| タイトル | Tomato by Shibby Tomato Firmware Tomato v1.28 RT-N5x MIPSR2 build 132 Max Stack-based Buffer Overflow |
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| 説明 | sub_407220 renders DNS server information into a JavaScript array. It allocates a fixed 128-byte stack buffer and appends each DNS entry with sprintf(&buf[strlen(buf)], ...) in a loop. The number of entries is taken from get_dns(), and the function does not verify that the accumulated string still fits in the destination buffer.
char buf[128];
dns = get_dns();
strcpy(buf, "\ndns = [");
for (i = 0; i < dns[0]; ++i) {
size_t len = strlen(buf);
char *ip = inet_ntoa((struct in_addr)dns[2 * i + 1]);
sprintf(&buf[len], "%s'%s:%u'", i ? "," : "", ip, port);
}
strcat(buf, "];\n");
web_puts(buf);
With 8 ordinary DNS entries, the generated string reaches approximately 146 bytes before the final NUL terminator, exceeding the 128-byte stack buffer. |
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| ソース | ⚠️ https://gitee.com/Fengyi-Wang/CVE/issues/IJTQ5R |
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| ユーザー | Cormac315 (UID 97273) |
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| 送信 | 2026年06月10日 16:08 (1 月 ago) |
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| モデレーション | 2026年07月12日 23:01 (1 month later) |
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| ステータス | 承諾済み |
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| VulDBエントリ | 377898 [Shibby Tomato 迄 1.28.0000 DNS List Rendering /usr/sbin/httpd sub_407220 メモリ破損] |
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| ポイント | 20 |
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