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smb2/read: Parse only 1 byte for data_offset, ignore reserved1

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A user provided a SMB2 pcap with the reserved1 field of a ReadResponse
set to 1 instead of 0. This confused the padding computation due to
including this byte into the offset. Properly split data_offset and
reserved1 into individual byte fields.

Closes #4730
This commit is contained in:
Arne Welzel 2025-08-08 15:42:15 +02:00
parent 13f613eb1d
commit b2a2ad7e10
5 changed files with 26 additions and 2 deletions
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5
src/analyzer/protocol/smb/smb2-com-read.pac
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@ -93,10 +93,11 @@ type SMB2_read_request(header: SMB2_Header) = record {
type SMB2_read_response(header: SMB2_Header) = record {
structure_size : uint16;
data_offset : uint16;
data_offset : uint8;
reserved1 : uint8;
data_len : uint32;
data_remaining : uint32;
reserved : uint32;
reserved2 : uint32;
pad : padding to data_offset - header.head_length;
data : bytestring &length=data_len;
} &let {