Vulnerability Details : CVE-2019-15799
Potential exploit
An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. User accounts created through the web interface of the device, when given non-admin level privileges, have the same level of privileged access as administrators when connecting to the device via SSH (while their permissions via the web interface are in fact restricted). This allows normal users to obtain the administrative password by running the tech-support command via the CLI: this contains the encrypted passwords for all users on the device. As these passwords are encrypted using well-known and static parameters, they can be decrypted and the original passwords (including the administrator password) can be obtained.
Products affected by CVE-2019-15799
- cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-24hp_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:*
- cpe:2.3:o:zyxel:gs1900-48hp_firmware:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-15799
2.08%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 89 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-15799
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
9.0
|
HIGH | AV:N/AC:L/Au:S/C:C/I:C/A:C |
8.0
|
10.0
|
NIST | |
8.8
|
HIGH | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
2.8
|
5.9
|
NIST |
CWE ids for CVE-2019-15799
-
The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-15799
-
https://vimeo.com/354726424
Vimeo / 403 ForbiddenExploit;Third Party Advisory
-
https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml
Zyxel security advisory for GS1900 switch vulnerabilities | ZyxelVendor Advisory
-
https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html
Exploring Zyxel GS1900 firmware with Ghidra - [ jasper.la ]Exploit;Third Party Advisory
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