CVE-2020-13962

qt5: incorrectly calls SSL_shutdown() in OpenSSL mid-handshake causing denial of service in TLS applications

Severity Score

7.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Qt 5.12.2 through 5.14.2, as used in unofficial builds of Mumble 1.3.0 and other products, mishandles OpenSSL's error queue, which can cause a denial of service to QSslSocket users. Because errors leak in unrelated TLS sessions, an unrelated session may be disconnected when any handshake fails. (Mumble 1.3.1 is not affected, regardless of the Qt version.)

Qt versiones 5.12.2 hasta 5.14.2, como es usado en compilaciones no oficiales de Mumble versión 1.3.0 y otros productos, maneja inapropiadamente la cola de errores de OpenSSL, lo que puede ser capaz de causar una denegación de servicio a usuarios de QSslSocket. Debido a que los errores se filtran en sesiones TLS no relacionadas, una sesión no relacionada puede ser desconectada cuando se comete un fallo en cualquier protocolo de enlace. (Mumble versión 1.3.1 no está afectado, independientemente de la versión Qt)

*Credits: N/A

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

2020-06-08 CVE Reserved
2020-06-08 CVE Published
2024-05-15 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-391: Unchecked Error Condition

CAPEC

References (10)

URL	Tag	Source

URL	Date	SRC
https://github.com/mumble-voip/mumble/issues/3679	2024-08-04

URL	Date	SRC
https://github.com/mumble-voip/mumble/pull/4032	2023-11-07

URL	Date	SRC
http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00004.html	2023-11-07
https://bugreports.qt.io/browse/QTBUG-83450	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4X6EDPIIAQPVP2CHL2CHDHJ25EECA7UE	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UQJDBZUYMMF4R5QQKD2HTIKQU2NSKO63	2023-11-07
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3IZY7LKJ6NAXQDFYFR4S7L5BBHYK53K	2023-11-07
https://security.gentoo.org/glsa/202007-18	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-13962	2020-11-04
https://bugzilla.redhat.com/show_bug.cgi?id=1849734	2020-11-04

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Mumble Search vendor "Mumble"		Mumble Search vendor "Mumble" for product "Mumble"				1.3.0 Search vendor "Mumble" for product "Mumble" and version "1.3.0"		-		Affected
Qt Search vendor "Qt"		Qt Search vendor "Qt" for product "Qt"				>= 5.12.2 < 5.12.9 Search vendor "Qt" for product "Qt" and version " >= 5.12.2 < 5.12.9"		-		Affected
Qt Search vendor "Qt"		Qt Search vendor "Qt" for product "Qt"				>= 5.13.0 <= 5.13.2 Search vendor "Qt" for product "Qt" and version " >= 5.13.0 <= 5.13.2"		-		Affected
Qt Search vendor "Qt"		Qt Search vendor "Qt" for product "Qt"				>= 5.14.0 <= 5.14.2 Search vendor "Qt" for product "Qt" and version " >= 5.14.0 <= 5.14.2"		-		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
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		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