[FD] [CVE-2018-5767] Remote Code Execution Walkthrough on Tenda AC15 Router

[Kurtis <kurtis@xxxxxxxxxxxxxxxx>]

** Advisory Information

Title: [CVE-2018-5767] Remote Code Execution Walkthrough on Tenda AC15 Router
Blog URL: https://www.fidusinfosec.com/remote-code-execution-cve-2018-5767/
Vendor: Tenda
Date Published: 14/02/2018
CVE: CVE-2018-5767


** Vulnerability Summary

The vulnerability in question is caused by a buffer overflow due to unsanitised 
user input being passed directly to a call to sscanf.

** Vendor Response

Numerous attempts were made to contact the vendor with no success. Due to the 
nature of the vulnerability, offset's have been redacted from the post to 
prevent point and click exploitation.


** Report Timeline

Vulnerability discovered and first reported - 14/1/2018

Second attempt to make contact, further informing the vendor of the severity of 
the vulnerability - 18/1/2018

CVE's assigned by Mitre.org - 19/1/2018

Livechat attempt to contact vendor - 19/1/2018

Another attempt to contact vendor 23/1/2018

Further attempt to contact vendor, confirming 5 CVE's had been assigned to 
their product - 31/1/2018

Final contact attempted & warning of public disclosure - 8/2/2018

Public disclosure - 14/2/2018

** Credit

This vulnerability was discovered by Tim Carrington @__invictus_, part of the 
Fidus
Information Security research team.


** References

https://www.fidusinfosec.com/remote-code-execution-cve-2018-5767/


** Disclaimer

This advisory is licensed under a Creative Commons Attribution Non-Commercial
Share-Alike 3.0 License: http://creativecommons.org/licenses/by-nc-sa/3.0/


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