Podatność CVE-2017-8415


Publikacja: 2019-07-02

Opis:
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.

Typ:

CWE-798

CVSS2 => (AV:N/AC:L/Au:N/C:C/I:C/A:C)

Ogólna skala CVSS
Znaczenie
Łatwość wykorzystania
10/10
10/10
10/10
Wymagany dostęp
Złożoność ataku
Autoryzacja
Zdalny
Niska
Nie wymagana
Wpływ na poufność
Wpływ na integralność
Wpływ na dostępność
Pełny
Pełny
Pełny
Affected software
Dlink -> Dcs-1100 firmware 
Dlink -> Dcs-1130 firmware 

 Referencje:
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

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