| Package | Affected versions | Patched versions |
|---|---|---|
| openssl-encrypt | < 1.4.0 | 1.4.0 |
| openssl encrypt | < 1.4.0 | 1.4.0 |
openssl_encrypt versions before 1.4.0 use a non-standard PBKDF2 key derivation construction with iterations=1 per call in an outer loop, creating a KDF whose security properties have not been formally analyzed. Attackers can exploit this weakened key derivation to more efficiently crack passwords protecting legacy encrypted files compared to standard PBKDF2 implementations.
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