#VU1831 Security bypass in Mozilla products - CVE-2015-4495

Vulnerability identifier: #VU1831

Vulnerability risk: Critical

CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red

CVE-ID: CVE-2015-4495

CWE-ID: CWE-20

Exploitation vector: Remote access

Exploit availability: The vulnerability is being exploited in the wild

Vulnerable software:
Firefox ESR
Mozilla Firefox
Firefox OS

Software vendor:
Mozilla

The vulnerabiity allows a remote attacker to bypass security restrictions on the target system.

The weakness exists due to improper input validation. A remote attacker can create a specially crafted PDF file, trick the victim into opening it, bypass same-origin policy and inject arbitrary JavaScript into the built-in PDF Viewer to gain access to arbitrary files on the system.

Successful exploitation of this vulnerability may result in access to local files and privilege escalation, leading to system compromise.

Note: the vulnerability was being actively exploited.

Update Mozilla Firefox to version 39.0.3, Mozilla Firefox ESR to version 38.1, Mozilla Firefox OS to version 2.2.

• https://www.mozilla.org/en-US/security/advisories/mfsa2015-78/