Mozilla Firefox up to 47 Location Bar input validation

CVSS Meta Temp Score
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4.1$0-$5k0.00

A vulnerability was found in Mozilla Firefox up to 47 (Web Browser). It has been classified as problematic. This affects an unknown part of the component Location Bar. The manipulation with an unknown input leads to a input validation vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Mozilla Firefox before 48.0 allows remote attackers to spoof the location bar via crafted characters in the media type of a data: URL.

The weakness was shared 08/02/2016 by Firas Salem (musicDespiteEverything) as MFSA 2016-66 as confirmed security advisory (Website). The advisory is shared at mozilla.org. This vulnerability is uniquely identified as CVE-2016-5251 since 06/03/2016. 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 advisory points out:

Security researcher Firas Salem reported that decoding url-encoded values in data: urls for display leads to potential spoofing in the Location bar by using non-ASCII and emoji characters in a data: url's mediatype. This issue could result in the wrong URL being displayed as a location, which can mislead users to believe they are on a different site than the one loaded.

The vulnerability scanner Nessus provides a plugin with the ID 92785 (Ubuntu 12.04 LTS / 14.04 LTS / 16.04 LTS : firefox vulnerabilities (USN-3044-1)), 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 196543 (Ubuntu Security Notification for Firefox Vulnerabilities (USN-3044-1)).

Upgrading to version 48 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 (92785). The entries 90424, 90425, 90426 and 90427 are related to this item.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB CVSS-B Score: 🔍
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CVSSv3info

VulDB Meta Base Score: 4.3
VulDB Meta Temp Score: 4.2

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

NVD Base Score: 4.3
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CVSSv2info

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VulDB Base Score: 🔍
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Exploitinginfo

Class: Input validation
CWE: CWE-20
ATT&CK: Unknown

Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

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EPSS Percentile: 🔍

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Current Price Estimation: 🔍

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Nessus ID: 92785
Nessus Name: Ubuntu 12.04 LTS / 14.04 LTS / 16.04 LTS : firefox vulnerabilities (USN-3044-1)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 65514
OpenVAS Name: SuSE Update for MozillaFirefox, mozilla-nss openSUSE-SU-2016:1964-1 (MozillaFirefox, mozilla-nss)
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
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Threat Intelligenceinfo

Interest: 🔍
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Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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Upgrade: Firefox 48

Timelineinfo

06/03/2016 🔍
08/02/2016 +60 days 🔍
08/02/2016 +0 days 🔍
08/02/2016 +0 days 🔍
08/03/2016 +1 days 🔍
08/04/2016 +1 days 🔍
08/04/2016 +0 days 🔍
08/08/2016 +4 days 🔍
03/16/2019 +950 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2016-66
Researcher: Firas Salem (musicDespiteEverything)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2016-5251 (🔍)
SecurityTracker: 1036508
SecurityFocus: 92260 - Mozilla Firefox Multiple Security Vulnerabilities

See also: 🔍

Entryinfo

Created: 08/04/2016 09:21
Updated: 03/16/2019 20:35
Changes: 08/04/2016 09:21 (75), 03/16/2019 20:35 (13)
Complete: 🔍

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