger IV randomization. Carefully review any existing code that utilizes the aescrypt gem and replace it with a more secure alternative. There are no specific WAF or proxy rules that can directly address this vulnerability, as it resides within the application code.