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    TP-Link Easy Smart Switch security question

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    • JKnottJ
      JKnott
      last edited by

      That fix doesn't seem to apply to the TL-SG105E switch.

      PfSense running on Qotom mini PC
      i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
      UniFi AC-Lite access point

      I haven't lost my mind. It's around here...somewhere...

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      • T
        tpham3783
        last edited by

        @JKnott:

        That fix doesn't seem to apply to the TL-SG105E switch.

        Were you able to see the port assignment changed in step# 5?

        by the way, i saw vlan isolation w/ the work-around solution.  The only thing I saw strange was that the switch's IP address is a member of all vlans.  If I were to change my PC's IP address to the same subnet of the switch, I could communicate to it on non-native vlan, which is kinda weird.

        However, the switch is no longer behaving like a dumb switch because ports are removed from vlan1.

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        • johnpozJ
          johnpoz LAYER 8 Global Moderator
          last edited by

          I will give this a try on 105E v2 tonight when I get home..  Great info.. Thanks.

          An intelligent man is sometimes forced to be drunk to spend time with his fools
          If you get confused: Listen to the Music Play
          Please don't Chat/PM me for help, unless mod related
          SG-4860 24.11 | Lab VMs 2.7.2, 24.11

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          • lexxaiL
            lexxai
            last edited by

            Some analyze information about apply this method to TL-SG1016DE (HW:2)

            vlan:777,port: 5tag, name: TESTVVV
            777 = 0x0309 (0x09 0x03)
            5 =  0x10  (0001 0000) 5 bit.

            vlan:777,port: 5untag, name: TESTVVV
            777 = 0x0309 (0x09 0x03)
            5 =  0x10  (0001 0000) 5 bit.

            source: http://lexxai.pp.ua

            –
            We have what we have. Everything that happens - for the better.

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            • thuetyT
              thuety
              last edited by

              @tpham3783:

              Here is how you can hack ( un-member ports on vlan1).  I have already tested on the SG108PE (hw version 3) switch and it worked.

              Worked on my TL-SG108E 2.0, thanks!
              Why didn't I think of this…  ::)

              sg108e_vlan1_hack.PNG
              sg108e_vlan1_hack.PNG_thumb

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              • JKnottJ
                JKnott
                last edited by

                Were you able to see the port assignment changed in step# 5?

                No, there was very little recognizable text in the hex editor.  I did not see the word "Default", as shown in lexxai's post.

                The only thing I saw strange was that the switch's IP address is a member of all vlans.  If I were to change my PC's IP address to the same subnet of the switch, I could communicate to it on non-native vlan, which is kinda weird.

                On managed switches I've worked on, there was a specific management interface, which was assigned an IP address.  I've also set up networks where the management interface was on a separate VLAN.

                PfSense running on Qotom mini PC
                i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
                UniFi AC-Lite access point

                I haven't lost my mind. It's around here...somewhere...

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                • thuetyT
                  thuety
                  last edited by

                  @JKnott:

                  The only thing I saw strange was that the switch's IP address is a member of all vlans.  If I were to change my PC's IP address to the same subnet of the switch, I could communicate to it on non-native vlan, which is kinda weird.

                  On managed switches I've worked on, there was a specific management interface, which was assigned an IP address.  I've also set up networks where the management interface was on a separate VLAN.

                  Even after setting the VLAN 1 membership to port 8 only… I can still connect a client to any switch port, set the IP to the same subnet and then access the switch web login.
                  So the VLAN 1 has no relevance for web admin access... I guess we can kill all VLAN 1 membership with the HEX hack..!?

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                  • stephenw10S
                    stephenw10 Netgate Administrator
                    last edited by

                    Hmm, well this is interesting. Implies it's a gui limitation only.

                    The exact string Default_VLAN does not appear in the config from a TL-SG1016DE v1. Not quite the same as the v2 either. Some experimentation needed….

                    Steve

                    ![Config(1).cfg - GHex_311.png](/public/imported_attachments/1/Config(1).cfg - GHex_311.png)
                    ![Config(1).cfg - GHex_311.png_thumb](/public/imported_attachments/1/Config(1).cfg - GHex_311.png_thumb)

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                    • T
                      tpham3783
                      last edited by

                      @thuety:

                      Even after setting the VLAN 1 membership to port 8 only… I can still connect a client to any switch port, set the IP to the same subnet and then access the switch web login.
                      So the VLAN 1 has no relevance for web admin access... I guess we can kill all VLAN 1 membership with the HEX hack..!?

                      I saw that too.  It looks like the switch (management IP) is a member of all vlans, and that the gui an be accessed from any access-ports.  However, the gui can not be accessed on a trunk port (tagged port), unless you configure another vlan w/ the trunk port configured as untagged port.  Attached is a picture of my improved config where I ended up removing all ports from vlan1.

