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…
Does this matter?
Lower severity and a low EPSS score (5.03%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- EPSS
- 5.03% probability · 92th percentile
- CISA KEV
- Not listed
- Affected
- wolfssl/wolfssl · opensuse/leap · opensuse/opensuse · mariadb/mariadb
- Source
- cve@mitre.org
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.