CVE-2020-24355

Severity Score

9.8

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

Zyxel VMG5313-B30B router on firmware 5.13(ABCJ.6)b3_1127, and possibly older versions of firmware are affected by insecure permissions which allows regular and other users to create new users with elevated privileges. This is done by changing "FirstIndex" field in JSON that is POST-ed during account creation. Similar may also be possible with account deletion.

El enrutador Zyxel VMG5313-B30B en la versión de firmware 5.13 (ABCJ.6) b3_1127, y posiblemente las versiones de firmware anteriores, están afectadas por permisos no seguros que permiten a usuarios regulares y de otro tipo crear nuevos usuarios con privilegios elevados. Esto se hace al cambiar el campo "FirstIndex" en JSON que es Publicado durante la creación de la cuenta. También es posible hacer algo similar con la eliminación de la cuenta

*Credits: N/A

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Network

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-08-13 CVE Reserved
2020-09-02 CVE Published
2024-05-20 EPSS Updated
2024-08-04 CVE Updated
2024-08-04 First Exploit
---------- Exploited in Wild
---------- KEV Due Date

CWE

CWE-732: Incorrect Permission Assignment for Critical Resource

CAPEC

References (3)

URL	Tag	Source

URL	Date	SRC
https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B	2024-08-04
https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2	2024-08-04

URL	Date	SRC

URL	Date	SRC
https://www.zyxel.com/support/security_advisories.shtml	2020-09-11

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Zyxel Search vendor "Zyxel"	Vmg5313-b30b Firmware Search vendor "Zyxel" for product "Vmg5313-b30b Firmware"	<= 5.13\(abcj.6\)b3_1127 Search vendor "Zyxel" for product "Vmg5313-b30b Firmware" and version " <= 5.13\(abcj.6\)b3_1127"	-	Affected	in	Zyxel Search vendor "Zyxel"	Vmg5313-b30b Search vendor "Zyxel" for product "Vmg5313-b30b"	-	-	Safe