VDB-216549 · CVE-2020-15679 · GCVE-0-2020-15679

Mozilla VPN on Windows/iOS/Android OAuth session fixiation

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
7.3	$0-$5k	0.00

Summaryinfo

A vulnerability marked as critical has been reported in Mozilla VPN on Windows/iOS/Android. This vulnerability affects unknown code of the component OAuth. Performing a manipulation results in session fixiation. This vulnerability is cataloged as CVE-2020-15679. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical has been found in Mozilla VPN on Windows/iOS/Android (Web Browser) (the affected version is unknown). This affects an unknown code of the component OAuth. The manipulation with an unknown input leads to a session fixiation vulnerability. CWE is classifying the issue as CWE-384. Authenticating a user, or otherwise establishing a new user session, without invalidating any existing session identifier gives an attacker the opportunity to steal authenticated sessions. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

An OAuth session fixation vulnerability existed in the VPN login flow, where an attacker could 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. This vulnerability affects Mozilla VPN iOS 1.0.7 < (929), Mozilla VPN Windows < 1.2.2, and Mozilla VPN Android 1.1.0 < (1360).

The weakness was shared 12/22/2022. The advisory is shared at mozilla.org. This vulnerability is uniquely identified as CVE-2020-15679 since 07/10/2020. Neither technical details nor an exploit are publicly available.

Upgrading eliminates this vulnerability. The upgrade is hosted for download at mozilla.org. Applying the patch 981c840276ef3aee98cf5d42993d484ee99b28d9 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

Web Browser

Vendor

Mozilla

Name

License

open-source

Website

Vendor: https://www.mozilla.org/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.6
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Session fixiation
CWE: CWE-384
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: mozilla.org
Patch: 981c840276ef3aee98cf5d42993d484ee99b28d9

Timelineinfo

07/10/2020 🔍
12/22/2022 +895 days 🔍
12/22/2022 +0 days 🔍
04/16/2025 +846 days 🔍

Sourcesinfo

Vendor: mozilla.org

Advisory: 981c840276ef3aee98cf5d42993d484ee99b28d9
Status: Confirmed

CVE: CVE-2020-15679 (🔍)
GCVE (CVE): GCVE-0-2020-15679
GCVE (VulDB): GCVE-100-216549
scip Labs: https://www.scip.ch/en/?labs.20130704

Entryinfo

Created: 12/22/2022 22:32
Updated: 04/16/2025 18:23
Changes: 12/22/2022 22:32 (43), 01/22/2023 14:09 (1), 01/22/2023 14:13 (11), 04/16/2025 18:23 (16)
Complete: 🔍
Cache ID: 216::103