Mozilla Firefox up to 62.0.2 Javascript type conversion

CVSS Meta Temp Score
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CTI Interest Score
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7.0$0-$5k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 62.0.2. It has been rated as critical. The affected element is an unknown function of the component Javascript. Performing a manipulation results in type conversion. This vulnerability is cataloged as CVE-2018-12386. It is possible to initiate the attack remotely. There is no exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, was found in Mozilla Firefox up to 62.0.2 (Web Browser). This affects an unknown function of the component Javascript. The manipulation with an unknown input leads to a type conversion vulnerability. CWE is classifying the issue as CWE-704. The product does not correctly convert an object, resource, or structure from one type to a different type. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

A vulnerability in register allocation in JavaScript can lead to type confusion, allowing for an arbitrary read and write. This leads to remote code execution inside the sandboxed content process when triggered. This vulnerability affects Firefox ESR < 60.2.2 and Firefox < 62.0.3.

The bug was discovered 10/02/2018. The weakness was shared 10/18/2018 as Bug 1493900 as confirmed bug report (Bugzilla). The advisory is shared at bugzilla.mozilla.org. This vulnerability is uniquely identified as CVE-2018-12386 since 06/14/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 117894 (GLSA-201810-01 : Mozilla Firefox: Multiple vulnerabilities), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Gentoo Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 157814 (Oracle Enterprise Linux Security Update for firefox (ELSA-2018-2884)).

Upgrading to version 62.0.3 eliminates this vulnerability. A possible mitigation has been published before and not just after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (117894) and SecurityFocus (BID 105460†). The entries VDB-120051, VDB-120053, VDB-120058 and VDB-120059 are related to this item. 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: 7.2
VulDB Meta Temp Score: 7.0

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

NVD Base Score: 8.1
NVD Vector: 🔍

CVSSv2info

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

NVD Base Score: 🔍

Exploitinginfo

Class: Type conversion
CWE: CWE-704
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 117894
Nessus Name: GLSA-201810-01 : Mozilla Firefox: Multiple vulnerabilities
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox 62.0.3

Timelineinfo

06/14/2018 🔍
10/02/2018 +110 days 🔍
10/02/2018 +0 days 🔍
10/02/2018 +0 days 🔍
10/03/2018 +1 days 🔍
10/18/2018 +14 days 🔍
10/18/2018 +0 days 🔍
10/19/2018 +1 days 🔍
11/26/2025 +2595 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: Bug 1493900
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-12386 (🔍)
GCVE (CVE): GCVE-0-2018-12386
GCVE (VulDB): GCVE-100-125769

OVAL: 🔍

SecurityFocus: 105460 - Mozilla Firefox and Firefox ESR Remote Code Execution and Information Disclosure Vulnerabilities
SecurityTracker: 1041770

See also: 🔍

Entryinfo

Created: 10/19/2018 06:47
Updated: 11/26/2025 08:54
Changes: 10/19/2018 06:47 (76), 04/05/2020 14:20 (5), 05/30/2023 11:09 (4), 11/26/2025 08:54 (16)
Complete: 🔍
Cache ID: 216::103

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

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