CVE-2026-13758— CryptX versions before 0.088_001 for Perl compare AEAD authentication tags in non-constant time in the streaming decrypt_done path

CryptX versions before 0.088_001 for Perl compare AEAD authentication tags in non-constant time in the streaming decrypt_done path

CryptX versions before 0.088_001 for Perl compare AEAD authentication tags in non-constant time in the streaming decrypt_done path. The decrypt_done($tag) form compares it against the computed tag with memNE (memcmp() != 0), which short-circuits on the first differing byte, so its run time depends on the number of matching leading bytes. This affects all five AEAD modes: GCM, CCM, ChaCha20Poly1305, EAX and OCB. The one-shot *_decrypt_verify helpers are unaffected; they verify the tag inside libtomcrypt with a constant-time comparison. The timing difference is a tag-verification oracle. An attacker who can submit many candidate tags for the same nonce, ciphertext and associated data while measuring the timing precisely enough may recover the expected tag byte by byte and forge a message that verifies.

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通过时间差异性导致的信息暴露

MIK CryptX 日志信息泄露漏洞

MIK CryptX是MIK的服务器软件。 MIK CryptX 0.088_001之前版本存在日志信息泄露漏洞，该漏洞源于在流式decrypt_done路径中AEAD认证标签比较未使用恒定时间，其运行时间取决于匹配的前导字节数，从而构成标签验证侧信道，攻击者可通过提交大量候选标签恢复预期标签并伪造通过验证的消息。

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