CVE-2017-20203— NetSarang v5.0 Malicious Backdoor Supply Chain Compromise
Quick assessment
Affected
NetSarang Computer, Inc. Xmanager Enterprise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
NetSarang Xshell等都是美国NetSarang公司的产品。NetSarang Xshell是NetSarang Xmanager是一个功能强大、方便的 PC X 服务器软件包。NetSarang XLPD是远程打印工具。 NetSarang多款产品存在安全漏洞，该漏洞源于恶意nssock2.dll实现基于DNS的多阶段后门，可能导致远程代码执行和数据渗漏。以下产品及版本受到影响：NetSarang Xmanager Enterprise 5.0 Build 1232版本、Xmanager 5
Possible ATT&CK Techniques 3 AI
T1059 · Command and Scripting Interpreter T1071.004 · DNS T1571 · Non-Standard Port
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I. Basic Information for CVE-2017-20203
Vulnerability Information
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Vulnerability Title
NetSarang v5.0 Malicious Backdoor Supply Chain Compromise
Source: CVE Program / CVE List V5
Vulnerability Description
NetSarang Xmanager Enterprise 5.0 Build 1232, Xmanager 5.0 Build 1045, Xshell 5.0 Build 1322, Xftp 5.0 Build 1218, and Xlpd 5.0 Build 1220 contain a malicious nssock2.dll that implements a multi-stage, DNS-based backdoor. The dormant library contacts a C2 DNS server via a specially crafted TXT record for a month‑generated domain. After receiving a decryption key, it then downloads and executes arbitrary code, creates an encrypted virtual file system (VFS) in the registry, and grants the attacker full remote code execution, data exfiltration, and persistence. NetSarang released builds for each product line that remediated the compromise: Xmanager Enterprise Build 1236, Xmanager Build 1049, Xshell Build 1326, Xftp Build 1222, and Xlpd Build 1224. Kaspersky Lab identified an instance of exploitation in the wild in August 2017.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
内嵌的恶意代码
Source: CVE Program / CVE List V5
Vulnerability Title
NetSarang多款产品 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NetSarang Xshell等都是美国NetSarang公司的产品。NetSarang Xshell是NetSarang Xmanager是一个功能强大、方便的 PC X 服务器软件包。NetSarang XLPD是远程打印工具。 NetSarang多款产品存在安全漏洞，该漏洞源于恶意nssock2.dll实现基于DNS的多阶段后门，可能导致远程代码执行和数据渗漏。以下产品及版本受到影响：NetSarang Xmanager Enterprise 5.0 Build 1232版本、Xmanager 5
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| NetSarang Computer, Inc. | Xmanager Enterprise | 5.0 Build 1232 | - |
|
| NetSarang Computer, Inc. | Xmanager | 5.0 Build 1045 | - |
|
| NetSarang Computer, Inc. | Xshell | 5.0 Build 1322 | - |
|
| NetSarang Computer, Inc. | Xftp | 5.0 Build 1218 | - |
|
| NetSarang Computer, Inc. | Xlpd | 5.0 Build 1220 | - |
|
II. Public POCs for CVE-2017-20203
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2017-20203 (1)
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NetSarang v5.0 Malicious Backdoor Supply Chain Compromise | Advisories | VulnCheck third-party-advisory
Exploits & Public PoCs for CVE-2017-20203 (1)
Security Blog Posts for CVE-2017-20203 (1)
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ShadowPad in corporate networks | Securelist technical-description
News Coverage for CVE-2017-20203 (1)
IV. Related Vulnerabilities
Same weakness: CWE-506
V. Comments for CVE-2017-20203
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