The SCTP implementation used by FreeBSD ("reference implementation") is vulnerable to a remote NULL pointer dereference in kernel due to a logic bug. When parsing ASCONF chunks, an attempt is made to find an association by address. if the address found is INADDR_ANY, sctp_findassoc_by_vtag() is called and an attempt is made to find an association by vtag. Before searching for the vtag in a hash table, a pointer is set to NULL, with the intention of redefining it after finding the association. However, if the specified vtag is not found, the function returns and the ptr is never reinitialized, causing a kernel panic when the NULL pointer is later dereferenced by the SCTP_INP_DECR_REF macro when flow returns to sctp_process_control(). This is a proof of concept denial of service exploit.
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