| 标题 | Tomato Tomato by Shibby 1.28.0000 MIPSR2-124 K26 Mini (tomato-K26-1.28.RT-MIPSR2-124-Mini.trx, release build5x-124-EN, 2014-12-24). Likely affects other OS Command Injection (CWE-78, post-authentication) |
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| 描述 | The router service binary /sbin/rc reads 25+ administrator-writable NVRAM keys in function new_qoslimit_start (offset 0x42419C, 2640 bytes). All values — including wan_iface (6 occurrences), qos_ibw, qos_obw, qosl_dlr/dlc/ulr/ulc, limit_br1~3_* (15 keys), and new_qoslimit_rules — are embedded via fprintf without any sanitization into a #!/bin/sh shell script /etc/qoslimit. The script is chmod 0700, then executed as root through eval() → fork+execvp at 0x424BB0 when QoS bandwidth limiting starts (WAN connect via start_wan_done, or service restart via exec_service).
An authenticated web administrator can inject shell metacharacters into any of these NVRAM keys. Impact is full root compromise (C/I/A). Attack surface is extremely wide (25+ injection points). NVRAM values persist across reboots, and the exploit re-triggers automatically on WAN establishment.
Dynamic verification: QEMU MIPS user-mode, original firmware rootfs, LD_PRELOAD NVRAM shim, bwrap sandbox, strace confirms write(692) → chmod(0700) → fork(), proof file /tmp/pwned_qoslimit_start created. |
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| 来源 | ⚠️ https://gitee.com/WH-YHUST/tomato-rc-qos-ppp-cve/blob/master/advisories/en/02-new_qoslimit_start.md |
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| 用户 | WH-YHUST (UID 98329) |
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| 提交 | 2026-06-19 11時56分 (2 月前) |
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| 管理 | 2026-08-06 07時47分 (2 months later) |
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| 状态 | 已接受 |
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| VulDB条目 | 386454 [Shibby Tomato 1.28.0000 /etc/qoslimit new_qoslimit_start new_qoslimit_enable 权限提升] |
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| 积分 | 20 |
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