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Advisories

Linksys Multiple Routers OS Command Injection

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severity
critical
date
Affecting

  • E-Series

  • WAG-Series

  • WAP-Series

  • WES-Series

  • WET-Series

  • WRT-Series

  • An affected version range remains undefined

CVE type
CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS
10
CVSS V4 Vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Credit
Johannes Ullrich of SANS Internet Storm Center
Description
An OS command injection vulnerability exists in various models of E-Series Linksys routers via the /tmUnblock.cgi and /hndUnblock.cgi endpoints over HTTP on port 8080. The CGI scripts improperly process user-supplied input passed to the ttcp_ip parameter without sanitization, allowing unauthenticated attackers to inject shell commands. This vulnerability is exploited in the wild by the "TheMoon" worm to deploy a MIPS ELF payload, enabling arbitrary code execution on the router. This vulnerability may affect other Linksys products to include, but not limited to, WAG/WAP/WES/WET/WRT-series router models and Wireless-N access points and routers. Exploitation evidence was observed by the Shadowserver Foundation on 2025-02-06 UTC.