#VU10184 Privilege escalation in Mozilla Firefox - CVE-2018-5105

Vulnerability identifier: #VU10184

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2018-5105

CWE-ID: CWE-264

Exploitation vector: Local

Exploit availability: No

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

Vendor: Mozilla

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

The weakness exists due to an error in WebExtensions. A local attacker can bypass prompts to save and open an arbitrarily downloaded file and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 58.0.

Vulnerable software versions

Mozilla Firefox: 57.0 - 57.0.4

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2018-02/

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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