#VU78674 Permissions, Privileges, and Access Controls in linux-image-6.2.0-1006-ibm (Ubuntu package) - CVE-2023-32629

Vulnerability identifier: #VU78674

Vulnerability risk: Low

CVSSv4.0: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Clear]

CVE-ID: CVE-2023-32629

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
linux-image-6.2.0-1006-ibm (Ubuntu package)
Operating systems & Components / Operating system package or component

Vendor: Canonical Ltd.

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to ovl_copy_up_meta_inode_data skips permission checks when calling ovl_do_setxattr on Ubuntu kernels. A local user can execute arbitrary code with elevated privileges.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

linux-image-6.2.0-1006-ibm (Ubuntu package): before 6.2.0-1006.6

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External links
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-32629
https://lists.ubuntu.com/archives/kernel-team/2023-July/140920.html
https://wiz.io/blog/ubuntu-overlayfs-vulnerability
https://ubuntu.com/security/notices/USN-6250-1

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, a fully functional exploit for this vulnerability is available.