#VU10968 Out-of-bounds write in Firefox ESR - CVE-2018-5129

Vulnerability identifier: #VU10968

Vulnerability risk: High

CVSSv4.0: 8.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Amber]

CVE-ID: CVE-2018-5129

CWE-ID: CWE-787

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 execute arbitrary code on the target system.

The weakness exists due to a lack of parameter validation on IPC messages. A remote attacker can supply specially crafted malformed IPC messages, trigger out-of-bounds write, escape sandbox and execute arbitrary code.

Successful exploitation of the vulnerability may result in system compromise.

Mitigation
Update to version ESR 52.7.

Vulnerable software versions

Firefox ESR: 52.6.0

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2018-07/

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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.