Microsoft Internet Explorer 9/10/11 Scripting Engine JScript.dll memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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7.0$5k-$25k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Microsoft Internet Explorer 9/10/11. This impacts an unknown function in the library JScript.dll of the component Scripting Engine. This manipulation causes memory corruption. This vulnerability is tracked as CVE-2018-8653. The attack is possible to be carried out remotely. Moreover, an exploit is present. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability has been found in Microsoft Internet Explorer 9/10/11 (Web Browser) and classified as critical. Affected by this vulnerability is some unknown functionality in the library JScript.dll of the component Scripting Engine. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability.

The bug was discovered 12/19/2018. The weakness was disclosed 12/19/2018 by Clement Lecigne with Google as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. The public release has been coordinated in cooperation with Microsoft. This vulnerability is known as CVE-2018-8653 since 03/14/2018. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details and also a private exploit are known. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 02/07/2025). It is expected to see the exploit prices for this product decreasing in the near future. The advisory points out:

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

It is declared as attacked. The vulnerability scanner Nessus provides a plugin with the ID 119770 (KB4483230: Windows 10 Version 1703 December 2018 OOB Security Update), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Windows : Microsoft Bulletins and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 100350 (Microsoft Internet Explorer Memory Corruption Remote Code Execution Vulnerability). The CISA Known Exploited Vulnerabilities Catalog lists this issue since 11/03/2021 with a due date of 05/03/2022:

Apply updates per vendor instructions.

Applying a patch is able to eliminate this problem. It is possible to mitigate the problem by applying the configuration setting cacls %windir%\syswow64\jscript.dll /E /P everyone:N. The best possible mitigation is suggested to be patching the affected component. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Zero-Day.cz (526), Tenable (119770) and SecurityFocus (BID 106255†). Additional details are provided at isc.sans.edu. 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: 7.1
VulDB Meta Temp Score: 7.0

VulDB Base Score: 6.3
VulDB Temp Score: 6.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 7.5
Vendor Vector (Microsoft): 🔍

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Private
Status: Attacked

EPSS Score: 🔍
EPSS Percentile: 🔍

KEV Added: 🔍
KEV Due: 🔍
KEV Remediation: 🔍
KEV Ransomware: 🔍
KEV Notice: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 119770
Nessus Name: KB4483230: Windows 10 Version 1703 December 2018 OOB Security Update
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Zero-Day.cz: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Config: cacls %windir%\syswow64\jscript.dll /E /P everyone:N

Timelineinfo

03/14/2018 🔍
12/19/2018 +280 days 🔍
12/19/2018 +0 days 🔍
12/19/2018 +0 days 🔍
12/19/2018 +0 days 🔍
12/19/2018 +0 days 🔍
12/20/2018 +1 days 🔍
12/20/2018 +0 days 🔍
02/07/2025 +2241 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: portal.msrc.microsoft.com
Researcher: Clement Lecigne
Organization: Google
Status: Confirmed
Confirmation: 🔍
Coordinated: 🔍

CVE: CVE-2018-8653 (🔍)
GCVE (CVE): GCVE-0-2018-8653
GCVE (VulDB): GCVE-100-128137
CERT: 🔍
SecurityFocus: 106255 - Microsoft Internet Explorer Scripting Engine CVE-2018-8653 Remote Memory Corruption Vulnerability

scip Labs: https://www.scip.ch/en/?labs.20161013
Misc.: 🔍

Entryinfo

Created: 12/20/2018 09:43
Updated: 02/07/2025 18:58
Changes: 12/20/2018 09:43 (95), 04/22/2020 09:37 (4), 06/20/2023 07:37 (4), 04/19/2024 12:42 (22), 07/04/2024 14:17 (2), 09/09/2024 22:29 (1), 02/07/2025 18:58 (1)
Complete: 🔍
Cache ID: 216::103

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

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