Rule Category

BROWSER-FIREFOX -- Snort has detected traffic known to exploit vulnerabilities present in the Firefox browser, or products that have the "Gecko" engine (Thunderbird email client, etc.).

Alert Message

BROWSER-FIREFOX Mozilla Firefox RemotePrompt sandbox escape attempt

Rule Explanation

This event is generated when an attacker attempts to exploit a sandbox escape vulnerability in Mozilla Firefox. Impact: Attempted User Privilege Gain Details: This rule checks for attempts to exploit a sandbox escape vulnerability in Mozilla Firefox's RemotePrompt handler, which will allow the attacker to open additional web content in a privileged context. An attacker can exploit this vulnerability in combination with another Firefox vulnerability to achieve remote code execution on the victim's machine. Ease of Attack:

What To Look For

No information provided

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

No rule groups

CVE

Additional Links

Rule Vulnerability

CVE Additional Information

CVE-2019-11708
Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxed parent process opening web content chosen by a compromised child process. When combined with additional vulnerabilities this could result in executing arbitrary code on the user's computer. This vulnerability affects Firefox ESR < 60.7.2, Firefox < 67.0.4, and Thunderbird < 60.7.2.
Details
Severity Base Score10.0
Impact Score6.0 Exploit Score3.9
Confidentiality ImpactHIGH Integrity ImpactHIGH
Availability ImpactHIGH Attack VectorNETWORK
ScopeCHANGED User InteractionNONE
Authentication Ease of AccessLOW
Privileges RequiredNONE