Gửi #673138: dnsmasq dnsmasq v2.73rc6 Heap-based Buffer Overflowthông tin

tiêu đềdnsmasq dnsmasq v2.73rc6 Heap-based Buffer Overflow
Mô tảA heap buffer overflow exists in dnsmasq v2.73rc6 when parsing DHCP option hexadecimal values. The vulnerability is in `parse_hex()` (src/util.c) which can write past the end of the allocated buffer (callers allocate based on a computed byte count). A crafted DHCP option in `dnsmasq.conf` causes `parse_hex()` to overflow the heap buffer during configuration parsing, resulting in a crash and potential memory corruption. Reproduce by replacing `dnsmasq.conf` with the supplied config and starting dnsmasq; an ASan build produces a reliable crash referencing `parse_hex`.
Nguồn⚠️ https://shimo.im/docs/1d3aMVMmNmiLjg3g/
Người dùng
 zh_vul (UID 91488)
Đệ trình11/10/2025 05:30 (cách đây 12 các tháng)
Kiểm duyệt25/10/2025 08:22 (14 days later)
Trạng tháiđược chấp nhận
Mục VulDB329868 [dnsmasq đến 2.73rc6 Config File src/util.c parse_hex i tràn bộ đệm]
điểm20

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