National Vulnerability Database

National Vulnerability Database

National Vulnerability
Database

CVE-2018-3953 Detail

Current 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.

Source:  MITRE
Description Last Modified:  10/16/2018
View Analysis Description

Impact

CVSS v3.0 Severity and Metrics:

Base Score: 7.2 HIGH
Vector: AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H (V3 legend)
Impact Score: 5.9
Exploitability Score: 1.2


Attack Vector (AV): Network
Attack Complexity (AC): Low
Privileges Required (PR): High
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

CVSS v2.0 Severity and Metrics:

Base Score: 9.0 HIGH
Vector: (AV:N/AC:L/Au:S/C:C/I:C/A:C) (V2 legend)
Impact Subscore: 10.0
Exploitability Subscore: 8.0


Access Vector (AV): Network
Access Complexity (AC): Low
Authentication (AU): Single
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete
Additional Information:
Allows unauthorized disclosure of information
Allows unauthorized modification
Allows disruption of service

References to Advisories, Solutions, and Tools

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Hyperlink Resource
https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625 Exploit Third Party Advisory

Technical Details

Vulnerability Type (View All)

  • OS Command Injections (CWE-78)

Known Affected Software Configurations Switch to CPE 2.2

Configuration 1 ( hide )
 cpe:2.3:o:linksys:e1200_firmware:2.0.09:*:*:*:*:*:*:*
     Show Matching CPE(s)
Running on/with
 cpe:2.3:h:linksys:e1200:-:*:*:*:*:*:*:*
     Show Matching CPE(s)

Configuration 2 ( hide )
 cpe:2.3:o:linksys:e2500_firmware:3.0.04:*:*:*:*:*:*:*
     Show Matching CPE(s)
Running on/with
 cpe:2.3:h:linksys:e2500:-:*:*:*:*:*:*:*
     Show Matching CPE(s)


Change History

1 change record found - show changes

Quick Info

CVE Dictionary Entry:
CVE-2018-3953
NVD Published Date:
10/16/2018
NVD Last Modified:
01/23/2019