RCE in Linksys E1200
CVE-2018-3955
An exploitable operating system command injection exists in the Linksys ESeries line of routers (Linksys E1200 Firmware Version 2.0.09 and Linksys E2500 Firmware Version 3.0.04). Specially crafted entries to network configuration information can cause execution of arbitrary system commands, resulting in full control of the device. An attacker can send an authenticated HTTP request to trigger this vulnerability. Data entered into the 'Domain Name' input field through the web portal is submitted to apply.cgi as the value to the 'wan_domain' POST parameter. The wan_domain data goes through the nvram_set process described above. 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: 0.048 (91.7th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 92nd percentile — 91.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.048 · newest: 0.048 · 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-2018-3955?
- CVE-2018-3955 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-2018-3955?
- High severity. CVSS v3 base score is 7.2 out of 10.