Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linksys | E1200 Firmware | 2.0.09 |
| Linksys | E1200 | - |
| Linksys | E2500 Firmware | 3.0.04 |
| Linksys | E2500 | - |
Related Weaknesses (CWE)
References
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625ExploitThird Party Advisory
- https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625ExploitThird Party Advisory
FAQ
What is CVE-2018-3953?
CVE-2018-3953 is a vulnerability with a CVSS score of 7.2 (HIGH). 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...
How severe is CVE-2018-3953?
CVE-2018-3953 has been rated HIGH with a CVSS base score of 7.2/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2018-3953?
Check the references section above for vendor advisories and patch information. Affected products include: Linksys E1200 Firmware, Linksys E1200, Linksys E2500 Firmware, Linksys E2500.