CVE-2011-4354

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    CVE-2011-4354

    Published: 27 Jan 2012Last Modified: 10 Apr 2026

    Summary:

    Details: 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.

    References: http://www.debian.org/security/2012/dsa-2390, https://bugzilla.redhat.com/show_bug.cgi?id=757909, http://crypto.di.uminho.pt/CACE/CT-RSA2012-openssl-src.zip, http://cvs.openssl.org/filediff?f=openssl/crypto/bn/bn_nist.c&v1=1.14&v2=1.21, http://eprint.iacr.org/2011/633, http://marc.info/?t=119271238800004, http://openwall.com/lists/oss-security/2011/12/01/6, http://rt.openssl.org/Ticket/Display.html?id=1593&user=guest&pass=guest

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High