CVE-2015-7744

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    CVE-2015-7744

    Published: 22 Jan 2016Last Modified: 10 Apr 2026

    Summary:

    Details: wolfSSL (formerly CyaSSL) before 3.6.8 does not properly handle faults associated with the Chinese Remainder Theorem (CRT) process when allowing ephemeral key exchange without low memory optimizations on a server, which makes it easier for remote attackers to obtain private RSA keys by capturing TLS handshakes, aka a Lenstra attack.

    References: http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html, http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html, http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.html, http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html, http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html, http://www.securitytracker.com/id/1034708, https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf, https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/, https://wolfssl.com/wolfSSL/Blog/Entries/2015/9/17_Two_Vulnerabilities_Recently_Found%2C_An_Attack_on_RSA_using_CRT_and_DoS_Vulnerability_With_DTLS.html, http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html, http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html, https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf, https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/, http://www.securitytracker.com/id/1034708

    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
    CVE-2015-7744 | CVE-DB