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Advisories

Linksys Multiple Routers OS Command Injection

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severity
critical
date
Affecting

  • E4200 >= 0, < 1.0.06

  • E3200 >= 0, < 1.0.05

  • E3000 >= 0, < 1.0.06

  • E2500 v1/v2 >= 0, < 2.0.00

  • E2100L v1 <= 1.0.05

  • E2000

  • E1550 <= 1.0.03

  • E1500 v1 >= 0, < 1.0.06

  • E1200 v1 <= 1.0.04

  • E1000 v1 >= 0, < 2.1.03

  • E900 v1 >= 0, < 1.0.04

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 was reported to be exploited in the wild by the "TheMoon" worm in 2014 to deploy a MIPS ELF payload, enabling arbitrary code execution on the router. Additionally, 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.

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