#VU18046 Resource management error in Mozilla Firefox - CVE-2019-9809

Vulnerability identifier: #VU18046

Vulnerability risk: Low

CVSSv4.0: 1.2 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2019-9809

CWE-ID: CWE-399

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 perform a denial of service (DoS) attack.

The vulnerability exists due to incorrect processing of modal alert messages sent by FTP server. A remote attacker can trick the victim to connect to a malicious FTP server and trigger a series of modal alert messages for these resources through invalid credentials or locations, resulting in denial of service attack

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Mozilla Firefox: 61.0 - 65.0.2

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External links
https://www.mozilla.org/en-US/security/advisories/mfsa2019-07/
https://bugzilla.mozilla.org/show_bug.cgi?id=1282430
https://bugzilla.mozilla.org/show_bug.cgi?id=1523249

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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.