CVE-2021-42739

kernel: Heap buffer overflow in firedtv driver

Severity Score

6.7

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The firewire subsystem in the Linux kernel through 5.14.13 has a buffer overflow related to drivers/media/firewire/firedtv-avc.c and drivers/media/firewire/firedtv-ci.c, because avc_ca_pmt mishandles bounds checking.

Se ha encontrado un fallo de desbordamiento de búfer basado en la pila en el controlador de la tarjeta multimedia FireDTV del kernel de Linux, donde el usuario llama al ioctl CA_SEND_MSG. Este fallo permite a un usuario local de la máquina anfitriona bloquear el sistema o escalar privilegios en el sistema. La mayor amenaza de esta vulnerabilidad es para la confidencialidad, la integridad y la disponibilidad del sistema

A heap-based buffer overflow flaw was found in the Linux kernel FireDTV media card driver, where the user calls the CA_SEND_MSG ioctl. This flaw allows a local user of the host machine to crash the system or escalate privileges on the system. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Partial

Integrity

Partial

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2021-10-20 CVE Reserved
2021-10-20 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787: Out-of-bounds Write

CAPEC

References (7)

URL	Tag	Source
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=35d2969ea3c7d32aee78066b1f3cf61a0d935a4e
https://lore.kernel.org/linux-media/YHaulytonFcW+lyZ%40mwanda
https://seclists.org/oss-sec/2021/q2/46
https://www.starwindsoftware.com/security/sw-20220804-0001	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://www.oracle.com/security-alerts/cpujul2022.html	2024-03-24

URL	Date	SRC
https://bugzilla.redhat.com/show_bug.cgi?id=1951739	2022-05-10
https://access.redhat.com/security/cve/CVE-2021-42739	2022-05-10

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				<= 5.14.13 Search vendor "Linux" for product "Linux Kernel" and version " <= 5.14.13"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				34 Search vendor "Fedoraproject" for product "Fedora" and version "34"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				35 Search vendor "Fedoraproject" for product "Fedora" and version "35"		-		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
Starwindsoftware Search vendor "Starwindsoftware"		Starwind San \& Nas Search vendor "Starwindsoftware" for product "Starwind San \& Nas"				v8r12 Search vendor "Starwindsoftware" for product "Starwind San \& Nas" and version "v8r12"		-		Affected
Starwindsoftware Search vendor "Starwindsoftware"		Starwind Virtual San Search vendor "Starwindsoftware" for product "Starwind Virtual San"				v8r13 Search vendor "Starwindsoftware" for product "Starwind Virtual San" and version "v8r13"		14338		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Binding Support Function Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function"				22.1.3 Search vendor "Oracle" for product "Communications Cloud Native Core Binding Support Function" and version "22.1.3"		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Network Exposure Function Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function"				22.1.1 Search vendor "Oracle" for product "Communications Cloud Native Core Network Exposure Function" and version "22.1.1"		-		Affected
Oracle Search vendor "Oracle"		Communications Cloud Native Core Policy Search vendor "Oracle" for product "Communications Cloud Native Core Policy"				22.2.0 Search vendor "Oracle" for product "Communications Cloud Native Core Policy" and version "22.2.0"		-		Affected