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TalosCVE-2018-3953

HistoryOct 17, 2018 - 2:29 a.m.

CVE-2018-3953

2018-10-1702:29:01

CWE-78

talos

web.nvd.nist.gov

linksys

eseries

routers

firmware

vulnerability

os command injection

cve-2018-3953

nvram

web portal

apply.cgi

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS3

7.2

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

AI Score

7.5

Confidence

High

EPSS

0.002

Percentile

58.8%

JSON

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.

Affected configurations

Nvd

Vulners

Node

linksyse1200_firmwareMatch2.0.09

AND

linksyse1200Match-

Node

linksyse2500_firmwareMatch3.0.04

AND

linksyse2500Match-

VendorProductVersionCPE
linksyse1200_firmware2.0.09cpe:2.3:o:linksys:e1200_firmware:2.0.09:*:*:*:*:*:*:*
linksyse1200-cpe:2.3:h:linksys:e1200:-:*:*:*:*:*:*:*
linksyse2500_firmware3.0.04cpe:2.3:o:linksys:e2500_firmware:3.0.04:*:*:*:*:*:*:*
linksyse2500-cpe:2.3:h:linksys:e2500:-:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linksys	e1200_firmware	2.0.09	cpe:2.3:o:linksys:e1200_firmware:2.0.09:::::::*
linksys	e1200	-	cpe:2.3:h:linksys:e1200:-:::::::*
linksys	e2500_firmware	3.0.04	cpe:2.3:o:linksys:e2500_firmware:3.0.04:::::::*
linksys	e2500	-	cpe:2.3:h:linksys:e2500:-:::::::*

CNA Affected

[
  {
    "product": "ESeries E1200",
    "vendor": "Linksys",
    "versions": [
      {
        "status": "affected",
        "version": "Firmware Version 2.0.09"
      }
    ]
  },
  {
    "product": "ESeries E2500",
    "vendor": "Linksys",
    "versions": [
      {
        "status": "affected",
        "version": "Firmware Version 3.0.04"
      }
    ]
  }
]

References

talosintelligence.com/vulnerability_reports/TALOS-2018-0625

CVSS2

Attack Vector

NETWORK

Attack Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:L/Au:S/C:C/I:C/A:C

CVSS3

7.2

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

HIGH

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

AI Score

7.5

Confidence

High

EPSS

0.002

Percentile

58.8%

JSON

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