Description
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.
Metrics
CVSS 3.1 5.9/10
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:NAffected software
| Vendor | Product | Versions |
|---|---|---|
| n/a | n/a | n/a |
References
- 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
Timeline
- Published
- Jan 22, 2016
- Last modified
- Jun 17, 2026
- NVD status
- Modified