Mozilla Firefox/Firefox ESR Clipboard cross site scripting

CVSS Meta Temp Score
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CTI Interest Score
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6.0$0-$5k0.00

Summaryinfo

A vulnerability classified as critical has been found in Mozilla Firefox and Firefox ESR. The impacted element is an unknown function of the component Clipboard Handler. This manipulation causes cross site scripting. This vulnerability is handled as CVE-2019-17016. The attack can be initiated remotely. There is not any exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Mozilla Firefox and Firefox ESR (Web Browser) (version now known) and classified as critical. Affected by this vulnerability is some unknown processing of the component Clipboard Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

When pasting a &lt;style&gt; tag from the clipboard into a rich text editor, the CSS sanitizer incorrectly rewrites a @namespace rule. This could allow for injection into certain types of websites resulting in data exfiltration. This vulnerability affects Firefox ESR < 68.4 and Firefox < 72.

The weakness was released 01/08/2020 as MFSA 2020-01 as confirmed security advisory (Website). The advisory is shared at mozilla.org. This vulnerability is known as CVE-2019-17016 since 09/30/2019. 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 T1059.007 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 291751 (MiracleLinux 7 : firefox-68.4.1-1.0.1.el7.AXS7 (AXSA:2020-4427:01)), which helps to determine the existence of the flaw in a target environment.

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (291751). Entries connected to this vulnerability are available at VDB-148440, VDB-148442, VDB-148443 and VDB-148444. Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

Vendor

Name

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.0

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

NVD Base Score: 6.1
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: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
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: 291751
Nessus Name: MiracleLinux 7 : firefox-68.4.1-1.0.1.el7.AXS7 (AXSA:2020-4427:01)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Timelineinfo

09/30/2019 🔍
01/08/2020 +100 days 🔍
01/08/2020 +0 days 🔍
01/09/2020 +1 days 🔍
01/20/2026 +2203 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2020-01
Status: Confirmed

CVE: CVE-2019-17016 (🔍)
GCVE (CVE): GCVE-0-2019-17016
GCVE (VulDB): GCVE-100-148441
See also: 🔍

Entryinfo

Created: 01/09/2020 10:00
Updated: 01/20/2026 12:04
Changes: 01/09/2020 10:00 (42), 01/09/2020 10:05 (18), 01/20/2026 12:04 (19)
Complete: 🔍
Cache ID: 216::103

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

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