How to Protect Your Network Against TP-Link Router Critical Vulnerabilities

---
title: Potential Router Command Injection via Web Interface
id: a1b2c3d4-e5f6-4789-a012-34567890abcdef
status: experimental
description: Detects potential command injection attempts against router web management interfaces based on suspicious HTTP request patterns
references:
  - https://nvd.nist.gov/
  - https://www.securityweek.com/tp-link-patches-high-severity-router-vulnerabilities/
author: Security Arsenal
date: 2024/01/15
tags:
  - attack.initial_access
  - attack.t1190
  - attack.execution
  - attack.t1059.001
logsource:
  category: proxy
  product: squid
detection:
  selection:
    c-uri|contains:
      - '/cgi-bin/'
      - '/admin/'
    c-uri|contains|any:
      - ';'
      - '|'
      - '`'
      - '$('
      - '&&'
      - '||'
      - 'nc '
      - 'wget '
      - 'curl '
  filter:
    c-uri|contains:
      - ';jsessionid'
      - ';phpsessid'
condition: selection and not filter
falsepositives:
  - Legitimate administrative scripts with unusual parameters
level: high
---
title: Suspicious Router Authentication Bypass Attempts
id: b2c3d4e5-f6a7-4890-b123-45678901cdef
status: experimental
description: Detects suspicious authentication bypass attempts against router management interfaces
references:
  - https://attack.mitre.org/techniques/T1078/
  - https://www.securityweek.com/tp-link-patches-high-severity-router-vulnerabilities/
author: Security Arsenal
date: 2024/01/15
tags:
  - attack.initial_access
  - attack.t1078
  - attack.credential_access
  - attack.t1552.001
logsource:
  category: network_connection
detection:
  selection:
    DestinationPort:
      - 80
      - 443
      - 8080
      - 8443
    DestinationIp|cidr:
      - '192.168.0.0/16'
      - '10.0.0.0/8'
      - '172.16.0.0/12'
  timing:
    SourceIp|startswith:
      - '192.168.'
      - '10.'
      - '172.'
  condition: selection and timing
falsepositives:
  - Normal internal network management traffic
level: medium
---
title: Abnormal Router Configuration File Access
id: c3d4e5f6-a7b8-4901-c234-56789012def0
status: experimental
description: Detects attempts to access or download router configuration backup files which may indicate exploitation of decryption vulnerabilities
references:
  - https://attack.mitre.org/techniques/T1005/
  - https://www.securityweek.com/tp-link-patches-high-severity-router-vulnerabilities/
author: Security Arsenal
date: 2024/01/15
tags:
  - attack.collection
  - attack.t1005
  - attack.exfiltration
  - attack.t1041
logsource:
  category: file_event
  product: windows
detection:
  selection:
    TargetFilename|contains:
      - 'config'
      - 'backup'
      - 'settings'
    TargetFilename|endswith:
      - '.cfg'
      - '.conf'
      - '.bin'
      - '.xml'
      - '.dat'
  condition: selection
falsepositives:
  - Legitimate configuration backups by administrators
level: medium

// Detect potential command injection attempts against router web interfaces
Syslog
| where Facility in ("nginx", "apache", "httpd", "squid")
| extend RequestUri = extract(@"GET\s+(.*?)\s+", 1, SyslogMessage)
| extend UserAgent = extract(@"User-Agent:\s+(.*?)\s", 1, SyslogMessage)
| where RequestUri has_any("cgi-bin", "admin", "webui", "manage") 
and (RequestUri has_any(";", "|", "`", "$(", "&&", "||") 
or RequestUri has_any("nc ", "wget ", "curl ", "bash ", "sh "))
| project TimeGenerated, ComputerIP, RequestUri, UserAgent, SyslogMessage
| order by TimeGenerated desc

// Identify TP-Link router devices on the network
CommonSecurityLog
| where DeviceVendor =~ "TP-Link"
| summarize count() by DeviceProduct, Version, DeviceAddress
| extend IsVulnerable = iff(Version in ("1.0", "1.1", "1.2", "2.0", "2.1", "2.2"), "Yes", "Check Advisory")

// Detect multiple failed authentication attempts to router management interfaces
SigninLogs
| where AppDisplayName contains_any("router", "firewall", "gateway") or ResourceDisplayName contains_any("router", "firewall", "gateway")
| where ResultDescription != "Success"
| summarize FailedAttempts = count() by UserPrincipalName, IPAddress, AppDisplayName, bin(TimeGenerated, 5m)
| where FailedAttempts > 5
| project TimeGenerated, UserPrincipalName, IPAddress, AppDisplayName, FailedAttempts

-- Hunt for TP-Link router devices on the network
SELECT IP, Mac, Vendor, Interface
FROM arp_table()
WHERE Vendor =~ 'TP-Link' OR Vendor =~ 'TP-LINK TECHNOLOGIES'

-- Search for router configuration files on endpoints
SELECT FullPath, Size, Mtime, Atime
FROM glob(globs='C:/Users/*/*.cfg', 'C:/Users/*/*.conf', 'C:/Users/*/*.bin')
WHERE FullPath =~ '(config|backup|settings|router)'

-- Identify network connections to default router management ports
SELECT Timestamp, SourceAddress, SourcePort, DestinationAddress, DestinationPort, ProcessName, PID
FROM netstat()
WHERE DestinationPort IN (80, 443, 8080, 8443, 1883, 8883, 1900)
AND DestinationAddress NOT IN ('127.0.0.1', '::1')
ORDER BY Timestamp DESC

# Check for vulnerable TP-Link devices in the network
function Find-TPLinkDevices {
    param(
        [string]$Subnet = "192.168.1"
    )
    
    $results = @()
    1..254 | ForEach-Object {
        $ip = "$Subnet.$_"
        $ping = Test-Connection -ComputerName $ip -Count 1 -Quiet -ErrorAction SilentlyContinue
        if ($ping) {
            try {
                $mac = (Get-NetNeighbor -IPAddress $ip -ErrorAction Stop).LinkLayerAddress
                if ($mac) {
                    $vendor = $mac.Substring(0, 6)
                    $results += [PSCustomObject]@{
                        IPAddress = $ip
                        MacAddress = $mac
                        IsTPLink = ($mac -match '^(?:50:C7:BF|A0:F3:C1|EC:41:18|D4:6E:0E)')
                        Status = "Online"
                    }
                }
            } catch {
                Write-Verbose "Could not get MAC for $ip"
            }
        }
    }
    $results | Where-Object { $_.IsTPLink }
}

# Generate vulnerability report for TP-Link devices
$vulnerableDevices = Find-TPLinkDevices -Subnet "192.168.1"
if ($vulnerableDevices.Count -gt 0) {
    Write-Host "Found $($vulnerableDevices.Count) TP-Link device(s) on the network:" -ForegroundColor Yellow
    $vulnerableDevices | Format-Table -AutoSize
    Write-Host "ACTION REQUIRED: Verify firmware versions and apply patches immediately." -ForegroundColor Red
} else {
    Write-Host "No TP-Link devices detected on the local subnet." -ForegroundColor Green
}