Mozilla Firefox/Thunderbird resource:/ access control

CVSS Meta Temp Score
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CTI Interest Score
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A vulnerability classified as critical was found in Mozilla Firefox and Thunderbird (Web Browser). Affected by this vulnerability is some unknown functionality of the component resource:/ Handler. The manipulation with an unknown input leads to a access control vulnerability. The CWE definition for the vulnerability is CWE-264. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was presented 03/31/2015 by Mariusz Mlynski as MFSA 2015-33 as confirmed security advisory (Website) via ZDI (Zero Day Initiative). It is possible to read the advisory at This vulnerability is known as CVE-2015-0816 since 01/07/2015. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are unknown but a public exploit is available. The attack technique deployed by this issue is T1068 according to MITRE ATT&CK.

A public exploit has been developed in Ruby. It is possible to download the exploit at It is declared as highly functional. We expect the 0-day to have been worth approximately $25k-$100k. The vulnerability scanner Nessus provides a plugin with the ID 82477 (CentOS 5 / 6 / 7 : firefox / xulrunner (CESA-2015:0766)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family CentOS Local Security Checks. The commercial vulnerability scanner Qualys is able to test this issue with plugin 196052 (Ubuntu Security Notification for Thunderbird Vulnerabilities (USN-2552-1)).

Upgrading eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability. Furthermore it is possible to detect and prevent this kind of attack with TippingPoint and the filter 20619.

The vulnerability is also documented in the databases at X-Force (102006) and Tenable (82477). Additional details are provided at See 74499, 74500, 74501 and 74502 for similar entries.


  • Mozilla Firefox 36
  • Mozilla Firefox ESR 31.5
  • Mozilla Thunderbird 31.5






CPE 2.3info

CPE 2.2info


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VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.4

VulDB Base Score: 7.3
VulDB Temp Score: 6.4
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Class: Access control
CWE: CWE-264
ATT&CK: T1068

Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Highly functional
Programming Language: 🔍
Download: 🔍

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Nessus ID: 82477
Nessus Name: CentOS 5 / 6 / 7 : firefox / xulrunner (CESA-2015:0766)
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OpenVAS ID: 703211
OpenVAS Name: Debian Security Advisory DSA 3211-1 (iceweasel - security update)
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MetaSploit ID: firefox_pdfjs_privilege_escalation.rb
MetaSploit Name: Firefox PDF.js Privileged Javascript Injection
MetaSploit File: 🔍

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Threat Intelligenceinfo

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Recommended: Upgrade
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01/07/2015 🔍
03/31/2015 +83 days 🔍
03/31/2015 +0 days 🔍
03/31/2015 +0 days 🔍
03/31/2015 +0 days 🔍
03/31/2015 +0 days 🔍
04/01/2015 +1 days 🔍
04/01/2015 +0 days 🔍
04/01/2015 +0 days 🔍
05/02/2022 +2588 days 🔍



Advisory: MFSA 2015-33
Researcher: Mariusz Mlynski
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2015-0816 (🔍)

X-Force: 102006 - Mozilla Firefox and Thunderbird resource security bypass
SecurityTracker: 1031996 - Mozilla Firefox Bugs Let Remote Users Execute Arbitrary Code, Bypass Security Restrictions, and Obtain Potentially Sensitive Information
Vulnerability Center: 49304 - Mozilla Firefox, Firefox ESR and Thunderbird Remote Code Execution due to Improper Restriction of URLs, Medium
SecurityFocus: 73461 - Mozilla Firefox Firefox ESR and Thunderbird CVE-2015-0816 Privilege Escalation Vulnerability

scip Labs:
Misc.: 🔍
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Created: 04/01/2015 01:19 PM
Updated: 05/02/2022 08:14 AM
Changes: 04/01/2015 01:19 PM (77), 06/24/2017 09:30 AM (17), 05/02/2022 08:13 AM (4), 05/02/2022 08:14 AM (1)
Complete: 🔍


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