#VU7073 Privilege escalation in Firefox ESR - CVE-2017-7760

Vulnerability identifier: #VU7073

Vulnerability risk: Low

CVSSv4.0: 1.1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2017-7760

CWE-ID: CWE-427

Exploitation vector: Local

Exploit availability: No

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

Vendor: Mozilla

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

The vulnerability exists due to uncontrolled search path element. A local attacker can pass a special path to the callback parameter through the Mozilla Maintenance Service, manipulate files in the installation directory and gain system privileges.

Successful exploitation of the vulnerability may result in privileges escalation.

Mitigation
Update to version 52.2.

Vulnerable software versions

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

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

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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.