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CVE-2018-3953

Published: Oct 17, 2018Updated: Nov 21, 2024 Sources: CVE List NVD BDUCWE-78
NVD MITRE
7.2CVSSHIGH
EPSS Score
13.3%
Top 4.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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 Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-78

Affected Products

e1200 firmwarelinksysNetworking Infrastructure
e2500 firmwarelinksysNetworking Infrastructure
ESeries E1200LinksysNetworking Infrastructure
ESeries E2500LinksysNetworking Infrastructure
Linksys E1200Cisco Systems Inc.
On-prem
Networking Infrastructure / router-switch
linksyscommercialUSNetworking Infrastructureaka linksys by cisco
cisco systems inc.commercialUSNetworking Infrastructureaka cisco systems, cisco
and 1 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625
talosintelligence.com
https://www.checkpoint.com/defense/advisories/public/2019/cpai-2018-1073.html
checkpoint.com

Timeline

Published
Oct 17, 2018
Last Updated
Nov 21, 2024

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