CVE-2017-8415

Sažetak

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.

Reference

CVSS

Base:	10.0
Impact:	10.0
Exploitability:	10.0

Pristup

Vektor	Složenost	Autentikacija
NETWORK	LOW	NONE

Impact

Povjerljivost	Cjelovitost	Dostupnost
COMPLETE	COMPLETE	COMPLETE

CVSS vektor

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

Zadnje važnije ažuriranje

26-04-2021 - 16:09

Objavljeno

02-07-2019 - 21:15