Session fixation in Mozilla VPN

1) Session Fixation

EUVDB-ID: #VU48164

Risk: Medium

CVSSv3.1: 4.1 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-15679

CWE-ID: CWE-384 - Session Fixation

Exploit availability: No

Description

The vulnerability allows a remote attacker to impersonate sessions of other application users.

The vulnerability exists within OAuth session handling functionality. A remote attacker can craft a custom login URL, convince a VPN user to login via that URL, and obtain authenticated access as that user.

This issue is limited to cases where attacker and victim are sharing the same source IP and could allow the ability to view session states and disconnect VPN sessions.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Mozilla VPN Windows: 0.13 - 1.2

Mozilla VPN iOS: 1.0.0 - 1.0.6

Mozilla VPN Android: 1.0.0

External links

http://www.mozilla.org/en-US/security/advisories/mfsa2020-48/

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.