Executive Summary

[{'type': 'paragraph', 'content': "CVE-2026-2823 is a command injection vulnerability found in the Comfast CF-E7 router version 2.6.0.9. It occurs in the web management component, specifically in the CGI script at /cgi-bin/mbox-config?method=SET&section=ntp_timezone. The vulnerability is triggered by manipulating the 'timestr' argument, which is not properly sanitized, allowing attackers to inject and execute arbitrary system commands on the device."}, {'type': 'paragraph', 'content': 'This flaw can be exploited remotely without authentication, making it accessible to attackers over the network. The vulnerability affects the confidentiality, integrity, and availability of the affected system by allowing unauthorized command execution.'}] [1, 2]

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Impact Analysis

This vulnerability allows remote attackers to execute arbitrary commands on the affected Comfast CF-E7 router, potentially compromising the device and the network it manages.

• Attackers can gain unauthorized control over the router.
• Confidentiality of network data can be breached.
• Integrity of the system can be compromised by unauthorized changes.
• Availability of network services may be disrupted.

Since the exploit is publicly available and requires no authentication, the risk of exploitation is high.

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Compliance Impact

I don't know

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Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by monitoring for specially crafted HTTP POST requests targeting the path `/cgi-bin/mbox-config?method=SET&section=ntp_timezone` on Comfast CF-E7 routers running version 2.6.0.9.'}, {'type': 'paragraph', 'content': 'Detection commands could include using network traffic analysis tools like tcpdump or Wireshark to filter HTTP POST requests to the vulnerable endpoint, for example:'}, {'type': 'list_item', 'content': "tcpdump -A -s 0 'tcp port 80 and (((ip[2:2] - ((ip[0]&0xf)<<2)) - ((tcp[12]&0xf0)>>2)) != 0)' | grep '/cgi-bin/mbox-config?method=SET&section=ntp_timezone'"}, {'type': 'list_item', 'content': 'Using curl or similar tools to test the endpoint manually by sending crafted POST requests with manipulated `timestr` parameters to check for command injection behavior.'}, {'type': 'paragraph', 'content': 'Additionally, monitoring authentication attempts and unusual command execution logs on the device may help identify exploitation attempts.'}] [1, 2]

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Mitigation Strategies

Immediate mitigation steps include restricting access to the vulnerable endpoint by implementing network-level controls such as firewall rules to block incoming requests to `/cgi-bin/mbox-config?method=SET&section=ntp_timezone`.

Since no vendor patch or official fix is available and the vendor did not respond, it is recommended to replace the affected Comfast CF-E7 device with a different product that is not vulnerable.

Additionally, monitoring the device for signs of compromise and disabling remote management features if possible can reduce exposure.

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