Description
Devices in the Linksys ESeries line of routers (Linksys E1200 Firmware Version 2.0.09 and Linksys E2500 Firmware Version 3.0.04) are susceptible to OS command injection vulnerabilities due to improper filtering of data passed to and retrieved from NVRAM. Data entered into the 'Router Name' input field through the web portal is submitted to apply.cgi as the value to the 'machine_name' POST parameter. When the 'preinit' binary receives the SIGHUP signal, it enters a code path that continues until it reaches offset 0x0042B5C4 in the 'start_lltd' function. Within the 'start_lltd' function, a 'nvram_get' call is used to obtain the value of the user-controlled 'machine_name' NVRAM entry. This value is then entered directly into a command intended to write the host name to a file and subsequently executed.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linksys | ESeries E1200 | Firmware Version 2.0.09 | — |
| Linksys | ESeries E2500 | Firmware Version 3.0.04 | — |
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Metasploit 2 modules
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Linksys E1500/E2500 apply.cgi Remote Command Injection
exploit/linux/http/linksys_e1500_apply_exec
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Linksys E1500/E2500 Remote Command Execution
auxiliary/admin/http/linksys_e1500_e2500_exec
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.