CVE-2015-7744

Severity Score

5.9

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

wolfSSL (anteriormente CyaSSL) en versiones anteriores a 3.6.8 no maneja correctamente fallos asociados con el proceso Chinese Remainder Theorem (CRT) cuando permiten el intercambio de claves efímeras sin optimizaciones de memoria baja en un servidor, lo que hace que sea más fácil para atacantes remotos obtener claves privadas RSA mediante la captura de un apretón de manos TLS, también conocido como un ataque Lenstra.

*Credits: N/A

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

None

Attack Vector

Network

Attack Complexity

High

Authentication

None

Confidentiality

Partial

Integrity

None

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2015-10-07 CVE Reserved
2016-01-22 CVE Published
2023-08-06 EPSS Updated
2024-08-06 CVE Updated
2024-08-06 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CAPEC

References (9)

URL	Tag	Source
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html	Third Party Advisory
http://www.securitytracker.com/id/1034708	Broken Link

URL	Date	SRC
https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf	2024-08-06
https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy	2024-08-06

URL	Date	SRC

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html	2022-08-29
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html	2022-08-29
http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.html	2022-08-29
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html	2022-08-29
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	2022-08-29

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Wolfssl Search vendor "Wolfssl"		Wolfssl Search vendor "Wolfssl" for product "Wolfssl"				< 3.6.8 Search vendor "Wolfssl" for product "Wolfssl" and version " < 3.6.8"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				42.1 Search vendor "Opensuse" for product "Leap" and version "42.1"		-		Affected
Opensuse Search vendor "Opensuse"		Opensuse Search vendor "Opensuse" for product "Opensuse"				13.1 Search vendor "Opensuse" for product "Opensuse" and version "13.1"		-		Affected
Opensuse Search vendor "Opensuse"		Opensuse Search vendor "Opensuse" for product "Opensuse"				13.2 Search vendor "Opensuse" for product "Opensuse" and version "13.2"		-		Affected
Mariadb Search vendor "Mariadb"		Mariadb Search vendor "Mariadb" for product "Mariadb"				>= 5.5.0 < 5.5.46 Search vendor "Mariadb" for product "Mariadb" and version " >= 5.5.0 < 5.5.46"		-		Affected
Mariadb Search vendor "Mariadb"		Mariadb Search vendor "Mariadb" for product "Mariadb"				>= 10.0.0 < 10.0.22 Search vendor "Mariadb" for product "Mariadb" and version " >= 10.0.0 < 10.0.22"		-		Affected
Mariadb Search vendor "Mariadb"		Mariadb Search vendor "Mariadb" for product "Mariadb"				>= 10.1.0 < 10.1.9 Search vendor "Mariadb" for product "Mariadb" and version " >= 10.1.0 < 10.1.9"		-		Affected