Vulnerability identifier: #VU32933

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15651

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Firefox for iOS
Mobile applications / Apps for mobile phones

Vendor: Mozilla

Description

The vulnerability allows a remote attacker to perform spoofing attack.

The vulnerability exists due to insufficient validation of filenames when downloading files, as a unicode RTL order character in the downloaded file name can be used to change the file's name during the download UI flow to change the file extension. A remote attacker can trick the victim into downloading malicious files to the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Firefox for iOS: 20.0 - 27.0

---

External links
http://www.mozilla.org/en-US/security/advisories/mfsa2020-34/

---

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.