CVE-2017-16923 : Security Advisory and Response

A vulnerability related to command injection has been discovered in app_data_center on various Shenzhen Tenda devices, allowing remote attackers to execute arbitrary OS commands.

Understanding CVE-2017-16923

This CVE identifies a command injection vulnerability in Shenzhen Tenda devices that can be exploited by unauthenticated remote attackers.

What is CVE-2017-16923?

The vulnerability allows attackers to execute arbitrary OS commands by manipulating the GET request of the cgi-bin/luci/usbeject?dev_name= endpoint from the LAN without authentication.

The Impact of CVE-2017-16923

Remote unauthenticated attackers can execute arbitrary OS commands on affected devices.
The vulnerability arises from the execution of system operations using untrusted input.

Technical Details of CVE-2017-16923

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in app_data_center on Shenzhen Tenda devices allows remote unauthenticated attackers to execute arbitrary OS commands via a crafted GET request.

Affected Systems and Versions

Shenzhen Tenda Ac9 US_AC9V1.0BR_V15.03.05.14_multi_TD01
Ac9 ac9_kf_V15.03.05.19(6318_)_cn
Ac15 US_AC15V1.0BR_V15.03.05.18_multi_TD01
Ac15 US_AC15V1.0BR_V15.03.05.19_multi_TD01
Ac18 US_AC18V1.0BR_V15.03.05.05_multi_TD01
Ac18 ac18_kf_V15.03.05.19(6318_)_cn

Exploitation Mechanism

The attack is conducted by manipulating the GET request of the cgi-bin/luci/usbeject?dev_name= endpoint from the LAN, exploiting the "sub_A6E8 usbeject_process_entry" function.

Mitigation and Prevention

Protecting systems from this vulnerability requires immediate actions and long-term security practices.

Immediate Steps to Take

Apply vendor-supplied patches or updates to fix the vulnerability.
Restrict network access to the affected devices.

Long-Term Security Practices

Regularly update firmware and software to address security flaws.
Implement network segmentation to limit the impact of potential attacks.
Conduct security assessments and penetration testing to identify and address vulnerabilities.
Educate users about safe browsing habits and the importance of cybersecurity.
Monitor network traffic for suspicious activities.

Patching and Updates

Check for security advisories from Shenzhen Tenda and apply patches promptly to mitigate the vulnerability.