Vulnerability Report

CVE-2023-2640

Title: Privilege Escalation via overlayfs in Ubuntu Kernels

Privilege Escalation

Proof Of Concept

PoC Available for CVE-2023-2640

CWE Category CWE-863
Published Date Jul 26, 2023
Modified Date Nov 21, 2024
Exploit Status Available
Score 7.8 CVSS v3.1
Exploit Probability (EPSS)
15.78%

Vulnerability Summary

CVE-2023-2640: On Ubuntu kernels carrying both c914c0e27eb0 and "UBUNTU: SAUCE: overlayfs: Skip permission checking for trusted.overlayfs.* xattrs", an unprivileged user may set privileged extended attributes on the mounted files, leading them to be set on the upper files without the appropriate security checks.

Impacted Vendors

U
ubuntu 1
C
canonical 1

Reference Links

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640 https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html https://ubuntu.com/security/notices/USN-6250-1 https://wiz.io/blog/ubuntu-overlayfs-vulnerability https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-2640 https://lists.ubuntu.com/archives/kernel-team/2023-July/140923.html https://ubuntu.com/security/notices/USN-6250-1 https://wiz.io/blog/ubuntu-overlayfs-vulnerability
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.8
Attack Vector
LOCAL
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS v3.1
Source Entity [email protected]
Severity HIGH
7.8
Attack Vector
LOCAL
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
UNCHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2023-2640 Exploits & PoCs (Proof Of Concept)

GitHub https://github.com/g1vi/CVE-2023-2640-CVE-2023-32629
View Code
GitHub https://github.com/ThrynSec/CVE-2023-32629-CVE-2023-2640---POC-Escalation
View Code
GitHub https://github.com/luanoliveira350/GameOverlayFS
View Code
MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Stack

No specific products linked.