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CVE-2016-6563: Processing malformed SOAP messages when performing the HNAP Login action causes a buffer overflow in the…

CVE-2016-6563 is rated critical with a CVSS v3.0 base score of 9.8 and NVD lists 9 affected products, including D-Link Dir 823 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

Processing malformed SOAP messages when performing the HNAP Login action causes a buffer overflow in the stack in some D-Link DIR routers. The vulnerable XML fields within the SOAP body are: Action, Username, LoginPassword, and Captcha. The following products are affected: DIR-823, DIR-822, DIR-818L(W), DIR-895L, DIR-890L, DIR-885L, DIR-880L, DIR-868L, and DIR-850L.

Severity breakdown

CVSS v3.0 9.8: CVSS:3.0/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-121: Stack-based Buffer Overflow

The product writes past the end of a buffer that was allocated on the stack.

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary.

Affected products

  • D-Link Dir 823 Firmware: all versions listed by NVD
  • D-Link Dir 822 Firmware: all versions listed by NVD
  • D-Link Dir 818l(W) Firmware: all versions listed by NVD
  • D-Link Dir 895l Firmware: all versions listed by NVD
  • D-Link Dir 890l Firmware: all versions listed by NVD
  • D-Link Dir 885l Firmware: all versions listed by NVD
  • D-Link Dir 880l Firmware: all versions listed by NVD
  • D-Link Dir 868l Firmware: all versions listed by NVD
  • D-Link Dir 850l Firmware: all versions listed by NVD

References