CVE-2023-4194

Kernel: tap: tap_open(): correctly initialize socket uid next fix of i_uid to current_fsuid

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

A flaw was found in the Linux kernel's TUN/TAP functionality. This issue could allow a local user to bypass network filters and gain unauthorized access to some resources. The original patches fixing CVE-2023-1076 are incorrect or incomplete. The problem is that the following upstream commits - a096ccca6e50 ("tun: tun_chr_open(): correctly initialize socket uid"), - 66b2c338adce ("tap: tap_open(): correctly initialize socket uid"), pass "inode->i_uid" to sock_init_data_uid() as the last parameter and that turns out to not be accurate.

Se ha encontrado un fallo en la funcionalidad TUN/TAP del kernel de Linux. Este problema podría permitir a un usuario local eludir los filtros de red y obtener acceso no autorizado a algunos recursos. Los parches originales que solucionan CVE-2023-1076 son incorrectos o incompletos. El problema es que los siguientes commits upstream - a096ccca6e50 ("tun: tun_chr_open(): inicializar correctamente el uid del socket"), - 66b2c338adce ("tap: tap_open(): inicializar correctamente el uid del socket"), pasan "inode->i_uid" a sock_init_data_uid() como último parámetro y resulta que no es correcto.

*Credits: This issue was discovered by Laszlo Ersek (Red Hat).

CVSS Scores

NISTv3.1 5.5

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-08-06 CVE Reserved
2023-08-07 CVE Published
2023-08-08 EPSS Updated
2024-09-16 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-843: Access of Resource Using Incompatible Type ('Type Confusion')
CWE-863: Incorrect Authorization

CAPEC

References (12)

URL	Tag	Source
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html	Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/344H6HO6SSC4KT7PDFXSDIXKMKHISSGF	Mailing List
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3TYLSJ2SAI7RF56ZLQ5CQWCJLVJSD73Q	Mailing List
https://security.netapp.com/advisory/ntap-20231027-0002	Third Party Advisory
https://www.debian.org/security/2023/dsa-5480	Third Party Advisory
https://www.debian.org/security/2023/dsa-5492	Third Party Advisory

URL	Date	SRC

URL	Date	SRC
https://lore.kernel.org/all/20230731164237.48365-1-lersek@redhat.com	2023-11-07
https://lore.kernel.org/all/20230731164237.48365-2-lersek@redhat.com	2023-11-07
https://lore.kernel.org/all/20230731164237.48365-3-lersek@redhat.com	2023-11-07

URL	Date	SRC
https://access.redhat.com/errata/RHSA-2023:6583	2024-05-08
https://access.redhat.com/security/cve/CVE-2023-4194	2023-11-07
https://bugzilla.redhat.com/show_bug.cgi?id=2229498	2023-11-07

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"				<= 6.4 Search vendor "Linux" for product "Linux Kernel" and version " <= 6.4"		-		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				6.5 Search vendor "Linux" for product "Linux Kernel" and version "6.5"		rc1		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				6.5 Search vendor "Linux" for product "Linux Kernel" and version "6.5"		rc2		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				6.5 Search vendor "Linux" for product "Linux Kernel" and version "6.5"		rc3		Affected
Linux Search vendor "Linux"		Linux Kernel Search vendor "Linux" for product "Linux Kernel"				6.5 Search vendor "Linux" for product "Linux Kernel" and version "6.5"		rc4		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				8.0 Search vendor "Redhat" for product "Enterprise Linux" and version "8.0"		-		Affected
Redhat Search vendor "Redhat"		Enterprise Linux Search vendor "Redhat" for product "Enterprise Linux"				9.0 Search vendor "Redhat" for product "Enterprise Linux" and version "9.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				37 Search vendor "Fedoraproject" for product "Fedora" and version "37"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				38 Search vendor "Fedoraproject" for product "Fedora" and version "38"		-		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
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				11.0 Search vendor "Debian" for product "Debian Linux" and version "11.0"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				12.0 Search vendor "Debian" for product "Debian Linux" and version "12.0"		-		Affected