CVE-2017-8415: dlink dcs-1100_firmware Use of Hard-coded Credentials

Vulnerability summary

CVE-2017-8415 is a high (CVSS 10.0) Use of Hard-coded Credentials vulnerability in dlink dcs-1100_firmware. EPSS estimates a 3.93% chance of exploitation in the next 30 days, higher than 90.2% of scored vulnerabilities.

Timeline

1. 02-07-2019
   PublishedVulnerability first disclosed.
2. 05-08-2024
   Last modifiedVulnerability information updated.

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.

• CWE-798Use of Hard-coded CredentialsThe product contains hard-coded credentials, such as a password or cryptographic key.