CVE-2015-7744
MEDIUM severity · CVSS 5.9
5.9CVSS MEDIUM
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityHigh
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)5%
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.
Additional information
- NVD record
- http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.htmlAdvisory
- http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.htmlAdvisory
- http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.htmlAdvisory
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlAdvisory
- http://www.securitytracker.com/id/1034708Advisory
- https://people.redhat.com/~fweimer/rsa-crt-leaks.pdfAdvisory
- https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/Advisory