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CVE-2018-10824: An attacker having a directory traversal (or LFI) can easily get full router access.

CVE-2018-10824 is rated critical with a CVSS v3.1 base score of 9.8 and NVD lists 8 affected products, including D-Link Dwr 116 Firmware. Per its scoring, it can be exploited over the network, without authentication, without any user interaction. The scored impact on confidentiality, integrity and availability is the highest available.

Vulnerability description

An issue was discovered on D-Link DWR-116 through 1.06, DIR-140L through 1.02, DIR-640L through 1.02, DWR-512 through 2.02, DWR-712 through 2.02, DWR-912 through 2.02, DWR-921 through 2.02, and DWR-111 through 1.01 devices. The administrative password is stored in plaintext in the /tmp/csman/0 file. An attacker having a directory traversal (or LFI) can easily get full router access.

Severity breakdown

CVSS v3.1 9.8: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Network. Exploitable remotely over the network, with no need for local or physical access.
  • Attack complexity: Low. No special conditions; the attack can be repeated reliably.
  • Privileges required: None. No account or prior access is needed.
  • User interaction: None. No action from any user is needed.
  • Scope: Unchanged. Impact stays within the vulnerable component.
  • Confidentiality impact: High. Total loss of confidentiality; sensitive data can be fully disclosed.
  • Integrity impact: High. Total loss of integrity; data or system state can be fully modified.
  • Availability impact: High. Total loss of availability; the component can be shut down.

Underlying weakness

CWE-22: Improper Limitation of a Pathname to a Restricted Directory

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

CWE-522: Insufficiently Protected Credentials

The product transmits or stores authentication credentials, but it uses an insecure method that is susceptible to unauthorized interception and/or retrieval.

Affected products

  • D-Link Dwr 116 Firmware: up to and including 1.06
  • D-Link Dir 140l Firmware: up to and including 1.02
  • D-Link Dir 640l Firmware: up to and including 1.02
  • D-Link Dwr 512 Firmware: up to and including 2.02
  • D-Link Dwr 712 Firmware: up to and including 2.02
  • D-Link Dwr 912 Firmware: up to and including 2.02
  • D-Link Dwr 921 Firmware: up to and including 2.02
  • D-Link Dwr 111 Firmware: up to and including 1.01

References