CVE-2015-7744

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.

• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.htmlMailing List, Third Party Advisory
• http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.htmlRelease Notes, Vendor Advisory
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
• http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.htmlVendor Advisory
• http://www.securitytracker.com/id/1034708Broken Link, Third Party Advisory, VDB Entry
• https://people.redhat.com/~fweimer/rsa-crt-leaks.pdfExploit, Third Party Advisory
• https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/Exploit, Third Party Advisory
• 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.htmlVendor Advisory
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.htmlMailing List, Third Party Advisory
• http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.htmlMailing List, Third Party Advisory
• http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.htmlRelease Notes, Vendor Advisory
• http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlThird Party Advisory
• http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.htmlVendor Advisory
• http://www.securitytracker.com/id/1034708Broken Link, Third Party Advisory, VDB Entry
• https://people.redhat.com/~fweimer/rsa-crt-leaks.pdfExploit, Third Party Advisory
• https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/Exploit, Third Party Advisory
• 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.htmlVendor Advisory

Published

Jan 22, 2016

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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