libssh OTP-28.5.0.3 Path Traversal Vulnerability Fix Analysis

Vulnerability Overview This vulnerability involves the file within the library, specifically in the function. The issue stems from improper handling of path resolution, which may lead to a path traversal vulnerability. Scope of Impact Affected File: Affected Version: OTP-28.5.0.3 Remediation Plan 1. Code Modification: - Added validation logic for paths within the function to ensure that paths do not exceed the expected directory scope. - Specific modifications include: - Validating and to ensure that paths do not contain illegal characters or exceed the expected scope. - Invoking the function to ensure the correctness of path resolution. 2. Test Cases: - Added multiple test cases in the file to verify the path resolution functionality after the fix. - The test cases include: - - - - POC Code The following is the key code snippet after the fix: ```erlang ssh_sftp_realpath(ReqId, State) -> >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_state = xfer_reply(ReqId, Version, State) }} when binary(State) -> State#state{ xfer_state = xfer_reply(ReqId, Version, State) }; >, State#state{ xfer_s

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libssh OTP-28.5.0.3 Path Traversal Vulnerability Fix Analysis

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