Incorrect Modular Reduction Algorithm in OpenSSL's Implementation of NIST Elliptic Curves Allows Remote Private Key Retrieval

CVE-2011-4354 · MEDIUM Severity

AV:N/AC:M/AU:N/C:P/I:P/A:N

crypto/bn/bn_nist.c in OpenSSL before 0.9.8h on 32-bit platforms, as used in stunnel and other products, in certain circumstances involving ECDH or ECDHE cipher suites, uses an incorrect modular reduction algorithm in its implementation of the P-256 and P-384 NIST elliptic curves, which allows remote attackers to obtain the private key of a TLS server via multiple handshake attempts.

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