RCE in Linksys E1200
CVE-2018-3954
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 NVRAMData 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 calls a function named 'set_host_domain_name' from its libshared.so shared object.
Vulnerability class: Command Injection (OS Command Injection)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.034 (88.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 88th percentile — 88.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.034 · newest: 0.034 · change: 0.000
Affected products
- Linksys E1200
- Linksys E1200 Firmware — versions 2.0.09
- Linksys E2500
- Linksys E2500 Firmware — versions 3.0.04
- Linksys Eseries E1200 — versions Firmware Version 2.0.09
- Linksys Eseries E2500 — versions Firmware Version 3.0.04
Weakness classification (CWE)
References
- talosintelligence.com/vulnerability_reports/TALOS-2018-0625 (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2018-3954?
- CVE-2018-3954 is a high-severity vulnerability in Linksys E1200, classified under OS Command Injection. CVSS score: 7.2/10. Published 2018-10-17.
- How severe is CVE-2018-3954?
- High severity. CVSS v3 base score is 7.2 out of 10.