CVE-2020-1967

Segmentation fault in SSL_check_chain

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Server or client applications that call the SSL_check_chain() function during or after a TLS 1.3 handshake may crash due to a NULL pointer dereference as a result of incorrect handling of the "signature_algorithms_cert" TLS extension. The crash occurs if an invalid or unrecognised signature algorithm is received from the peer. This could be exploited by a malicious peer in a Denial of Service attack. OpenSSL version 1.1.1d, 1.1.1e, and 1.1.1f are affected by this issue. This issue did not affect OpenSSL versions prior to 1.1.1d. Fixed in OpenSSL 1.1.1g (Affected 1.1.1d-1.1.1f).

Las aplicaciones de Servidor o Cliente que llaman a la función SSL_check_chain() durante o después del protocolo de enlace de TLS versión 1.3, puede bloquear debido a una desreferencia del puntero NULL como resultado de un manejo incorrecto de la extensión TLS "signature_algorithms_cert". El bloqueo ocurre si se recibe un algoritmo de firma no comprobada o ni reconocido del peer. Esto podría ser explotado por un peer malicioso en un ataque de Denegación de Servicio. OpenSSL versiones 1.1.1d, 1.1.1e y 1.1.1f están afectadas por este problema. Este problema no afectaba a OpenSSL versiones anteriores a la versión 1.1.1d. Corregido en OpenSSL versión 1.1.1g (Afectado en la versión 1.1.1d-1.1.1f).

*Credits: Bernd Edlinger

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2019-12-03 CVE Reserved
2020-04-21 CVE Published
2024-03-12 EPSS Updated
2024-09-17 CVE Updated
2024-09-17 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-476: NULL Pointer Dereference

CAPEC

References (32)

URL	Tag	Source
http://packetstormsecurity.com/files/157527/OpenSSL-signature_algorithms_cert-Denial-Of-Service.html	Third Party Advisory
http://seclists.org/fulldisclosure/2020/May/5	Mailing List
http://www.openwall.com/lists/oss-security/2020/04/22/2	Mailing List
https://git.openssl.org/gitweb/?p=openssl.git%3Ba=commitdiff%3Bh=eb563247aef3e83dda7679c43f9649270462e5b1	X_refsource_confirm
https://kb.pulsesecure.net/articles/Pulse_Security_Advisories/SA44440	Third Party Advisory
https://lists.apache.org/thread.html/r66ea9c436da150683432db5fbc8beb8ae01886c6459ac30c2cea7345%40%3Cdev.tomcat.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r94d6ac3f010a38fccf4f432b12180a13fa1cf303559bd805648c9064%40%3Cdev.tomcat.apache.org%3E	Mailing List
https://lists.apache.org/thread.html/r9a41e304992ce6aec6585a87842b4f2e692604f5c892c37e3b0587ee%40%3Cdev.tomcat.apache.org%3E	Mailing List
https://security.netapp.com/advisory/ntap-20200424-0003	Third Party Advisory
https://security.netapp.com/advisory/ntap-20200717-0004	Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2020.html	Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_05	Third Party Advisory
https://www.synology.com/security/advisory/Synology_SA_20_05_OpenSSL	Third Party Advisory
https://www.tenable.com/security/tns-2020-03	Third Party Advisory
https://www.tenable.com/security/tns-2020-04	Third Party Advisory
https://www.tenable.com/security/tns-2020-11	Third Party Advisory
https://www.tenable.com/security/tns-2021-10	Third Party Advisory

