CVE-2020-24355 Information

Description

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.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Reference

https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B https://blog.somegeneric.ninja/Zyxel_VMG5153_B30B_part2 https://www.zyxel.com/support/security_advisories.shtml

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

9.8