Downloading 300KiB file over http->named pipe pivot breaks implant and fails

[snieradkiewicz]

Describe the bug
Downloading a 300KiB file through named pipe pivot to http session breakes pivot implant and fails.

To Reproduce
Steps to reproduce the behavior:

1. use 123abc #http session
2. pivots named-pipe --bind testpipe --allow-all
3. generate --named-pipe 123.123.123.123/pipe/testpipe # fix ip address to mach IP of host with 123abc session
4. Run new beacon on third system and get connection
5. use 789def # named-pipe pivot beacon
6. download file.zip #300KiB
7. get error: [!] rpc error: code = Unknown desc = implant timeout

Expected behavior
Implant don't crash and file downloads.

Desktop (please complete the following information):

• OS: [Kali linux]
• Version [6.3.0]
• Sliver Version [1.5.41]

Additional context
I'm working in multiplayer mode.
Downloading files without pivot over named pipes works well.
Network connection is probably not an issue. This is internal lab - everything is setup on VMs on single host.