CVE-2023-28642

AppArmor bypass with symlinked /proc in runc

Severity Score

7.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

NVD
RedHat

runc is a CLI tool for spawning and running containers according to the OCI specification. It was found that AppArmor can be bypassed when `/proc` inside the container is symlinked with a specific mount configuration. This issue has been fixed in runc version 1.1.5, by prohibiting symlinked `/proc`. See PR #3785 for details. users are advised to upgrade. Users unable to upgrade should avoid using an untrusted container image.

A flaw was found in runc. This vulnerability could allow a remote attacker to bypass security restrictions and create a symbolic link inside a container to the /proc directory, bypassing AppArmor and SELinux protections.

*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

Privileges Required

None

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

Low

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2023-03-20 CVE Reserved
2023-03-29 CVE Published
2024-08-02 CVE Updated
2024-10-19 EPSS Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-59: Improper Link Resolution Before File Access ('Link Following')
CWE-281: Improper Preservation of Permissions
CWE-305: Authentication Bypass by Primary Weakness

CAPEC

References (4)

URL	Tag	Source

URL	Date	SRC

URL	Date	SRC
https://github.com/opencontainers/runc/pull/3785	2023-11-07
https://github.com/opencontainers/runc/security/advisories/GHSA-g2j6-57v7-gm8c	2023-11-07

URL	Date	SRC
https://access.redhat.com/security/cve/CVE-2023-28642	2024-01-30
https://bugzilla.redhat.com/show_bug.cgi?id=2182883	2024-01-30

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Linuxfoundation Search vendor "Linuxfoundation"		Runc Search vendor "Linuxfoundation" for product "Runc"				< 1.1.5 Search vendor "Linuxfoundation" for product "Runc" and version " < 1.1.5"		-		Affected