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CVE-2017-20204— DBLTek GoIP Telnet Admin Interface Undocumented Backdoor

Quick assessment

Affected
DBL Technology (DBLTek) GoIP
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

DBLTek GoIP是中国得伯乐（DBLTek）公司的一个语音网关设备。 DBLTek GoIP存在安全漏洞，该漏洞源于Telnet管理界面存在未记录的供应商后门，可能导致远程代码执行和设备完全控制。

AI Predicted 9.8 Difficulty: Easy EPSS 0.69% · P51
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I. Basic Information for CVE-2017-20204

Vulnerability Information
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Vulnerability Title
DBLTek GoIP Telnet Admin Interface Undocumented Backdoor
Source: CVE Program / CVE List V5
Vulnerability Description
DBLTek GoIP devices (models GoIP 1, 4, 8, 16, and 32) contain an undocumented vendor backdoor in the Telnet administrative interface that allows remote authentication as an undocumented user via a proprietary challenge–response scheme which is fundamentally flawed. Because the challenge response can be computed from the challenge itself, a remote attacker can authenticate without knowledge of a secret and obtain a root shell on the device. This can lead to persistent remote code execution, full device compromise, and arbitrary control of the device and any managed services. The firmware used within these devices was updated in December 2016 to make this vulnerability more complex to exploit. However, it is unknown if DBLTek has taken steps to fully mitigate.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1242
Source: CVE Program / CVE List V5
Vulnerability Title
DBLTek GoIP 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
DBLTek GoIP是中国得伯乐（DBLTek）公司的一个语音网关设备。 DBLTek GoIP存在安全漏洞，该漏洞源于Telnet管理界面存在未记录的供应商后门，可能导致远程代码执行和设备完全控制。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
DBL Technology (DBLTek) GoIP * -

II. Public POCs for CVE-2017-20204

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III. Intelligence Information for CVE-2017-20204

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Proof of Concept for CVE-2017-20204 (1)

IV. Related Vulnerabilities

Same vendor: DBL Technology (DBLTek)
Same weakness: CWE-1242

V. Comments for CVE-2017-20204

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