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.
Products affected by CVE-2017-8415
- cpe:2.3:o:dlink:dcs-1130_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:o:dlink:dcs-1100_firmware:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2017-8415
0.41%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 74 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2017-8415
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
10.0
|
HIGH | AV:N/AC:L/Au:N/C:C/I:C/A:C |
10.0
|
10.0
|
NIST | |
9.8
|
CRITICAL | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
3.9
|
5.9
|
NIST |
CWE ids for CVE-2017-8415
-
The product contains hard-coded credentials, such as a password or cryptographic key.Assigned by: nvd@nist.gov (Primary)
References for CVE-2017-8415
-
https://seclists.org/bugtraq/2019/Jun/8
Bugtraq: Newly releases IoT security issuesMailing List;Third Party Advisory
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https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Dlink_DCS_1130_security.pdf
IoT_vulnerabilities/Dlink_DCS_1130_security.pdf at master · ethanhunnt/IoT_vulnerabilities · GitHubNot Applicable;Third Party Advisory
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http://packetstormsecurity.com/files/153226/Dlink-DCS-1130-Command-Injection-CSRF-Stack-Overflow.html
Dlink DCS-1130 Command Injection / CSRF / Stack Overflow ≈ Packet StormThird Party Advisory;VDB Entry
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