Microsoft Edge Scripting Engine memory corruption

CVSS Meta Temp Score
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CTI Interest Score
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5.8$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Microsoft Edge. Affected by this issue is some unknown functionality of the component Scripting Engine. The manipulation leads to memory corruption. This vulnerability is referenced as CVE-2018-0769. Remote exploitation of the attack is possible. Furthermore, an exploit is available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Microsoft Edge (Web Browser) (affected version not known). It has been rated as critical. This issue affects some unknown functionality of the component Scripting Engine. The manipulation with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to 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. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Microsoft Edge in Windows 10 Gold, 1511, 1607, 1703, 1709, and Windows Server 2016 allows an attacker to execute arbitrary code in the context of the current user, due to how the scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2018-0758, CVE-2018-0762, CVE-2018-0768, CVE-2018-0770, CVE-2018-0772, CVE-2018-0773, CVE-2018-0774, CVE-2018-0775, CVE-2018-0776, CVE-2018-0777, CVE-2018-0778, and CVE-2018-0781.

The bug was discovered 01/03/2018. The weakness was published 01/03/2018 by lokihardt with Google Project Zero as confirmed security update guide (Website). The advisory is shared at portal.msrc.microsoft.com. The identification of this vulnerability is CVE-2018-0769 since 12/01/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Technical details are unknown but a public exploit is available. The advisory points out:

A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge. 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.

A public exploit has been developed by Google Security Research and been published 2 weeks after the advisory. The exploit is available at exploit-db.com. It is declared as proof-of-concept. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 105547 (KB4056888: Windows 10 Version 1511 January 2018 Security Update (Meltdown)(Spectre)), 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 91425 (Microsoft Edge Security Update for January 2018 (ADV180002) (Spectre/Meltdown)). The code used by the exploit is:

function opt(arr) {
    if (arr.length <= 15)
        return;
 
    let j = 0;
    for (let i = 0; i < 2; i++) {
        arr[j] = 0x1234;  // (a)
        j += 0x100000;
        j + 0x7ffffff0;
    }
}
 
function main() {
    for (let i = 0; i < 0x10000; i++) {
        opt(new Uint32Array(100));
    }
}
 
main();

Applying a patch is able to eliminate this problem. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Exploit-DB (43710), Tenable (105547) and SecurityFocus (BID 102396†). Similar entries are available at VDB-111349, VDB-111351, VDB-111352 and VDB-111353. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.0
VulDB Meta Temp Score: 5.8

VulDB Base Score: 6.3
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

Vendor Base Score (Microsoft): 4.2
Vendor Vector (Microsoft): 🔍

NVD Base Score: 7.5
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

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: Google Security Research
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 105547
Nessus Name: KB4056888: Windows 10 Version 1511 January 2018 Security Update (Meltdown)(Spectre)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 870324
OpenVAS Name: Microsoft Windows Multiple Vulnerabilities (KB4056892)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Exploit-DB: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

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

Timelineinfo

12/01/2017 🔍
01/03/2018 +33 days 🔍
01/03/2018 +0 days 🔍
01/03/2018 +0 days 🔍
01/03/2018 +0 days 🔍
01/04/2018 +1 days 🔍
01/04/2018 +0 days 🔍
01/05/2018 +1 days 🔍
01/17/2018 +12 days 🔍
01/17/2018 +0 days 🔍
09/10/2025 +2793 days 🔍

Sourcesinfo

Vendor: microsoft.com

Advisory: portal.msrc.microsoft.com
Researcher: Lokihardt (lokihardt)
Organization: Google Project Zero
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-0769 (🔍)
GCVE (CVE): GCVE-0-2018-0769
GCVE (VulDB): GCVE-100-111365

OVAL: 🔍

SecurityFocus: 102396 - Microsoft Edge Scripting Engine CVE-2018-0769 Remote Memory Corruption Vulnerability
SecurityTracker: 1040100

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

Entryinfo

Created: 01/05/2018 10:04
Updated: 09/10/2025 04:03
Changes: 01/05/2018 10:04 (95), 12/28/2019 16:47 (6), 01/28/2021 15:02 (2), 01/28/2021 15:08 (1), 09/10/2025 04:03 (15)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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