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SamFok's avatar
SamFok
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Apr 20, 2020

Fail to access DVWA which is behind F5 LTM

hi Team,   Step 1. Tried to setup the DVWA docker accordingly to below link: https://github.com/ethicalhack3r/DVWA docker run --rm -it -p 80:80 vulnerables/web-dvwa   When access the DVWA ...
application delivery
BIG-IP
LTM
SamFok's avatar
SamFok
Icon for Altostratus rankAltostratus
Apr 21, 2020

Thanks Martin,

 

It may due to the F5 LTM is deployed as Single Nic in the GCP, where:

 

10.1.1.14: LTM IP (single nic)

10.1.1.15: DVWA IP

XX.XX.XX.XX: masked public ip from my computer

 

Capture the said tcp dump as attached, and in the last few entries,

 

------------------------------------------------

10:25:00.492238 IP 10.1.1.14.43358 > 10.1.1.15.80: Flags [F.], seq 10, ack 2, win 222, options [nop,nop,TS val 1013071 ecr 2516564255], length 0 in slot1/tmm0 lis= flowtype=66 flowid=5

600019C9C40 peerid=5600019C9D40 conflags=24000E26 inslot=63 inport=23 haunit=0 priority=0 peerremote=00000000:00000000:0000FFFF:0A01010F peerlocal=00000000:00000000:0000FFFF:0A01010E r

emoteport=80 localport=43358 proto=6 vlan=4094

 

10:25:00.492248 IP 10.1.1.14.43358 > 10.1.1.15.80: Flags [F.], seq 1908046924, ack 2, win 222, options [nop,nop,TS val 2592968267 ecr 2516564255], length 0 out slot1/tmm0 lis= flowtype

=130 flowid=5600019C9D40 peerid=5600019C9C40 conflags=4000E26 inslot=63 inport=23 haunit=0 priority=0 peerremote=00000000:00000000:0000FFFF:0A01010E peerlocal=00000000:00000000:0000FFF

F:0A01010F remoteport=43358 localport=80 proto=6 vlan=4094

 

10:25:00.492398 IP 10.1.1.15.80 > 10.1.1.14.43358: Flags [.], ack 1908046925, win 1018, options [nop,nop,TS val 2516564255 ecr 2592968267], length 0 in slot1/tmm0 lis= flowtype=130 flo

wid=5600019C9D40 peerid=5600019C9C40 conflags=4000E26 inslot=63 inport=23 haunit=0 priority=0 peerremote=00000000:00000000:0000FFFF:0A01010E peerlocal=00000000:00000000:0000FFFF:0A0101

0F remoteport=43358 localport=80 proto=6 vlan=4094

 

10:25:00.492407 IP 10.1.1.15.80 > 10.1.1.14.43358: Flags [.], ack 11, win 1018, options [nop,nop,TS val 2516564255 ecr 1013071], length 0 out slot1/tmm0 lis= flowtype=66 flowid=5600019

C9C40 peerid=5600019C9D40 conflags=24000E26 inslot=63 inport=23 haunit=0 priority=0 peerremote=00000000:00000000:0000FFFF:0A01010F peerlocal=00000000:00000000:0000FFFF:0A01010E remotep

ort=80 localport=43358 proto=6 vlan=4094

------------------------------------------------

 

it does see back and forth communication between the LTM and DVWA servers.

Any comment? thx.

 

Br,

Sam Fok