                      Although I can access the swith's management interface on any access-ports (untagged ports), I can not access PCs that belong on another VLAN.  Would you please confirm that's what you're seeing too?  thanks

                      config.png
                      config.png_thumb

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                      • T
                        tpham3783
                        last edited by

                        @stephenw10:

                        Hmm, well this is interesting. Implies it's a gui limitation only.

                        The exact string Default_VLAN does not appear in the config from a TL-SG1016DE v1. Not quite the same as the v2 either. Some experimentation needed….

                        Steve

                        yeah, keep on working at it.  I'd create one vlan (ie. vlan 2) with all ports as untagged member, save the config.  Then generate a second config with the last port removed from the vlan.  Diff the two files ie:

                        hexdump -C config.cfg.original > /tmp/config.cfg.original.hex # vlan2 w/ all ports
                          hexdump -C config.cfg > /tmp/config.cfg.hex  # vlan2 w/ all ports but the last port

                        diff -urN /tmp/config.cfg.original.hex /tmp/config.cfg.hex

                        Then you would have a good idea where the vlan config token is set.

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                        • N
                          n3by
                          last edited by

                          Sg108E: at least in GUI I deleted default vlan 1.

                          ![2017-11-12 16.50.09.jpg](/public/imported_attachments/1/2017-11-12 16.50.09.jpg)
                          ![2017-11-12 16.50.09.jpg_thumb](/public/imported_attachments/1/2017-11-12 16.50.09.jpg_thumb)
                          tplink108.jpg
                          tplink108.jpg_thumb

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                          • stephenw10S
                            stephenw10 Netgate Administrator
                            last edited by

                            Seems to have some file validation/checksum that prevents uploading a modified file…. no one else seeing that? I'd be surprised if they actually removed that from the v2.

                            Steve

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                            • N
                              n3by
                              last edited by

                              Tested and NO checksum for:
                              Firmware Version 1.0.2 Build 20160526 Rel.34615
                              Hardware Version TL-SG108E 2.0

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                              • stephenw10S
                                stephenw10 Netgate Administrator
                                last edited by

                                Hmm, using:

                                Firmware Version 1.0.1 Build 20131023 Rel.33236
                                Hardware Version TL-SG1016DE 1.0

                                Refuses any edited config

                                Invalid config file! Please double check!

                                Yet lexxai seems to be good on his 1016DEv2….

                                Steve

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                                • jahonixJ
                                  jahonix
                                  last edited by

                                  Check if there's a checksum or such yourself?

                                  a) save config_1
                                  b) change something small like hostname one character from lower to upper case. Don't change length.
                                  c) save config_2
                                  d) diff config_1 and config_2

                                  e) report result.

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                                  • stephenw10S
                                    stephenw10 Netgate Administrator
                                    last edited by

                                    Speculating….

                                    The things that change other than the config change are the password seems to be re-hashed and stored twice. And at the begging of the file there is a 16bit value that changes. I'd bet that's a 16bit checksum but of what exactly I'm not sure. Or what algorithm... Not found a match so far.

                                    Steve

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                                    • JKnottJ
                                      JKnott
                                      last edited by

                                      I can not access PCs that belong on another VLAN.  Would you please confirm that's what you're seeing too?

                                      That's how VLANs are supposed to work, as though each VLAN is on a separate switch.  It's the accessing the management from any VLAN that's messed up.  It should be possible to have the management on it's own VLAN, unreachable from any other.

                                      PfSense running on Qotom mini PC
                                      i5 CPU, 4 GB memory, 32 GB SSD & 4 Intel Gb Ethernet ports.
                                      UniFi AC-Lite access point

                                      I haven't lost my mind. It's around here...somewhere...

                                      1 Reply Last reply Reply Quote 0
                                      • T
                                        tpham3783
                                        last edited by

                                        @ecfx:

                                        Sg108E: at least in GUI I deleted default vlan 1.

                                        Good find!

                                        I've always thought they implemented a front-end logic (webpage) for first vlan to be non-editable; hence you must have the first vlan as a place holder!

                                        Thanks!

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                                        • thuetyT
                                          thuety
                                          last edited by

                                          @ecfx:

                                          Sg108E: at least in GUI I deleted default vlan 1.

                                          Thanks, didn't have the courage to try this ;)

                                          I'm guessing the hex 01 is VLAN 1.

                                          vlan1.PNG
                                          vlan1.PNG_thumb

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                                          • N
                                            n3by
                                            last edited by

                                            yes, and this changes seem to persist if you add-delete-change other vlans.

                                            If I could figure how to set 2 "true" - trunk ports will be great.

                                            p.s.
                                            After that I made yesterday other try that soft bricked the switch but can be fix easy with hard button reset.

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