#VU15491 Integer overflow in Mozilla Firefox - CVE-2018-12393

Vulnerability identifier: #VU15491

Vulnerability risk: High

CVSSv4.0: 6.1 [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:U/U:Amber]

CVE-ID: CVE-2018-12393

CWE-ID: CWE-787

Exploitation vector: Network

Exploit availability: No

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

Vendor: Mozilla

Description
The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The weakness exists due to integer overflow during the conversion of scripts to an internal UTF-16 representation. A remote attacker can trick the victim into visiting a specially crafted website, trigger out-of-bounds write and execute arbitrary code with elevated privileges.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version 63.0.

Vulnerable software versions

Mozilla Firefox: 62.0 - 62.0.3

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2018-26/

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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.