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fd_set -- bitmap index overflow in multiple applications


3APA3A reports:

If programmer fails to check socket number before using select() or fd_set macros, it's possible to overwrite memory behind fd_set structure. Very few select() based application actually check FD_SETSIZE value. [...]

Depending on vulnerable application it's possible to overwrite portions of memory. Impact is close to off-by-one overflows, code execution doesn't seems exploitable.



portaudit: fd_set -- bitmap index overflow in multiple applications

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Oliver Eikemeier <>