Several Vulnerabilities in Mozilla Thunderbird Identified

Several Vulnerabilities in Mozilla Thunderbird Identified

A cybersecurity advisory was issued Thursday, Jan. 30, 2019, regarding multiple vulnerabilities in Mozilla Thunderbird. Successful exploitation of these vulnerabilities could allow arbitrary code execution.

What It Is:
Mozilla Thunderbird is an email client. Successful exploitation of the most severe of these vulnerabilities could allow for arbitrary code execution. Depending on the privileges associated with the user, an attacker could then install programs; view, change, or delete data; or create new accounts with full user rights. Users whose accounts are configured to have fewer user rights on the system could be less impacted than those who operate with administrative user rights.

Read the original Mozilla Foundation Security Advisory.

Threat Intelligence:
There are currently no reports of these vulnerabilities being exploited in the wild.

What It Means:
If your business or organization use Mozilla Thunderbird, you will need to apply the update after appropriate testing to prevent a possible security breach.

Systems Affected Include:
• Mozilla Thunderbird versions prior to 60.5

• Large and medium government entities: High
• Small government entities: Medium
• Large and medium business entities: High
• Small business entities: Medium
Home users: Low

Technical Summary:
Multiple vulnerabilities have been identified in Mozilla Thunderbird, the most severe of which could allow for arbitrary code execution. Details of the vulnerabilities are as follows:

• An earlier fix for an Inter-process Communication (IPC) vulnerability, CVE-2011-3079, added authentication to communication between IPC endpoints and server parents during IPC process creation. This authentication is insufficient for channels created after the IPC process is started, leading to the authentication not being correctly applied to later channels. This could allow for a sandbox escape through IPC channels due to lack of message validation in the listener process. (CVE-2018-18505)
• A use-after-free vulnerability can occur while parsing an HTML5 stream in concert with custom HTML elements. This results in the stream parser object being freed while still in use, leading to a potentially exploitable crash. (CVE-2018-18500)
• A vulnerability in the Libical library used by Thunderbird can allow remote attackers to cause a denial of service (use-after-free) via a crafted ICS calendar file. (CVE-2016-5824)
• Memory safety bugs present in Thunderbird 60.4. 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-2018-18501)

What To Do:
We recommend the following actions be taken:

• Apply appropriate updates provided by Mozilla to vulnerable systems, immediately after appropriate testing.
• Run all software as a non-privileged user (one without administrative privileges) to diminish the effects of a successful attack.
• Remind users not to visit untrusted websites or follow links provided by unknown or untrusted sources.
• Inform and educate users regarding the threats posed by hypertext links contained in emails or attachments especially from un-trusted sources.
• Apply the Principle of Least Privilege to all systems and services.

Negative Consequences of Lost or Stolen Data:
The loss or theft of proprietary data can have severe impacts, particularly if the compromise becomes public and sensitive information is exposed. Possible impacts include:

• Temporary or permanent loss of sensitive or proprietary information.
• Disruption to regular operations.
• Financial losses incurred to restore systems and files.
• Potential harm to an organization’s reputation.

Should your agency or business need assistance with the detection of vulnerabilities in any of the above products or updates to include patches, Dox can help. Please contact Dox if there is anything we can do to assist in securing your agency, business, or organization.

Thank you for your time and stay safe online.