URL	Date	SRC
https://github.com/irsl/CVE-2020-1967	2024-09-17

URL	Date	SRC
https://security.FreeBSD.org/advisories/FreeBSD-SA-20:11.openssl.asc	2023-11-07
https://www.oracle.com//security-alerts/cpujul2021.html	2023-11-07
https://www.oracle.com/security-alerts/cpuApr2021.html	2023-11-07
https://www.oracle.com/security-alerts/cpujan2021.html	2023-11-07
https://www.oracle.com/security-alerts/cpuoct2020.html	2023-11-07
https://www.oracle.com/security-alerts/cpuoct2021.html	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00004.html	2023-11-07
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00011.html	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DDHOAATPWJCXRNFMJ2SASDBBNU5RJONY	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXDDAOWSAIEFQNBHWYE6PPYFV4QXGMCD	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XVEP3LAK4JSPRXFO4QF4GG2IVXADV3SO	2023-11-07
https://security.gentoo.org/glsa/202004-10	2023-11-07
https://www.debian.org/security/2020/dsa-4661	2023-11-07
https://www.openssl.org/news/secadv/20200421.txt	2023-11-07

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Openssl Search vendor "Openssl"		Openssl Search vendor "Openssl" for product "Openssl"				>= 1.1.1d <= 1.1.1f Search vendor "Openssl" for product "Openssl" and version " >= 1.1.1d <= 1.1.1f"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				10.0 Search vendor "Debian" for product "Debian Linux" and version "10.0"		-		Affected
Freebsd Search vendor "Freebsd"		Freebsd Search vendor "Freebsd" for product "Freebsd"				12.1 Search vendor "Freebsd" for product "Freebsd" and version "12.1"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				30 Search vendor "Fedoraproject" for product "Fedora" and version "30"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				31 Search vendor "Fedoraproject" for product "Fedora" and version "31"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				32 Search vendor "Fedoraproject" for product "Fedora" and version "32"		-		Affected
Oracle Search vendor "Oracle"		Application Server Search vendor "Oracle" for product "Application Server"				12.1.3 Search vendor "Oracle" for product "Application Server" and version "12.1.3"		-		Affected
Oracle Search vendor "Oracle"		Enterprise Manager Base Platform Search vendor "Oracle" for product "Enterprise Manager Base Platform"				13.4.0.0 Search vendor "Oracle" for product "Enterprise Manager Base Platform" and version "13.4.0.0"		-		Affected
Oracle Search vendor "Oracle"		Enterprise Manager For Storage Management Search vendor "Oracle" for product "Enterprise Manager For Storage Management"				13.3.0.0 Search vendor "Oracle" for product "Enterprise Manager For Storage Management" and version "13.3.0.0"		-		Affected
Oracle Search vendor "Oracle"		Enterprise Manager For Storage Management Search vendor "Oracle" for product "Enterprise Manager For Storage Management"				13.4.0.0 Search vendor "Oracle" for product "Enterprise Manager For Storage Management" and version "13.4.0.0"		-		Affected
Oracle Search vendor "Oracle"		Enterprise Manager Ops Center Search vendor "Oracle" for product "Enterprise Manager Ops Center"				12.4.0 Search vendor "Oracle" for product "Enterprise Manager Ops Center" and version "12.4.0"		-		Affected
Oracle Search vendor "Oracle"		Http Server Search vendor "Oracle" for product "Http Server"				12.2.1.4.0 Search vendor "Oracle" for product "Http Server" and version "12.2.1.4.0"		-		Affected
Oracle Search vendor "Oracle"		Jd Edwards World Security Search vendor "Oracle" for product "Jd Edwards World Security"				a9.4 Search vendor "Oracle" for product "Jd Edwards World Security" and version "a9.4"		-		Affected
Oracle Search vendor "Oracle"		Mysql Search vendor "Oracle" for product "Mysql"				<= 5.6.48 Search vendor "Oracle" for product "Mysql" and version " <= 5.6.48"		-		Affected
Oracle Search vendor "Oracle"		Mysql Search vendor "Oracle" for product "Mysql"				>= 5.7.0 <= 5.7.30 Search vendor "Oracle" for product "Mysql" and version " >= 5.7.0 <= 5.7.30"		-		Affected
