| Title | D-Link DI-7100G C1, 24.04.18D1 Command Injection |
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| Description | A command injection vulnerability exists in D-Link DI-7100G routers running firmware versions C1 (updated on 2020/02/21) and 24.04.18D1 (updated on 2024/04/18). The vulnerability is located in the set_jhttpd_info function. Specifically, the program constructs a shell command using sprintf(v24, "echo \"%s = %s\" > /etc/smbusers", "smbguest", def); and subsequently executes it via system(v24);.
Within this function, the value of the usb_username configuration item is retrieved using jhl_nv_get_def("usb_username") and directly concatenated into the echo command without proper sanitization. If an attacker can modify the usb_username field in the configuration file to include malicious command payloads (e.g., $(mkdir /aaa)login), the injected commands will be executed when the device boots or when the vulnerable function is triggered, potentially resulting in arbitrary command execution and full device compromise. |
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| Source | ⚠️ https://github.com/glkfc/IoT-Vulnerability/blob/main/D-Link/Dlink_4.md |
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| User | jfkk (UID 79868) |
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| Submission | 01/31/2026 15:39 (2 months ago) |
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| Moderation | 02/07/2026 18:33 (7 days later) |
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| Status | Accepted |
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| VulDB entry | 344896 [D-Link DI-7100G C1 24.04.18D1 set_jhttpd_info usb_username command injection] |
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| Points | 20 |
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