Advisory Details

July 10th, 2019

Mozilla Firefox Language Pack XUL Injection Sandbox Escape Vulnerability

CVE ID	CVE-2019-9811
CVSS SCORE	5.6, AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:L
AFFECTED VENDORS	Mozilla
AFFECTED PRODUCTS	Firefox
VULNERABILITY DETAILS	This vulnerability allows remote attackers to escape the sandbox on affected installations of Mozilla Firefox. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists due to possibility of XUL injection via language pack. An attacker can leverage this vulnerability to escape the sandbox and execute code at medium integrity.
ADDITIONAL DETAILS	Mozilla has issued an update to correct this vulnerability. More details can be found at: https://www.mozilla.org/en-US/security/advisories/mfsa2019-21/
DISCLOSURE TIMELINE	2019-07-10 - Vulnerability reported to vendor 2019-07-10 - Coordinated public release of advisory
CREDIT	Niklas Baumstark (@_niklasb)

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