Mozilla Firefox up to 63.x WebExtension Content Script permission

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 63.x. It has been rated as critical. Impacted is an unknown function of the component WebExtension Content Script Handler. This manipulation causes permission. This vulnerability is tracked as CVE-2018-18495. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as critical was found in Mozilla Firefox up to 63.x (Web Browser). Affected by this vulnerability is an unknown function of the component WebExtension Content Script Handler. The manipulation with an unknown input leads to a permission vulnerability. The CWE definition for the vulnerability is CWE-275. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

WebExtension content scripts can be loaded into about: pages in some circumstances, in violation of the permissions granted to extensions. This could allow an extension to interfere with the loading and usage of these pages and use capabilities that were intended to be restricted from extensions. This vulnerability affects Firefox < 64.

The bug was discovered 12/11/2018. The weakness was disclosed 02/28/2019 by Samuel Gross (xisigr) as Bug 1427585 as confirmed bug report (Bugzilla). The advisory is shared at bugzilla.mozilla.org. This vulnerability is known as CVE-2018-18495 since 10/19/2018. 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. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1222 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 119654 (Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : firefox vulnerabilities (USN-3844-1)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Ubuntu Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 197328 (Ubuntu Security Notification for Firefox Vulnerabilities (USN-3844-1)).

Upgrading 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 (119654) and SecurityFocus (BID 105666†). The entries VDB-126808, VDB-126809, VDB-126810 and VDB-126811 are pretty similar. 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: 6.4
VulDB Meta Temp Score: 6.2

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

NVD Base Score: 6.5
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: Permission
CWE: CWE-275 / CWE-266
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: 119654
Nessus Name: Ubuntu 14.04 LTS / 16.04 LTS / 18.04 LTS / 18.10 : firefox vulnerabilities (USN-3844-1)
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: 🔍

Timelineinfo

10/16/2018 🔍
10/19/2018 +3 days 🔍
12/11/2018 +53 days 🔍
12/11/2018 +0 days 🔍
12/13/2018 +2 days 🔍
02/28/2019 +77 days 🔍
03/01/2019 +1 days 🔍
05/13/2020 +439 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: Bug 1427585
Researcher: Samuel Gross (xisigr)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2018-18495 (🔍)
GCVE (CVE): GCVE-0-2018-18495
GCVE (VulDB): GCVE-100-131257
SecurityFocus: 105666 - Google Chrome Prior to 70.0.3538.67 Multiple Security Vulnerabilities

See also: 🔍

Entryinfo

Created: 03/01/2019 06:27
Updated: 05/13/2020 10:26
Changes: 03/01/2019 06:27 (75), 05/13/2020 10:26 (6)
Complete: 🔍
Cache ID: 216::103

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

Discussion

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