Mozilla Firefox up to 94.x on Android Address Bar cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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4.1$0-$5k0.00

A vulnerability classified as problematic has been found in Mozilla Firefox up to 94.x on Android (Web Browser). Affected is an unknown function of the component Address Bar Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. This is going to have an impact on integrity. An attacker might be able to inject arbitrary html and script code into the web site. This would alter the appearance and would make it possible to initiate further attacks against site visitors. CVE summarizes:

When receiving a URL through a SEND intent, Firefox would have searched for the text, but subsequent usages of the address bar might have caused the URL to load unintentionally, which could lead to XSS and spoofing attacks. *This bug only affects Firefox for Android. Other operating systems are unaffected.*. This vulnerability affects Firefox < 95.

The weakness was released 12/09/2021. The advisory is available at mozilla.org. This vulnerability is traded as CVE-2021-43544 since 11/08/2021. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. The technical details are unknown and an exploit is not available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 12/12/2021). This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

Upgrading to version 95.0 eliminates this vulnerability. The upgrade is hosted for download at mozilla.org.

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VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.1

VulDB Base Score: 4.3
VulDB Temp Score: 4.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

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

Exploitinginfoedit

Class: Cross site scripting
CWE: CWE-79
ATT&CK: T1059.007

Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Firefox 95.0

Timelineinfoedit

11/08/2021 CVE assigned
12/09/2021 +31 days Advisory disclosed
12/09/2021 +0 days VulDB entry created
12/12/2021 +3 days VulDB last update

Sourcesinfoedit

Vendor: https://www.mozilla.org/
Product: https://www.mozilla.org/en-US/firefox/

Advisory: mozilla.org
Status: Confirmed

CVE: CVE-2021-43544 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20130704

Entryinfoedit

Created: 12/09/2021 08:59 AM
Updated: 12/12/2021 02:25 AM
Changes: (1) source_cve_nvd_summary
Complete: 🔍

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