Mozilla Firefox up to 50 Media Decoder use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.9$0-$5k0.00

Summaryinfo

A vulnerability was found in Mozilla Firefox up to 50. It has been rated as critical. This affects an unknown function of the component Media Decoder. The manipulation leads to use after free. This vulnerability is referenced as CVE-2017-5396. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Mozilla Firefox up to 50 (Web Browser). This issue affects an unknown function of the component Media Decoder. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

A use-after-free vulnerability in the Media Decoder when working with media files when some events are fired after the media elements are freed from memory. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.

The bug was discovered 01/24/2017. The weakness was published 01/24/2017 by Muneaki Nishimura (Nils) as MFSA 2017-01 as confirmed security advisory (Website). The advisory is shared at mozilla.org. The identification of this vulnerability is CVE-2017-5396 since 01/13/2017. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 96804 (Slackware 14.1 / 14.2 / current : mozilla-thunderbird (SSA:2017-026-01)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family Slackware Local Security Checks and running in the context l. The commercial vulnerability scanner Qualys is able to test this issue with plugin 175948 (Debian Security Update for firefox-esr (DSA 3771-1)).

Upgrading to version 51 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

The vulnerability is also documented in the databases at Tenable (96804), SecurityFocus (BID 95769†) and SecurityTracker (ID 1037693†). Similar entries are available at VDB-96001, VDB-96002, VDB-96003 and VDB-96004. If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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Vendor

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.0
VulDB Meta Temp Score: 7.9

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

NVD Base Score: 9.8
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: Use after free
CWE: CWE-416 / CWE-119
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: 96804
Nessus Name: Slackware 14.1 / 14.2 / current : mozilla-thunderbird (SSA:2017-026-01)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Context: 🔍

OpenVAS ID: 881932
OpenVAS Name: CentOS Update for thunderbird CESA-2017:0238 centos7
OpenVAS File: 🔍
OpenVAS Family: 🔍

Qualys ID: 🔍
Qualys Name: 🔍

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

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

Upgrade: Firefox 51

Timelineinfo

01/13/2017 🔍
01/24/2017 +11 days 🔍
01/24/2017 +0 days 🔍
01/24/2017 +0 days 🔍
01/24/2017 +0 days 🔍
01/25/2017 +1 days 🔍
01/26/2017 +1 days 🔍
01/27/2017 +1 days 🔍
06/11/2018 +499 days 🔍
11/26/2025 +2725 days 🔍

Sourcesinfo

Vendor: mozilla.org
Product: mozilla.org

Advisory: MFSA 2017-01
Researcher: Muneaki Nishimura (Nils)
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2017-5396 (🔍)
GCVE (CVE): GCVE-0-2017-5396
GCVE (VulDB): GCVE-100-96005

OVAL: 🔍

SecurityFocus: 95769 - Mozilla Firefox Multiple Security Vulnerabilities
OSVDB: - CVE-2017-5396 - Mozilla - Multiple Products - Use-After-Free Issue
SecurityTracker: 1037693

See also: 🔍

Entryinfo

Created: 01/26/2017 15:17
Updated: 11/26/2025 02:01
Changes: 01/26/2017 15:17 (82), 08/02/2020 12:44 (8), 11/26/2025 02:01 (17)
Complete: 🔍
Cache ID: 216::103

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