Vulnerability identifier: #VU22869

Vulnerability risk: High

CVSSv3.1: 8.8 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2018-17564

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
GXP1610
Hardware solutions / Routers & switches, VoIP, GSM, etc
GXP1615
Hardware solutions / Routers & switches, VoIP, GSM, etc
GXP1620
Hardware solutions / Routers & switches, VoIP, GSM, etc
GXP1625
Hardware solutions / Routers & switches, VoIP, GSM, etc
GXP1628
Hardware solutions / Routers & switches, VoIP, GSM, etc
GXP1630
Hardware solutions / Routers & switches, VoIP, GSM, etc
Grandstream Basic IP Phones firmware
Hardware solutions / Firmware

Vendor: Grandstream Networks, Inc.

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to the "/app/war/cgi-bin/delete_CA" haserl script does not require authentication and permits to delete a previously uploaded CA certificate. A remote attacker can delete configuration parameters and gain admin access to the device.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

GXP1610: All versions

GXP1615: All versions

GXP1620: All versions

GXP1625: All versions

GXP1628: All versions

GXP1630: All versions

Grandstream Basic IP Phones firmware: 1.0.1.10 - 1.0.4.128

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External links
http://grandstream.com/support/firmware
http://iridiumxor.wordpress.com/2019/01/03/three-simple-cves-for-a-good-voip-phone/

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.