CVE-2015-7744

MEDIUM

wolfSSL < 3.6.8 - Remote Private RSA Key Exposure via Lenstra Attack

Title source: llm

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.

References (9)

Core 9

Core References

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html

Broken Link, Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack

http://www.securitytracker.com/id/1034708

Release Notes, Vendor Advisory x_refsource_confirm

http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.html

Exploit, Third Party Advisory x_refsource_misc

https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf

Vendor Advisory x_refsource_confirm

http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html

Third Party Advisory x_refsource_confirm

http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html

Vendor Advisory x_refsource_confirm

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

Exploit, Third Party Advisory x_refsource_misc

https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/

Mailing List, Third Party Advisory vendor-advisory x_refsource_suse

http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html

Scores

CVSS v3 5.9

EPSS 0.0268

EPSS Percentile 86.0%

Attack Vector NETWORK

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Details

Status published

Products (5)

mariadb/mariadb 5.5.0 - 5.5.46

opensuse/leap 42.1

opensuse/opensuse 13.1

opensuse/opensuse 13.2

wolfssl/wolfssl < 3.6.8

Published Jan 22, 2016

Tracked Since Feb 18, 2026