The "pingsender" executable used by the Firefox Health Report dynamically loads a system copy of libcurl, which an attacker could replace. This allows for privilege escalation as the replaced libcurl code will run with Firefox's privileges. Note: This attack requires an attacker have local system access and only affects OS X and Linux. Windows systems are not affected. This vulnerability affects Firefox < 57.
Accessing, Modifying or Executing Executable Files
An attack of this type exploits a system's configuration that allows an attacker to either directly access an executable file, for example through shell access; or in a possible worst case allows an attacker to upload a file and then execute it. Web servers, ftp servers, and message oriented middleware systems which have many integration points are particularly vulnerable, because both the programmers and the administrators must be in synch regarding the interfaces and the correct privileges for each interface.
Leverage Executable Code in Non-Executable Files
An attack of this type exploits a system's trust in configuration and resource files, when the executable loads the resource (such as an image file or configuration file) the attacker has modified the file to either execute malicious code directly or manipulate the target process (e.g. application server) to execute based on the malicious configuration parameters. Since systems are increasingly interrelated mashing up resources from local and remote sources the possibility of this attack occurring is high.
The attack can also target server processes. The attacker edits the resource or configuration file, for example a web.xml file used to configure security permissions for a J2EE app server, adding role name "public" grants all users with the public role the ability to use the administration functionality.
The server trusts its configuration file to be correct, but when they are manipulated, the attacker gains full control.
This type of attack against older telephone switches and trunks has been around for decades. A tone is sent by an adversary to impersonate a supervisor signal which has the effect of rerouting or usurping command of the line. While the US infrastructure proper may not contain widespread vulnerabilities to this type of attack, many companies are connected globally through call centers and business process outsourcing. These international systems may be operated in countries which have not upgraded Telco infrastructure and so are vulnerable to Blue boxing. Blue boxing is a result of failure on the part of the system to enforce strong authorization for administrative functions. While the infrastructure is different than standard current applications like web applications, there are historical lessons to be learned to upgrade the access control for administrative functions.
Restful Privilege Elevation
Rest uses standard HTTP (Get, Put, Delete) style permissions methods, but these are not necessarily correlated generally with back end programs. Strict interpretation of HTTP get methods means that these HTTP Get services should not be used to delete information on the server, but there is no access control mechanism to back up this logic. This means that unless the services are properly ACL'd and the application's service implementation are following these guidelines then an HTTP request can easily execute a delete or update on the server side.
The attacker identifies a HTTP Get URL such as http://victimsite/updateOrder, which calls out to a program to update orders on a database or other resource. The URL is not idempotent so the request can be submitted multiple times by the attacker, additionally, the attacker may be able to exploit the URL published as a Get method that actually performs updates (instead of merely retrieving data). This may result in malicious or inadvertent altering of data on the server.
Target Programs with Elevated Privileges
This attack targets programs running with elevated privileges. The attacker would try to leverage a bug in the running program and get arbitrary code to execute with elevated privileges. For instance an attacker would look for programs that write to the system directories or registry keys (such as HKLM, which stores a number of critical Windows environment variables). These programs are typically running with elevated privileges and have usually not been designed with security in mind. Such programs are excellent exploit targets because they yield lots of power when they break. The malicious user try to execute its code at the same level as a privileged system call.
Manipulating Input to File System Calls
An attacker manipulates inputs to the target software which the target software passes to file system calls in the OS. The goal is to gain access to, and perhaps modify, areas of the file system that the target software did not intend to be accessible.
The version of Mozilla Firefox installed on the remote Windows host is prior to 57. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes.
The version of Mozilla Firefox ESR installed on the remote Windows host is prior to 52.5. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes.
Mozilla Firefox ESR < 52.5 Multiple Vulnerabilities
MacOS X Local Security Checks
The version of Mozilla Firefox ESR installed on the remote macOS or Mac OS X host is prior to 52.5. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable crashes.
Mozilla Firefox ESR < 52.5 Multiple Vulnerabilities (macOS)
MacOS X Local Security Checks
The version of Mozilla Firefox installed on the remote macOS or Mac OS X host is prior to 57. It is, therefore, affected by multiple vulnerabilities, some of which allow code execution and potentially exploitable application crashes.
Mozilla Firefox < 57 Multiple Vulnerabilities (macOS)
FreeBSD Local Security Checks
Mozilla Foundation reports :
CVE-2017-7828: Use-after-free of PressShell while restyling layout
CVE-2017-7830: Cross-origin URL information leak through Resource Timing API
CVE-2017-7832: Domain spoofing through use of dotless 'i' character followed by accent markers
CVE-2017-7833: Domain spoofing with Arabic and Indic vowel marker characters
CVE-2017-7834: data: URLs opened in new tabs bypass CSP protections
CVE-2017-7835: Mixed content blocking incorrectly applies with redirects
CVE-2017-7836: Pingsender dynamically loads libcurl on Linux and OS X
CVE-2017-7837: SVG loaded as can use meta tags to set cookies
CVE-2017-7838: Failure of individual decoding of labels in international domain names triggers punycode display of entire IDN
CVE-2017-7840: Exported bookmarks do not strip script elements from user-supplied tags
CVE-2017-7842: Referrer Policy is not always respected for elements
CVE-2017-7827: Memory safety bugs fixed in Firefox 57
CVE-2017-7826: Memory safety bugs fixed in Firefox 57 and Firefox ESR 52.5