Ubuntu Linux 18.10 UEFI Secure Boot kernel/module.c access control

CVSS Meta Temp Score
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CTI Interest Score
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6.4$0-$5k0.00

Summaryinfo

A vulnerability was found in Ubuntu Linux 18.10 and classified as critical. This issue affects some unknown processing of the file kernel/module.c of the component UEFI Secure Boot. The manipulation results in access control. This vulnerability is identified as CVE-2018-18653. The attack is only possible with local access. There is not any exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, was found in Ubuntu Linux 18.10 (Operating System). Affected is an unknown code of the file kernel/module.c of the component UEFI Secure Boot. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

The Linux kernel, as used in Ubuntu 18.10 and when booted with UEFI Secure Boot enabled, allows privileged local users to bypass intended Secure Boot restrictions and execute untrusted code by loading arbitrary kernel modules. This occurs because a modified kernel/module.c, in conjunction with certain configuration options, leads to mishandling of the result of signature verification.

The bug was discovered 10/19/2018. The weakness was released 10/26/2018 (Website). The advisory is shared for download at launchpad.net. This vulnerability is traded as CVE-2018-18653 since 10/25/2018. The attack needs to be approached locally. A authentication is needed for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1068.

The vulnerability was handled as a non-public zero-day exploit for at least 6 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 119302 (Ubuntu 18.10 : linux-aws vulnerabilities (USN-3832-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197316 (Ubuntu Security Notification for Linux-aws Vulnerabilities (USN-3832-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 2 months after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (119302) and SecurityFocus (BID 105525†). Entries connected to this vulnerability are available at VDB-124773, VDB-125740, VDB-126010 and VDB-126963. VulDB is the best source for vulnerability data and more expert information about this specific topic.

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.4

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Access control
CWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: No

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119302
Nessus Name: Ubuntu 18.10 : linux-aws vulnerabilities (USN-3832-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍

Timelineinfo

09/27/2018 🔍
10/19/2018 +22 days 🔍
10/25/2018 +5 days 🔍
10/25/2018 +0 days 🔍
10/26/2018 +0 days 🔍
10/26/2018 +0 days 🔍
11/30/2018 +35 days 🔍
11/30/2018 +0 days 🔍
06/03/2023 +1646 days 🔍

Sourcesinfo

Vendor: ubuntu.com

Advisory: USN-3832-1
Status: Confirmed

CVE: CVE-2018-18653 (🔍)
GCVE (CVE): GCVE-0-2018-18653
GCVE (VulDB): GCVE-100-125976
SecurityFocus: 105525 - Linux Kernel 'fs/proc/base.c' Local Information Disclosure Vulnerability

See also: 🔍

Entryinfo

Created: 10/26/2018 08:36
Updated: 06/03/2023 08:44
Changes: 10/26/2018 08:36 (76), 04/06/2020 18:47 (5), 06/03/2023 08:44 (4)
Complete: 🔍
Cache ID: 216::103

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