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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.

PUBLISHED Reserved 2025-10-08 | Published 2025-10-09 | Updated 2025-10-09 | Assigner VulnCheck




CRITICAL: 9.3CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N

Problem types

CWE-506 Embedded Malicious Code

Product status

Default status
unaffected

5.0 Build 1232
affected

Default status
unaffected

5.0 Build 1045
affected

Default status
unaffected

5.0 Build 1322
affected

Default status
unaffected

5.0 Build 1218
affected

Default status
unaffected

5.0 Build 1220
affected

Credits

Kaspersky Lab finder

References

web.archive.org/...curity_exploit_in_july_18_2017_build.html vendor-advisory patch

usa.kaspersky.com/...y-hundreds-of-large-companies-worldwide technical-description

securelist.com/shadowpad-in-corporate-networks/81432/ technical-description

www.vulncheck.com/...icious-backdoor-supply-chain-compromise third-party-advisory

cve.org (CVE-2017-20203)

nvd.nist.gov (CVE-2017-20203)

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