Local Privilege Escalation Vulnerability in Ubuntu Kernels
CVE-2023-32629

7.8HIGH

Key Information:

Vendor

Canonical

Vendor
CVE Published:
26 July 2023

Badges

👾 Exploit Exists🟡 Public PoC🟣 EPSS 58%📰 News Worthy

What is CVE-2023-32629?

The local privilege escalation vulnerability in the overlayfs implementation of Ubuntu Kernels allows attackers to bypass permission checks during certain attribute-setting operations. Specifically, when invoking 'ovl_do_setxattr', the requisite permission checks are skipped, potentially leading to unauthorized access and manipulation of system resources. This issue could be exploited by local users to gain elevated privileges, thereby compromising system integrity and security.

Affected Version(s)

Ubuntu Kernel Linux 0 < 6.2.0-26.26

Ubuntu Kernel Linux 0 < 6.0.0-1020.20

Ubuntu Kernel Linux 0 < 5.4.0-155.172

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

News Articles

GameOverlay Vulnerability Impacts 40% of Ubuntu Workloads | Wiz Blog

Wiz Research discovers CVE-2023-2640 & CVE-2023-32629, 2 privilege escalation vulnerabilities in Ubuntu's OverlayFS module impacting 40% of cloud workloads.

2 weeks ago

GameOver(lay): Two Severe Linux Vulnerabilities Impact 40% of Ubuntu Users

Cybersecurity researchers have uncovered high-severity flaws in the Ubuntu kernel, impacting 40% of users!

2 weeks ago

References

EPSS Score

58% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • 📰

    First article discovered by The Hacker News

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Shir Tamari
Sagi Tzadik
.