Linux Kernel up to 4.18.0 Indirect Call paravirt.c Spectre 7pk security

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 4.18.0. The affected element is an unknown function of the file arch/x86/kernel/paravirt.c of the component Indirect Call Handler. The manipulation leads to 7pk security (Spectre). This vulnerability is documented as CVE-2018-15594. The attack needs to be performed locally. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 4.18.0 (Operating System). This issue affects some unknown functionality of the file arch/x86/kernel/paravirt.c of the component Indirect Call Handler. The manipulation with an unknown input leads to a 7pk security vulnerability (Spectre). Using CWE to declare the problem leads to CWE-254. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

arch/x86/kernel/paravirt.c in the Linux kernel before 4.18.1 mishandles certain indirect calls, which makes it easier for attackers to conduct Spectre-v2 attacks against paravirtual guests.

The bug was discovered 08/07/2018. The weakness was released 08/20/2018 (Website). The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2018-15594 since 08/20/2018. The exploitation is known to be easy. An attack has to be approached locally. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1211 for this issue.

The vulnerability was handled as a non-public zero-day exploit for at least 13 days. During that time the estimated underground price was around $0-$5k. The vulnerability scanner Nessus provides a plugin with the ID 117862 (Debian DSA-4308-1 : linux - security update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Debian Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 390148 (Oracle VM Server for x86 Security Update for Unbreakable Enterprise kernel (OVMSA-2018-0253)).

Upgrading to version 4.18.1 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 (117862) and SecurityFocus (BID 105120†). Entries connected to this vulnerability are available at VDB-116098, VDB-119423, VDB-119915 and VDB-120206. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.4
VulDB Meta Temp Score: 5.3

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

NVD Base Score: 5.5
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

Name: Spectre
Class: 7pk security / Spectre
CWE: CWE-254
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: 117862
Nessus Name: Debian DSA-4308-1 : linux - security update
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: 🔍

Upgrade: Kernel 4.18.1
Patch: git.kernel.org

Timelineinfo

08/07/2018 🔍
08/15/2018 +8 days 🔍
08/20/2018 +4 days 🔍
08/20/2018 +0 days 🔍
08/20/2018 +0 days 🔍
08/20/2018 +0 days 🔍
10/01/2018 +42 days 🔍
10/02/2018 +1 days 🔍
05/02/2023 +1673 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: RHSA-2019:2029
Status: Confirmed

CVE: CVE-2018-15594 (🔍)
GCVE (CVE): GCVE-0-2018-15594
GCVE (VulDB): GCVE-100-123041

OVAL: 🔍

SecurityFocus: 105120 - Linux Kernel 'arch/x86/kernel/paravirt.c' Local Security Bypass Vulnerability
SecurityTracker: 1041601

See also: 🔍

Entryinfo

Created: 08/20/2018 13:14
Updated: 05/02/2023 14:49
Changes: 08/20/2018 13:14 (80), 03/16/2020 20:18 (4), 05/02/2023 14:49 (6)
Complete: 🔍
Cache ID: 216::103

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

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