Vulnerability identifier: #VU7069

Vulnerability risk: High

CVSSv3.1: 8.3 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7755

CWE-ID: CWE-426

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox ESR
Client/Desktop applications / Web browsers

Vendor: Mozilla

Description
The vulnerability allows a remote attacker to gain elevated privileges on the target system.

The vulnerability exists due to insecure .dll loading mechanism when opening files. A remote attacker can place a specially crafted .dll file along with installer on a remote SBM or WebDAV share, trick the victim into running the installer file from this directory and execute arbitrary code on the target system with privileges of the current victim.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 52.2.

Vulnerable software versions

Firefox ESR: 52.0.1, 45.0 - 45.8, 38.0 - 38.8.0

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External links
http://www.mozilla.org/en-US/security/advisories/mfsa2017-16/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.