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Advisories

openssl_encrypt before 1.4.6 KDF Bypass via Sequential-XOR

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severity
medium
date
Affecting

  • openssl_encrypt >= 0, < 1.4.6

CWE
  • CWE-916 Use of Password Hash With Insufficient Computational Effort
CVSS
6.9
CVSS V4 Vector
CVSS:4.0/AV:L/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 1.4.6 contain a key derivation flaw in sequential XOR composition mode where the last stage cancels out during key generation. When configured with a single KDF and no prior hashing stage, attackers can bypass memory-hard key derivation and perform offline password cracking at SHA-256 speed instead of the configured KDF cost.

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