0 byte write heap buffer overflow in start_decoder in stb_vorbis

stb_vorbis is a single file MIT licensed library for processing ogg vorbis files. A crafted file may trigger out of bounds write in `f->vendor[len] = (char)'\0';`. The root cause is that if the len read in `start_decoder` is `-1` and `len + 1` becomes 0 when passed to `setup_malloc`. The `setup_malloc` behaves differently when `f->alloc.alloc_buffer` is pre-allocated. Instead of returning `NULL` as in `malloc` case it shifts the pre-allocated buffer by zero and returns the currently available memory block. This issue may lead to code execution.

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

跨界内存写

stb_vorbis 缓冲区错误漏洞

stb_vorbis是一款开源的用于解码ogg vorbis文件的音频解码器。 stb_vorbis 存在安全漏洞，该漏洞源于精心设计的文件可能会触发“f->vendor[len] = (char) ;”中的越界写入。

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