OS Command Injection Vulnerability in Linksys ESeries Routers
CVE-2018-3953

7.2HIGH

Key Information:

Vendor

Linksys
Status
Eseries E1200
Eseries E2500
Vendor
CVE Published:
17 October 2018

What is CVE-2018-3953?

Linksys ESeries routers have a vulnerability that allows OS command injection through improper filtering of user inputs. Specifically, the issue arises when data entered into the 'Router Name' field via the web portal is mishandled in the backend process. When the 'preinit' binary receives a SIGHUP signal, it processes a user-controlled NVRAM entry that determines the hostname. This value is subsequently executed in a command that writes to a file, posing a significant security risk as it can be leveraged by attackers to execute arbitrary commands on the router.

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Affected Version(s)

ESeries E1200 Firmware Version 2.0.09

ESeries E2500 Firmware Version 3.0.04

References

https://talosintelligence.com/vulnerability_reports/TALOS...
x_refsource_MISC

EPSS Score

68% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
7.2
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
High
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

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