VDB-145783 · CVE-2019-15801 · GCVE-0-2019-15801

ZyXEL GS1900 prior 2.50(AAHH.0)C0 libfds.so.0.0 fds_sys_passDebugPasswd_ret insufficiently protected credentials

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.
7.1	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in ZyXEL GS1900. Affected by this vulnerability is the function fds_sys_passDebugPasswd_ret of the file libfds.so.0.0. This manipulation causes insufficiently protected credentials. This vulnerability appears as CVE-2019-15801. The attack may be initiated remotely. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in ZyXEL GS1900. Affected by this vulnerability is the function fds_sys_passDebugPasswd_ret of the file libfds.so.0.0. The manipulation with an unknown input leads to a insufficiently protected credentials vulnerability. The CWE definition for the vulnerability is CWE-522. The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An issue was discovered on Zyxel GS1900 devices with firmware before 2.50(AAHH.0)C0. The firmware image contains encrypted passwords that are used to authenticate users wishing to access a diagnostics or password-recovery menu. Using the hardcoded cryptographic key found elsewhere in the firmware, these passwords can be decrypted. This is related to fds_sys_passDebugPasswd_ret() and fds_sys_passRecoveryPasswd_ret() in libfds.so.0.0.

The weakness was presented 11/14/2019 (Website). It is possible to read the advisory at zyxel.com. This vulnerability is known as CVE-2019-15801 since 08/29/2019. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1552 according to MITRE ATT&CK.

Upgrading to version 2.50(AAHH.0)C0 eliminates this vulnerability.

See VDB-145781, VDB-145782, VDB-145784 and VDB-145785 for similar entries. Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

ZyXEL

Name

GS1900

License

commercial

Website

Vendor: https://www.zyxel.com/

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.4
VulDB Meta Temp Score: 7.2

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

NVD Base Score: 7.5
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: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Insufficiently protected credentials
CWE: CWE-522
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: GS1900 2.50(AAHH.0)C0

Timelineinfo

08/29/2019 🔍
11/14/2019 +77 days 🔍
11/15/2019 +1 days 🔍
11/15/2019 +0 days 🔍

Sourcesinfo

Vendor: zyxel.com

Advisory: zyxel.com
Status: Not defined

CVE: CVE-2019-15801 (🔍)
GCVE (CVE): GCVE-0-2019-15801
GCVE (VulDB): GCVE-100-145783
See also: 🔍

Entryinfo

Created: 11/15/2019 11:19
Updated: 11/15/2019 11:24
Changes: 11/15/2019 11:19 (41), 11/15/2019 11:24 (17)
Complete: 🔍
Cache ID: 216::103