Linux Kernel up to 4.17.11 RBX entry_64.S 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, which was classified as critical, has been found in Linux Kernel up to 4.17.11. The impacted element is an unknown function of the file arch/x86/entry/entry_64.S of the component RBX Handler. This manipulation causes access control. This vulnerability is registered as CVE-2018-14678. The attack needs to be launched locally. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 4.17.11 (Operating System) and classified as critical. Affected by this vulnerability is an unknown functionality of the file arch/x86/entry/entry_64.S of the component RBX Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered in the Linux kernel through 4.17.11, as used in Xen through 4.11.x. The xen_failsafe_callback entry point in arch/x86/entry/entry_64.S does not properly maintain RBX, which allows local users to cause a denial of service (uninitialized memory usage and system crash). Within Xen, 64-bit x86 PV Linux guest OS users can trigger a guest OS crash or possibly gain privileges.

The bug was discovered 07/25/2018. The weakness was published 07/28/2018 (Website). The advisory is shared at securityfocus.com. This vulnerability is known as CVE-2018-14678 since 07/28/2018. An attack has to be approached locally. The successful exploitation needs a single authentication. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 3 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 111539 (Fedora 27 : kernel / kernel-headers (2018-49bda79bd5)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Fedora Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157818 (Oracle Enterprise Linux Security Update for Unbreakable Enterprise kernel (ELSA-2018-4242)).

Upgrading eliminates this vulnerability. A possible mitigation has been published 7 days after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (111539) and SecurityFocus (BID 104924†). Similar entry is available at VDB-120148. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Linux Kernel up to up to 4.17.11
  • Xen up to 4.11.x

Productinfo

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Website

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

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Access control
CWE: CWE-264
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: 111539
Nessus Name: Fedora 27 : kernel / kernel-headers (2018-49bda79bd5)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

07/25/2018 🔍
07/25/2018 +0 days 🔍
07/28/2018 +2 days 🔍
07/28/2018 +0 days 🔍
07/28/2018 +0 days 🔍
07/29/2018 +1 days 🔍
08/03/2018 +5 days 🔍
08/06/2018 +3 days 🔍
04/27/2023 +1725 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2018-49bda79bd5⛔
Status: Confirmed

CVE: CVE-2018-14678 (🔍)
GCVE (CVE): GCVE-0-2018-14678
GCVE (VulDB): GCVE-100-122305

OVAL: 🔍

SecurityFocus: 104924 - Linux Kernel CVE-2018-14678 Local Denial of Service Vulnerability
SecurityTracker: 1041397

See also: 🔍

Entryinfo

Created: 07/29/2018 12:17
Updated: 04/27/2023 15:35
Changes: 07/29/2018 12:17 (79), 03/11/2020 08:33 (5), 04/27/2023 15:29 (5), 04/27/2023 15:35 (1)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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