file-type affected by infinite loop in ASF parser on malformed input with zero-size sub-header

file-type detects the file type of a file, stream, or data. Prior to 21.3.1, a denial of service vulnerability exists in the ASF (WMV/WMA) file type detection parser. When parsing a crafted input where an ASF sub-header has a size field of zero, the parser enters an infinite loop. The payload value becomes negative (-24), causing tokenizer.ignore(payload) to move the read position backwards, so the same sub-header is read repeatedly forever. Any application that uses file-type to detect the type of untrusted/attacker-controlled input is affected. An attacker can stall the Node.js event loop with a 55-byte payload. Fixed in version 21.3.1.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

不可达退出条件的循环(无限循环)

file type 安全漏洞

file type是Sindre Sorhus个人开发者的一个文件类型检测工具。 file type 21.3.1之前版本存在安全漏洞，该漏洞源于ASF文件类型检测解析器在处理特制输入时可能进入无限循环，可能导致拒绝服务。

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