IPReassembler packing#416
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October 2, 2018 13:57
A malformed IP6Address, i.e. with more than 8 components, will cause the memmove/memset at the end of parsing to fail. This code is supposed to move the post-:: bytes to the end of the address and zero out the bytes in the center. Instead, it moves some of the bytes the wrong way, potentially writing prior to parts[] and then zeroing with a negative size. Instead, make the parser stop when it hits 8 components and let parse figure out that we did not consume the entire String. Thanks: American Fuzzy Lop Change-Id: I2966cb22fb5b44eb9e92dfc6a94e891cf5d02fa7
The check here appears to be intended to make sure that we only connect if both indexes are valid; specifically, idx can be -1. Unfortunately, it checks (*cp)[0] twice. Instead, check (*cp)[1] too. Thanks, American Fuzzy Lop Change-Id: I5cdeb45ac0cef5bbb0a18c6f19b4540df8007bfe
…Packet::data These two uint16_ts may end up placed at arbitrary offsets into a packet. In order to generate proper unaligned read/write instructions, mark the struct as packed. This was exposed by Defensic suite IPv4 Header Fragment-offset, test 45067 and discovered by Waldin Stone. I verified it by asserting proper alignment of ChunkLinks and found that they were not always properly aligned.
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