Vulnerability Details CVE-2017-8415
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.029
EPSS Ranking 85.8%
CVSS Severity
CVSS v3 Score 9.8
CVSS v2 Score 10.0
References
- http://packetstormsecurity.com/files/153226/Dlink-DCS-1130-Command-Injection-CSRF-Stack-Overflow.html
- https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Dlink_DCS_1130_security.pdf
- https://seclists.org/bugtraq/2019/Jun/8
- http://packetstormsecurity.com/files/153226/Dlink-DCS-1130-Command-Injection-CSRF-Stack-Overflow.html
- https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Dlink_DCS_1130_security.pdf
- https://seclists.org/bugtraq/2019/Jun/8
Products affected by CVE-2017-8415
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cpe:2.3:h:dlink:dcs-1100:-
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cpe:2.3:h:dlink:dcs-1130:-
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cpe:2.3:o:dlink:dcs-1100_firmware:-
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cpe:2.3:o:dlink:dcs-1130_firmware:-