Security bypass in Mozilla Firefox

Published: 2016-08-06 00:00:00 | Updated: 2017-02-16
Severity Critical
Patch available YES
Number of vulnerabilities 1
CVE ID CVE-2015-4495
CVSSv3 8.9 [CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:F/RL:O/RC:C]
CWE ID CWE-20
Exploitation vector Network
Public exploit This vulnerability is being exploited in the wild.
Vulnerable software Mozilla Firefox
Vulnerable software versions Mozilla Firefox ESR 38.1.1
Mozilla Firefox ESR 38.1
Mozilla Firefox ESR 38.0

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Vendor URL Mozilla

Security Advisory

1) Security bypass

Description

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.

Remediation

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

External links

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

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