VDB-155596 · CVE-2020-12391 · GCVE-0-2020-12391

Mozilla Firefox/Firefox ESR up to 75.x data URI CSP input validation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.6	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical was found in Mozilla Firefox and Firefox ESR up to 75.x. Affected by this issue is some unknown functionality of the component data URI Handler. Executing a manipulation can lead to input validation (CSP). This vulnerability is handled as CVE-2020-12391. The attack can be executed remotely. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Mozilla Firefox and Firefox ESR up to 75.x (Web Browser) and classified as critical. This vulnerability affects an unknown function of the component data URI Handler. The manipulation with an unknown input leads to a input validation vulnerability (CSP). The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Documents formed using data: URLs in an OBJECT element failed to inherit the CSP of the creating context. This allowed the execution of scripts that should have been blocked, albeit with a unique opaque origin. This vulnerability affects Firefox < 76.

The weakness was released 05/26/2020. This vulnerability was named CVE-2020-12391 since 04/28/2020. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. Successful exploitation requires user interaction by the victim. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/27/2020).

Upgrading to version 76.0 eliminates this vulnerability.

Entries connected to this vulnerability are available at VDB-155594 and VDB-155593. Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

Web Browser

Vendor

Mozilla

Name

Version

75.x

License

open-source

Website

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

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.9
VulDB Meta Temp Score: 6.7

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

NVD Base Score: 7.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

NVD Base Score: 🔍

Exploitinginfo

Name: CSP
Class: Input validation / CSP
CWE: CWE-20
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Firefox/Firefox ESR 76.0

Timelineinfo

04/28/2020 🔍
05/26/2020 +28 days 🔍
05/27/2020 +1 days 🔍
05/27/2020 +0 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Status: Not defined

CVE: CVE-2020-12391 (🔍)
GCVE (CVE): GCVE-0-2020-12391
GCVE (VulDB): GCVE-100-155596
See also: 🔍

Entryinfo

Created: 05/27/2020 08:22
Updated: 05/27/2020 08:27
Changes: 05/27/2020 08:22 (40), 05/27/2020 08:27 (18)
Complete: 🔍
Cache ID: 216::103