78 lines
5.1 KiB
JSON
78 lines
5.1 KiB
JSON
[
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{
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"file_path": "dprintf_extract.c",
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"vul_info": [
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"Yes, there is a format string vulnerability in the `echo_handler` function. The vulnerability arises from the use of `dprintf(sock, buffer)` where `buffer` is directly passed as the format string. Since `buffer` contains data received from the network via the `recv` function, an attacker can send a specially crafted string to exploit this vulnerability.\n\nFormat string vulnerabilities occur when user-controlled input is used as the format string in functions like `printf`, `dprintf`, `sprintf`, etc., without proper validation or sanitization. This can lead to various security issues, including reading from or writing to arbitrary memory locations, depending on the format specifiers used by the attacker.\n\nIn this case, an attacker could send a format string containing `%x`, `%s`, or other format specifiers to potentially read memory contents or cause other unintended behavior. To mitigate this vulnerability, user input should not be used directly as a format string. Instead, a fixed format string should be used, and user input should be passed as an argument, like `dprintf(sock, \"%s\", buffer)`."
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]
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": [
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"Yes, the program contains a format string vulnerability in the `echo_handler` function. The vulnerability arises from the use of `dprintf(sock, buffer)` where `buffer` is directly used as the format string. Since `buffer` is populated with data received from the network via `recv(sock, buffer, 0x100uLL, 0)`, an attacker can send a specially crafted string to exploit this vulnerability.\n\nIf the attacker sends format specifiers (like `%x`, `%s`, etc.) in the data, they can potentially read memory contents or cause other unintended behavior, such as writing to memory if `%n` is used. This vulnerability is particularly dangerous because it can lead to arbitrary code execution, especially if combined with other vulnerabilities or if the attacker can control the stack or memory layout.\n\nTo mitigate this vulnerability, the `dprintf` call should be modified to specify a format string explicitly, such as `dprintf(sock, \"%s\", buffer)`, to prevent the user-controlled data from being interpreted as a format string."
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]
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": [
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"Yes, the program contains a format string vulnerability in the `echo_handler` function. The vulnerability arises from the use of `dprintf(sock, buffer)` where `buffer` is directly used as the format string. Since `buffer` is populated with data received from the network via the `recv` function, an attacker can send a specially crafted string to exploit this vulnerability.\n\nIf an attacker sends format specifiers (like `%s`, `%x`, `%n`, etc.) in the data received into `buffer`, these will be interpreted by `dprintf` as format specifiers rather than as plain text. This can lead to various issues, including reading unintended memory locations or writing to memory if `%n` is used, potentially leading to arbitrary code execution.\n\nTo mitigate this vulnerability, the format string should be specified explicitly, for example by using `dprintf(sock, \"%s\", buffer)`, which treats `buffer` as a string to be printed rather than a format string."
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]
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": [
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"Yes, the program contains a dprintf format string vulnerability. The vulnerability is present in the `echo_handler` function, specifically in the line:\n\n```c\ndprintf(sock, buffer)\n```\n\nHere, `buffer` is directly passed as the format string to `dprintf` without any format specifiers. Since `buffer` is filled with data received from the network via the `recv` function, an attacker can send a specially crafted string containing format specifiers (like `%x`, `%s`, `%n`, etc.) to exploit this vulnerability.\n\nThis can lead to various security issues, such as reading arbitrary memory locations, crashing the program, or even executing arbitrary code, depending on the context and the specific format specifiers used by the attacker."
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]
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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},
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{
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"file_path": "dprintf_extract.c",
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"vul_info": []
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}
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] |