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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
The Grandstream GXV3275 is an Android-based VoIP phone. Several
vulnerabilities were found affecting this device.

* The device ships with a default root SSH key, which could be used as a
backdoor:

/system/root/.ssh # cat authorized_keys
Public key portion is:
ssh-rsa
AAAAB3NzaC1yc2EAAAADAQABAAAAgwCIcYbgmdHTpTeDcBA4IOg5Z7d2By0GXGihZzcTxZC+YTWGUe/HJc+pYDpDrGMWg0hMqd+JPs1GaLNw4pw0Mip6VMT7VjoZ8Z+n2ULNyK1IoTU4C3Ea4vcYVR8804Pvh9vXxC0iuMEr1Jx7SewUwSlABX04uVpEObgnUhpi+hn/H34/
jhzhao@jhzhao-Lenovo
Fingerprint: md5 7b:6e:a0:00:19:54:a6:39:84:1f:f9:18:2e:79:61:b5

This issue has not been resolved.

* The SSH interface only provides access to a limited CLI. The CLI's ping
and traceroute commands will pass user input as parameters to underlying
system commands without escaping shell metacharacters. This can be
exploited to break out to a shell:

GXV3275 > traceroute $(sh)

This shell will only see stderr, so we then need to run sh with stdout
redirected to stderr:

sh 1>&2

This issue has been resolved in firmware version 1.0.3.30.

* The web interface exposes an undocumented command execution API:


http://DEVICEIP/manager?action=execcmd&command=echo%20%22hello%22%20%3E%20/system/root/test.txt

This issue has been resolved in firmware version 1.0.3.30.

* The web interface allows unprivileged users to escalate privileges by
modifying a cookie on the client side:

javascript:void(document.cookie="type=admin")

Full details are available here:

http://davidjorm.blogspot.com/2015/07/101-ways-to-pwn-phone.html

MITRE was contacted repeatedly requesting CVE names for these issues, but
never replied.

David