Ubuntu Linux 18.10 UEFI Secure Boot kernel/module.c access control
CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
6.4 | $0-$5k | 0.00 |
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 vulnerability database at Tenable (119302). Entries connected to this vulnerability are available at 124773, 125740, 126010 and 126963.
Product
Type
Vendor
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 6.5VulDB 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: 🔍
CVSSv2
AV | AC | Au | C | I | A |
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Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
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unlock | unlock | unlock | unlock | unlock | unlock |
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VulDB Base Score: 🔍
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Exploiting
Class: Access controlCWE: CWE-284 / CWE-266
CAPEC: 🔍
ATT&CK: 🔍
Local: Yes
Remote: No
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
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Today | unlock | unlock | unlock | unlock |
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 Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Timeline
09/27/2018 🔍10/19/2018 🔍
10/25/2018 🔍
10/25/2018 🔍
10/26/2018 🔍
10/26/2018 🔍
11/30/2018 🔍
11/30/2018 🔍
06/03/2023 🔍
Sources
Vendor: ubuntu.comAdvisory: USN-3832-1
Status: Confirmed
CVE: CVE-2018-18653 (🔍)
SecurityFocus: 105525 - Linux Kernel 'fs/proc/base.c' Local Information Disclosure Vulnerability
See also: 🔍
Entry
Created: 10/26/2018 08:36Updated: 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: 🔍
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