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Advisories

openssl_encrypt before 1.4.0 Non-Standard PBKDF2 Key Derivation

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severity
high
date
Affecting

  • openssl_encrypt >= 0, < 1.4.0

CWE
  • CWE-327 Use of a Broken or Risky Cryptographic Algorithm
CVSS
8.7
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Description
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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