Oracle Search vendor "Oracle"		Mysql Search vendor "Oracle" for product "Mysql"				>= 8.0.0 <= 8.0.20 Search vendor "Oracle" for product "Mysql" and version " >= 8.0.0 <= 8.0.20"		-		Affected
Oracle Search vendor "Oracle"		Mysql Connectors Search vendor "Oracle" for product "Mysql Connectors"				<= 8.0.20 Search vendor "Oracle" for product "Mysql Connectors" and version " <= 8.0.20"		-		Affected
Oracle Search vendor "Oracle"		Mysql Enterprise Monitor Search vendor "Oracle" for product "Mysql Enterprise Monitor"				<= 4.0.12 Search vendor "Oracle" for product "Mysql Enterprise Monitor" and version " <= 4.0.12"		-		Affected
Oracle Search vendor "Oracle"		Mysql Enterprise Monitor Search vendor "Oracle" for product "Mysql Enterprise Monitor"				>= 8.0.0 <= 8.0.20 Search vendor "Oracle" for product "Mysql Enterprise Monitor" and version " >= 8.0.0 <= 8.0.20"		-		Affected
Oracle Search vendor "Oracle"		Mysql Workbench Search vendor "Oracle" for product "Mysql Workbench"				<= 8.0.21 Search vendor "Oracle" for product "Mysql Workbench" and version " <= 8.0.21"		-		Affected
Oracle Search vendor "Oracle"		Peoplesoft Enterprise Peopletools Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools"				8.56 Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools" and version "8.56"		-		Affected
Oracle Search vendor "Oracle"		Peoplesoft Enterprise Peopletools Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools"				8.57 Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools" and version "8.57"		-		Affected
Oracle Search vendor "Oracle"		Peoplesoft Enterprise Peopletools Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools"				8.58 Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools" and version "8.58"		-		Affected
Oracle Search vendor "Oracle"		Peoplesoft Enterprise Peopletools Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools"				8.59 Search vendor "Oracle" for product "Peoplesoft Enterprise Peopletools" and version "8.59"		-		Affected
Netapp Search vendor "Netapp"		Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager"				>= 7.3 Search vendor "Netapp" for product "Active Iq Unified Manager" and version " >= 7.3"		windows		Affected
Netapp Search vendor "Netapp"		Active Iq Unified Manager Search vendor "Netapp" for product "Active Iq Unified Manager"				>= 9.5 Search vendor "Netapp" for product "Active Iq Unified Manager" and version " >= 9.5"		vmware_vsphere		Affected
Netapp Search vendor "Netapp"		E-series Performance Analyzer Search vendor "Netapp" for product "E-series Performance Analyzer"				-		-		Affected
Netapp Search vendor "Netapp"		Oncommand Insight Search vendor "Netapp" for product "Oncommand Insight"				-		-		Affected
Netapp Search vendor "Netapp"		Oncommand Workflow Automation Search vendor "Netapp" for product "Oncommand Workflow Automation"				-		-		Affected
Netapp Search vendor "Netapp"		Smi-s Provider Search vendor "Netapp" for product "Smi-s Provider"				-		-		Affected
Netapp Search vendor "Netapp"		Snapcenter Search vendor "Netapp" for product "Snapcenter"				-		-		Affected
Netapp Search vendor "Netapp"		Steelstore Cloud Integrated Storage Search vendor "Netapp" for product "Steelstore Cloud Integrated Storage"				-		-		Affected
Broadcom Search vendor "Broadcom"		Fabric Operating System Search vendor "Broadcom" for product "Fabric Operating System"				-		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.1 Search vendor "Opensuse" for product "Leap" and version "15.1"		-		Affected
Opensuse Search vendor "Opensuse"		Leap Search vendor "Opensuse" for product "Leap"				15.2 Search vendor "Opensuse" for product "Leap" and version "15.2"		-		Affected
Jdedwards Search vendor "Jdedwards"		Enterpriseone Search vendor "Jdedwards" for product "Enterpriseone"				< 9.2.5.0 Search vendor "Jdedwards" for product "Enterpriseone" and version " < 9.2.5.0"		-		Affected
Tenable Search vendor "Tenable"		Log Correlation Engine Search vendor "Tenable" for product "Log Correlation Engine"				< 6.0.9 Search vendor "Tenable" for product "Log Correlation Engine" and version " < 6.0.9"		-		Affected