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smb1: Prevent accessing uninitialized referenced_tree

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The added pcap was created from an OSS Fuzz test case and is borderline
valid SMB traffic, but it triggered a scripting error.

Closes #2726
This commit is contained in:
Arne Welzel 2023-01-27 19:22:09 +01:00
parent 589e042e26
commit 8be8c22b3e
5 changed files with 31 additions and 0 deletions
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1
scripts/base/frameworks/notice/weird.zeek
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@ -206,6 +206,7 @@ export {
["SMB_parsing_error"] = ACTION_LOG,
["no_smb_session_using_parsesambamsg"] = ACTION_LOG,
["smb_andx_command_failed_to_parse"] = ACTION_LOG,
["smb_tree_connect_andx_response_without_tree"] = ACTION_LOG_PER_CONN,
["transaction_subcmd_missing"] = ACTION_LOG,
["successful_RPC_reply_to_invalid_request"] = ACTION_NOTICE_PER_ORIG,
["SYN_after_close"] = ACTION_LOG,

9
scripts/base/protocols/smb/smb1-main.zeek
View file

@ -107,6 +107,15 @@ event smb1_tree_connect_andx_request(c: connection, hdr: SMB1::Header, path: str
event smb1_tree_connect_andx_response(c: connection, hdr: SMB1::Header, service: string, native_file_system: string) &priority=5
{
# If the current_cmd does not have a referenced tree, then likely we
# missed the SMB_COM_TREE_CONNECT_ANDX. Report a weird and stop.
if ( ! c$smb_state$current_cmd?$referenced_tree )
{
local addl = fmt("current_cmd=%s", c$smb_state$current_cmd$command);
Reporter::conn_weird("smb_tree_connect_andx_response_without_tree", c, addl);
return;
}
c$smb_state$current_cmd$referenced_tree$service = service;
if ( service == "IPC" )
c$smb_state$current_cmd$referenced_tree$share_type = "PIPE";