CVE-2017-8415
Severity CVSS v4.0:
Pending analysis
Type:
CWE-798
Use of Hard-coded Credentials
Publication date:
02/07/2019
Last modified:
26/04/2021
Description
An issue was discovered on D-Link DCS-1100 and DCS-1130 devices. The device has a custom telnet daemon as a part of the busybox and retrieves the password from the shadow file using the function getspnam at address 0x00053894. Then performs a crypt operation on the password retrieved from the user at address 0x000538E0 and performs a strcmp at address 0x00053908 to check if the password is correct or incorrect. However, the /etc/shadow file is a part of CRAM-FS filesystem which means that the user cannot change the password and hence a hardcoded hash in /etc/shadow is used to match the credentials provided by the user. This is a salted hash of the string "admin" and hence it acts as a password to the device which cannot be changed as the whole filesystem is read only.
Impact
Base Score 3.x
9.80
Severity 3.x
CRITICAL
Base Score 2.0
10.00
Severity 2.0
HIGH
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:o:dlink:dcs-1130_firmware:-:*:*:*:*:*:*:* | ||
| cpe:2.3:h:dlink:dcs-1130:-:*:*:*:*:*:*:* | ||
| cpe:2.3:o:dlink:dcs-1100_firmware:-:*:*:*:*:*:*:* | ||
| cpe:2.3:h:dlink:dcs-1100:-:*:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page