Category: Vulnerabilities
Hits: 375
-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

### Device Details
Discovered By: Andrew Klaus (andrew@aklaus.ca)
Vendor: Actiontec (Telus Branded, but may work on other -----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

### Device Details
Discovered By: Andrew Klaus (andrew@aklaus.ca)
Vendor: Actiontec (Telus Branded, but may work on others)
Model: WEB6000Q
Affected Firmware: 1.1.02.22

Reported: Sept 2018
CVE: Not needed since update is pushed by the provider.



### Summary of Findings

The wireless extenders use DHCP Option 125 to include device details
such as model number, manufacturer, and serial number.

The WCB6000Q DHCP DISCOVER and REQUEST broadcasts include the device
serial number in the DHCP option 125 (subopt 2) field. An attacker on
the same Layer 2 network segment as the device, can see all these DHCP
requests with a packet capture.

Once he or she has this, the device’s admin web UI password can be
reset using the web UI “forgot password” page to reset to a known value.



### Mitigation
Do not use the serial number to initiate password resets.

The serial number has other internal uses in the Web UI, which means
there’s a higher chance of it being leaked over the network. By using a
different value, this risk can be mitigated since the reset value is
only used for that purpose.




-----BEGIN PGP SIGNATURE-----
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=GA42
-----END PGP SIGNATURE-----