| tiêu đề | Tomato Tomato Firmware Shibby-modified Tomato Firmware (MIPS32 LE). Verified on extracted image labeled d2e251333c486810d9bbce816021bcf1b93dd392 (inter OS Command Injection |
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| Mô tả | Authenticated web administrator can achieve root command execution via NVRAM key dhcpc_custom in /sbin/rc function start_dhcpc (0x41CA20). User input is copied without sanitization, embedded in snprintf, and executed as root via _xstart("/bin/sh", "-c", dest) at 0x41CDC0 when DHCP client starts (WAN connect, DHCP renew, exec_service).
CWE-78 (primary), CWE-121 (stack overflow in same function). CVSS 3.1: AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H = 7.2 HIGH.
Dynamic PoC: QEMU MIPS user-mode + firmware rootfs + LD_PRELOAD NVRAM shim; strace shows execve("/bin/sh", "-c", "...;touch /tmp/pwned_dhcpc;#") and proof file created.
Advisory: https://gitee.com/你的用户名/tomato-rc-nvram-cve/blob/master/advisories/en/01-start_dhcpc.md
Fix: use execve with argv for udhcpc (no shell); whitelist dhcpc_custom; bounded string copies. |
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| Nguồn | ⚠️ https://gitee.com/WH-YHUST/tomato-rc-nvram-cve/blob/master/gitee-cve-disclosure/advisories/en/01-start_dhcpc.md |
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| Người dùng | WH-YHUST (UID 98329) |
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| Đệ trình | 17/05/2026 09:15 (cách đây 21 ngày) |
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| Kiểm duyệt | 04/06/2026 17:32 (18 days later) |
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| Trạng thái | được chấp nhận |
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| Mục VulDB | 368360 [Shibby Tomato 1.28.0000 Web UI /sbin/rc start_dhcpc nâng cao đặc quyền] |
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| điểm | 20 |
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