CVE-2026-48686— FastNetMon 安全漏洞

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FastNetMon Community Edition through 1.2.9 contains a stack-based buffer overflow in the BGP NLRI (Network Layer Reachability Information) decoder. The function decode_bgp_subnet_encoding_ipv4_raw() in src/bgp_protocol.cpp reads prefix_bit_length directly from the BGP packet (line 99) without validating it is <= 32 for IPv4 prefixes. This value is passed to how_much_bytes_we_need_for_storing_certain_subnet_mask() which computes ceil(prefix_bit_length / 8), returning up to 32 bytes for a prefix_bit_length of 255. The result is used as the length argument to memcpy() (line 106), which copies into a 4-byte uint32_t stack variable (prefix_ipv4). This causes a stack buffer overflow of up to 28 bytes, which can be exploited for arbitrary code execution. Additionally, the unvalidated prefix_bit_length is passed to convert_cidr_to_binary_netmask_local_function_copy() (line 111), where a shift of (32 - cidr) with cidr > 32 causes undefined behavior.

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FastNetMon 安全漏洞

FastNetMon是Pavel Odintsov个人开发者的一个基于多个数据包捕获引擎构建的高性能 DDoS 检测器/传感器。 FastNetMon Community Edition 1.2.9及之前版本存在安全漏洞，该漏洞源于BGP NLRI解码器中未验证前缀位长度，可能导致栈缓冲区溢出。

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