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 attackers to obtain private RSA keys by capturing TLS handshakes, aka a Lenstra attack.

CVSS v3.0 5.9 MEDIUM
CVSS v2.0 2.6 LOW

5.9^/10

CVSS v3.0 : MEDIUM

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

Exploitability : 2.2 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity HIGH

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

2.6^/10

CVSS v2.0 : LOW

Vector : AV:N/AC:H/Au:N/C:P/I:N/A:N

Exploitability : 4.9 / Impact : 2.9

Access Vector NETWORK

Access Complexity HIGH

Authentication NONE

Confidentiality Impact PARTIAL

Integrity Impact NONE

Availability Impact NONE

References

Link	Resource
https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf	Exploit
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	Vendor Advisory
http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.html
http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html	Vendor Advisory
https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/	Exploit
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html
http://www.securitytracker.com/id/1034708

Configurations

Configuration 1 (hide)

cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*

Configuration 2 (hide)

OR	cpe:2.3:o:opensuse:opensuse:13.2:::::::*
	cpe:2.3:o:opensuse:leap:42.1:::::::*

Information

Published : 2016-01-22 15:59

Updated : 2018-10-30 16:27

NVD link : CVE-2015-7744

Mitre link : CVE-2015-7744

JSON object : View

Products Affected

opensuse

leap
opensuse

wolfssl

wolfssl

CWE

CWE-19

Data Processing Errors

{"cve": {"data_type": "CVE", "references": {"reference_data": [{"url": "https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf", "name": "https://people.redhat.com/~fweimer/rsa-crt-leaks.pdf", "tags": ["Exploit"], "refsource": "MISC"}, {"url": "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", "name": "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", "tags": ["Vendor Advisory"], "refsource": "CONFIRM"}, {"url": "http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.html", "name": "http://wolfssl.com/wolfSSL/Docs-wolfssl-changelog.html", "tags": [], "refsource": "CONFIRM"}, {"url": "http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html", "name": "http://www.oracle.com/technetwork/topics/security/cpujan2016-2367955.html", "tags": ["Vendor Advisory"], "refsource": "CONFIRM"}, {"url": "https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/", "name": "https://securityblog.redhat.com/2015/09/02/factoring-rsa-keys-with-tls-perfect-forward-secrecy/", "tags": ["Exploit"], "refsource": "MISC"}, {"url": "http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00015.html", "name": "openSUSE-SU-2016:0367", "tags": [], "refsource": "SUSE"}, {"url": "http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html", "name": "http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html", "tags": [], "refsource": "CONFIRM"}, {"url": "http://lists.opensuse.org/opensuse-security-announce/2016-02/msg00016.html", "name": "openSUSE-SU-2016:0377", "tags": [], "refsource": "SUSE"}, {"url": "http://www.securitytracker.com/id/1034708", "name": "1034708", "tags": [], "refsource": "SECTRACK"}]}, "data_format": "MITRE", "description": {"description_data": [{"lang": "en", "value": "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."}]}, "problemtype": {"problemtype_data": [{"description": [{"lang": "en", "value": "CWE-19"}]}]}, "data_version": "4.0", "CVE_data_meta": {"ID": "CVE-2015-7744", "ASSIGNER": "cve@mitre.org"}}, "impact": {"baseMetricV2": {"cvssV2": {"version": "2.0", "baseScore": 2.6, "accessVector": "NETWORK", "vectorString": "AV:N/AC:H/Au:N/C:P/I:N/A:N", "authentication": "NONE", "integrityImpact": "NONE", "accessComplexity": "HIGH", "availabilityImpact": "NONE", "confidentialityImpact": "PARTIAL"}, "severity": "LOW", "impactScore": 2.9, "obtainAllPrivilege": false, "exploitabilityScore": 4.9, "obtainUserPrivilege": false, "obtainOtherPrivilege": false, "userInteractionRequired": false}, "baseMetricV3": {"cvssV3": {"scope": "UNCHANGED", "version": "3.0", "baseScore": 5.9, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "HIGH", "availabilityImpact": "NONE", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 3.6, "exploitabilityScore": 2.2}}, "publishedDate": "2016-01-22T15:59Z", "configurations": {"nodes": [{"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true, "versionEndIncluding": "3.6.6"}]}, {"children": [], "operator": "OR", "cpe_match": [{"cpe23Uri": "cpe:2.3:o:opensuse:opensuse:13.2:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}, {"cpe23Uri": "cpe:2.3:o:opensuse:leap:42.1:*:*:*:*:*:*:*", "cpe_name": [], "vulnerable": true}]}], "CVE_data_version": "4.0"}, "lastModifiedDate": "2018-10-30T16:27Z"}