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.

CVSS v3.0 9.8 CRITICAL
CVSS v2.0 10.0 HIGH

9.8^/10

CVSS v3.0 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

10.0^/10

CVSS v2.0 : HIGH

V2 Legend

Vector : AV:N/AC:L/Au:N/C:C/I:C/A:C

Exploitability : 10.0 / Impact : 10.0

Access Vector NETWORK

Access Complexity LOW

Authentication NONE

Confidentiality Impact COMPLETE

Integrity Impact COMPLETE

Availability Impact COMPLETE

References

Link	Resource
http://packetstormsecurity.com/files/153226/Dlink-DCS-1130-Command-Injection-CSRF-Stack-Overflow.html	Third Party Advisory VDB Entry
https://github.com/ethanhunnt/IoT_vulnerabilities/blob/master/Dlink_DCS_1130_security.pdf	Not Applicable Third Party Advisory
https://seclists.org/bugtraq/2019/Jun/8	Mailing List Third Party Advisory

Configurations

Configuration 1 (hide)

AND

cpe:2.3:o:dlink:dcs-1130_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:dlink:dcs-1130:-:*:*:*:*:*:*:*

Configuration 2 (hide)

AND

cpe:2.3:o:dlink:dcs-1100_firmware:-:*:*:*:*:*:*:*

cpe:2.3:h:dlink:dcs-1100:-:*:*:*:*:*:*:*

Information

Published : 2019-07-02 14:15

Updated : 2021-04-26 09:09

NVD link : CVE-2017-8415

Mitre link : CVE-2017-8415

JSON object : View

CWE

CWE-798

Use of Hard-coded Credentials

Products Affected

dlink

dcs-1130_firmware
dcs-1100_firmware
dcs-1100
dcs-1130

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9.8 /10