CVE-2019-15799
CVSS V2 High 9
CVSS V3 High 8.8
Description
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.
Overview
- CVE ID
- CVE-2019-15799
- Assigner
- cve@mitre.org
- Vulnerability Status
- Analyzed
- Published Version
- 2019-11-14T21:15:11
- Last Modified Date
- 2019-11-21T18:15:55
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-8_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aahh.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-8:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-8hp_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aahi.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-8hp:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-10hp_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aazi.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-10hp:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-16_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aahj.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-16:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-24e_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aahk.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-24e:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-24_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aahl.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-24:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-24hp_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aahm.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-24hp:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-48_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aahn.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-48:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:zyxel:gs1900-48hp_firmware:*:*:*:*:*:*:*:* | 1 | OR | 2.50\(aaho.0\)c0 | |
| cpe:2.3:h:zyxel:gs1900-48hp:-:*:*:*:*:*:*:* | 0 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:S/C:C/I:C/A:C
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- SINGLE
- Confidentiality Impact
- COMPLETE
- Integrity Impact
- COMPLETE
- Availability Impact
- COMPLETE
- Base Score
- 9
- Severity
- HIGH
- Exploitability Score
- 8
- Impact Score
- 10
CVSS Version 3
- Version
- 3.1
- Vector String
- CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 8.8
- Base Severity
- HIGH
- Exploitability Score
- 2.8
- Impact Score
- 5.9
References
| Reference URL | Reference Tags |
|---|---|
| https://www.zyxel.com/support/gs1900-switch-vulnerabilities.shtml | Vendor Advisory |
| https://jasper.la/exploring-zyxel-gs1900-firmware-with-ghidra.html | Exploit Third Party Advisory |
| https://vimeo.com/354726424 | Exploit Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2019-15799 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-15799 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-05-10 16:58:53 | Added to TrackCVE | |||
| 2022-12-04 06:24:24 | 2019-11-14T21:15Z | 2019-11-14T21:15:11 | CVE Published Date | updated |
| 2022-12-04 06:24:24 | 2019-11-21T18:15:55 | CVE Modified Date | updated | |
| 2022-12-04 06:24:24 | Analyzed | Vulnerability Status | updated |