CVE-2021-33033

kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The Linux kernel before 5.11.14 has a use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c because the CIPSO and CALIPSO refcounting for the DOI definitions is mishandled, aka CID-ad5d07f4a9cd. This leads to writing an arbitrary value.

El kernel de Linux versiones anteriores a 5.11.14, presenta un uso de la memoria previamente liberada en una función cipso_v4_genopt en el archivo net/ipv4/cipso_ipv4.c, porque el recuento de CIPSO y CALIPSO para las definiciones DOI es manejado inapropiadamente, también se conoce como CID-ad5d07f4a9cd. Esto conlleva a escribir un valor arbitrario

A flaw use-after-free in the Linux kernel CIPSO network packet labeling protocol functionality was found in the way user open local network connection with the usage of the security labeling that is IP option number 134. A local user could use this flaw to crash the system or possibly escalate their privileges on the system.

*Credits: N/A

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

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

2021-05-14 CVE Reserved
2021-05-14 CVE Published
2024-08-03 CVE Updated
2024-08-03 First Exploit
2024-09-16 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-416: Use After Free

CAPEC

References (8)

URL	Tag	Source

URL	Date	SRC
https://sites.google.com/view/syzscope/kasan-use-after-free-read-in-cipso_v4_genopt	2024-08-03
https://syzkaller.appspot.com/bug?id=96e7d345748d8814901c91cd92084ed04b46701e	2024-08-03

URL	Date	SRC
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.14	2021-06-09
https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.7	2021-06-09
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1165affd484889d4986cf3b724318935a0b120d8	2021-06-09
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ad5d07f4a9cd671233ae20983848874731102c08	2021-06-09

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2021-33033	2021-11-09
https://bugzilla.redhat.com/show_bug.cgi?id=1961300	2021-11-09

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"				< 5.11.14 Search vendor "Linux" for product "Linux Kernel" and version " < 5.11.14"		-		Affected