CVE-2018-3953
CVSS V2 High 9
CVSS V3 High 7.2
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.
Overview
- CVE ID
- CVE-2018-3953
- Assigner
- talos-cna@cisco.com
- Vulnerability Status
- Undergoing Analysis
- Published Version
- 2018-10-17T02:29:01
- Last Modified Date
- 2022-04-19T18:15:28
Weakness Enumerations
CPE Configuration (Product)
| CPE | Vulnerable | Operator | Version Start | Version End |
|---|---|---|---|---|
| AND | ||||
| cpe:2.3:o:linksys:e1200_firmware:2.0.09:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:h:linksys:e1200:-:*:*:*:*:*:*:* | 0 | OR | ||
| AND | ||||
| cpe:2.3:o:linksys:e2500_firmware:3.0.04:*:*:*:*:*:*:* | 1 | OR | ||
| cpe:2.3:h:linksys:e2500:-:*:*:*:*:*:*:* | 0 | OR |
CVSS Version 2
- Version
- 2.0
- Vector String
- AV:N/AC:L/Au:S/C:C/I:C/A:C
- Access Vector
- NETWORK
- Access Compatibility
- LOW
- Authentication
- SINGLE
- Confidentiality Impact
- COMPLETE
- Integrity Impact
- COMPLETE
- Availability Impact
- COMPLETE
- Base Score
- 9
- Severity
- HIGH
- Exploitability Score
- 8
- Impact Score
- 10
CVSS Version 3
- Version
- 3.0
- Vector String
- CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Attack Vector
- NETWORK
- Attack Compatibility
- LOW
- Privileges Required
- HIGH
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality Impact
- HIGH
- Availability Impact
- HIGH
- Base Score
- 7.2
- Base Severity
- HIGH
- Exploitability Score
- 1.2
- Impact Score
- 5.9
References
| Reference URL | Reference Tags |
|---|---|
| https://talosintelligence.com/vulnerability_reports/TALOS-2018-0625 | Exploit Third Party Advisory |
Sources
| Source Name | Source URL |
|---|---|
| NIST | https://nvd.nist.gov/vuln/detail/CVE-2018-3953 |
| MITRE | https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-3953 |
History
| Created | Old Value | New Value | Data Type | Notes |
|---|---|---|---|---|
| 2022-04-20 17:01:24 | Added to TrackCVE | |||
| 2022-12-03 13:32:30 | 2018-10-17T02:29Z | 2018-10-17T02:29:01 | CVE Published Date | updated |
| 2022-12-03 13:32:30 | 2022-04-19T18:15:28 | CVE Modified Date | updated | |
| 2022-12-03 13:32:30 | Undergoing Analysis | Vulnerability Status | updated |