Mozilla Firefox < 51 Multiple Vulnerabilities (macOS)

critical Nessus Plugin ID 96774


The remote macOS or Mac OS X host contains a web browser that is affected by multiple vulnerabilities.


The version of Mozilla Firefox installed on the remote macOS or Mac OS X host is prior to 51. It is, therefore, affected by the following vulnerabilities :

- Mozilla developers and community members Christian Holler, Gary Kwong, Andre Bargull, Jan de Mooij, Tom Schuster, and Oriol reported memory safety bugs present in Firefox 50.1 and Firefox ESR 45.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code.

- Mozilla developers and community members Gary Kwong, Olli Pettay, Tooru Fujisawa, Carsten Book, Andrew McCreight, Chris Pearce, Ronald Crane, Jan de Mooij, Julian Seward, Nicolas Pierron, Randell Jesup, Esther Monchari, Honza Bambas, and Philipp reported memory safety bugs present in Firefox 50.1. Some of these bugs showed evidence of memory corruption and we presume that with enough effort that some of these could be exploited to run arbitrary code. (CVE-2017-5374)

- JIT code allocation can allow for a bypass of ASLR and DEP protections leading to potential memory corruption attacks. (CVE-2017-5375)

- Use-after-free while manipulating XSL in XSLT documents (CVE-2017-5376)

- A memory corruption vulnerability in Skia that can occur when using transforms to make gradients, resulting in a potentially exploitable crash.

- Hashed codes of JavaScript objects are shared between pages. This allows for pointer leaks because an object's address can be discovered through hash codes, and also allows for data leakage of an object's content using these hash codes. (CVE-2017-5378)

- Use-after-free vulnerability in Web Animations when interacting with cycle collection found through fuzzing. (CVE-2017-5379)

- A potential use-after-free found through fuzzing during DOM manipulation of SVG content. (CVE-2017-5380)

- The 'export' function in the Certificate Viewer can force local filesystem navigation when the 'common name' in a certificate contains slashes, allowing certificate content to be saved in unsafe locations with an arbitrary filename. (CVE-2017-5381)

- Feed preview for RSS feeds can be used to capture errors and exceptions generated by privileged content, allowing for the exposure of internal information not meant to be seen by web content. (CVE-2017-5382)

- URLs containing certain unicode glyphs for alternative hyphens and quotes do not properly trigger punycode display, allowing for domain name spoofing attacks in the location bar. (CVE-2017-5383)

- Proxy Auto-Config (PAC) files can specify a JavaScript function called for all URL requests with the full URL path which exposes more information than would be sent to the proxy itself in the case of HTTPS. Normally the Proxy Auto-Config file is specified by the user or machine owner and presumed to be non-malicious, but if a user has enabled Web Proxy Auto Detect (WPAD) this file can be served remotely. (CVE-2017-5384)

- Data sent with in multipart channels, such as the multipart/x-mixed-replace MIME type, will ignore the referrer-policy response header, leading to potential information disclosure for sites using this header.

- WebExtension scripts can use the 'data:' protocol to affect pages loaded by other web extensions using this protocol, leading to potential data disclosure or privilege escalation in affected extensions.

- The existence of a specifically requested local file can be found due to the double firing of the 'onerror' when the 'source' attribute on a <track> tag refers to a file that does not exist if the source page is loaded locally. (CVE-2017-5387)

- A STUN server in conjunction with a large number of 'webkitRTCPeerConnection' objects can be used to send large STUN packets in a short period of time due to a lack of rate limiting being applied on e10s systems, allowing for a denial of service attack. (CVE-2017-5388)

- WebExtensions could use the 'mozAddonManager' API by modifying the CSP headers on sites with the appropriate permissions and then using host requests to redirect script loads to a malicious site. This allows a malicious extension to then install additional extensions without explicit user permission.

- The JSON viewer in the Developer Tools uses insecure methods to create a communication channel for copying and viewing JSON or HTTP headers data, allowing for potential privilege escalation. (CVE-2017-5390)

- Special 'about:' pages used by web content, such as RSS feeds, can load privileged 'about:' pages in an iframe.
If a content-injection bug were found in one of those pages this could allow for potential privilege escalation. (CVE-2017-5391)

- The 'mozAddonManager' allows for the installation of extensions from the CDN for, a publicly accessible site. This could allow malicious extensions to install additional extensions from the CDN in combination with an XSS attack on Mozilla AMO sites.

- 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.

Note that Tenable Network Security has extracted the preceding description block directly from the Mozilla security advisories.
Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.


Upgrade to Mozilla Firefox version 51.0 or later.

See Also

Plugin Details

Severity: Critical

ID: 96774

File Name: macosx_firefox_51.nasl

Version: 1.8

Type: local

Agent: macosx

Published: 1/25/2017

Updated: 11/13/2019

Supported Sensors: Nessus Agent, Nessus

Risk Information


Risk Factor: Critical

Score: 9.7


Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2017-5396


Risk Factor: Critical

Base Score: 9.8

Temporal Score: 9.4

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:H/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:mozilla:firefox

Required KB Items: MacOSX/Firefox/Installed

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 1/24/2017

Vulnerability Publication Date: 1/24/2017

Reference Information

CVE: CVE-2017-5373, CVE-2017-5374, CVE-2017-5375, CVE-2017-5376, CVE-2017-5377, CVE-2017-5378, CVE-2017-5379, CVE-2017-5380, CVE-2017-5381, CVE-2017-5382, CVE-2017-5383, CVE-2017-5384, CVE-2017-5385, CVE-2017-5386, CVE-2017-5387, CVE-2017-5388, CVE-2017-5389, CVE-2017-5390, CVE-2017-5391, CVE-2017-5393, CVE-2017-5396

BID: 95757, 95758, 95759, 95761, 95762, 95763, 95769

MFSA: 2017-01