CVE-2017-20203
published 2025-10-09CVE-2017-20203: 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…
PriorityP184critical9.3CVSS 4.0
AVNACLATNPRNUIAVCHVIHVANSCHSIHSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUX
ITWVulnCheck KEV
Exploited in the wild
EPSS
0.61%
44.6th percentile
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.
Affected
5 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| netsarang_computer_inc | xftp | — | — |
| netsarang_computer_inc | xlpd | — | — |
| netsarang_computer_inc | xmanager | — | — |
| netsarang_computer_inc | xmanager_enterprise | — | — |
| netsarang_computer_inc | xshell | — | — |
CVSS provenance
nvdv4.09.3CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
vulncheck9.3CRITICAL
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GHSA
GHSA-grq9-x3r7-f44p: NetSarang Xmanager Enterprise 5
ghsa_unreviewed·2025-10-09
CVE-2017-20203 [CRITICAL] CWE-506 GHSA-grq9-x3r7-f44p: NetSarang Xmanager Enterprise 5
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 explo
VulnCheck
netsarang xftp Embedded Malicious Code
vulncheck·2017·CVSS 9.3
CVE-2017-20203 [CRITICAL] netsarang xftp Embedded Malicious Code
netsarang xftp Embedded Malicious Code
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. Kaspe
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
https://securelist.com/shadowpad-in-corporate-networks/81432/https://usa.kaspersky.com/about/press-releases/shadowpad-attackers-hid-backdoor-in-software-used-by-hundreds-of-large-companies-worldwidehttps://web.archive.org/web/20181022035109/https://www.netsarang.com/news/security_exploit_in_july_18_2017_build.htmlhttps://www.vulncheck.com/advisories/netsarang-malicious-backdoor-supply-chain-compromise
2025-10-09
Published
Exploited in the wild