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Bug 2115377 - Incorrect parsing of IPv6 IPs in ssh clients
Summary: Incorrect parsing of IPv6 IPs in ssh clients
Keywords:
Status: CLOSED WORKSFORME
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: openssh
Version: 8.5
Hardware: x86_64
OS: Linux
low
low
Target Milestone: rc
: ---
Assignee: Dmitry Belyavskiy
QA Contact: BaseOS QE Security Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2022-08-04 14:41 UTC by Shreyas Mahangade
Modified: 2023-06-14 07:16 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-06-14 07:16:32 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker CRYPTO-8062 0 None None None 2022-08-08 14:59:46 UTC
Red Hat Issue Tracker RHELPLAN-130313 0 None None None 2022-08-04 14:48:02 UTC

Description Shreyas Mahangade 2022-08-04 14:41:29 UTC 
Description of problem:
When using IPv6 for ssh connection it treats it as hostname.

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Try to connect ssh with IPv6 with multiple use cases
2. 
3.

Actual results:
Note: IPs used are local IPs on lab machine

# sftp test@[fe80::f816:3eff:febd:d89e]
ssh: Could not resolve hostname [fe80::f816:3eff:febd:d89e]: Name or service not known
Connection closed.  
Connection closed

# ssh test@[fe80::f816:3eff:febd:d89e]
ssh: Could not resolve hostname [fe80::f816:3eff:febd:d89e]: Name or service not known

# ssh [fe80::f816:3eff:febd:d89e]
ssh: Could not resolve hostname [fe80::f816:3eff:febd:d89e]: Name or service not known

# sftp test@[fe80::f816:3eff:febd:d89e]
ssh: Could not resolve hostname [fe80::f816:3eff:febd:d89e]: Name or service not known
Connection closed.  
Connection closed


# sftp [fe80::f816:3eff:febd:d89e]
ssh: connect to host fe80::f816:3eff:febd:d89e port 22: Invalid argument
Connection closed.  
Connection closed

Loopback IP was parsed correctly

# sftp [::1]
ECDSA key fingerprint is SHA256:uMU1AbOclwdniyeyJBbzXjebd3qdU4yw2A2wBJqtv4g.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '::1' (ECDSA) to the list of known hosts.


Expected results:
Treat IPv6 block with IP and not hostname


Additional info:
This behavior changes for different IPs here. For above IP it is showing
Comment 3 Shreyas Mahangade 2022-08-12 13:24:03 UTC 
It looks like issue might be related to this upstream bug:

   https://bugzilla.mindrot.org/show_bug.cgi?id=1602
Comment 9 Dmitry Belyavskiy 2023-02-07 12:19:00 UTC 
Should be partially fixed for 8.x with https://bugzilla.redhat.com/show_bug.cgi?id=2162733
Comment 10 Dmitry Belyavskiy 2023-03-15 11:28:52 UTC 
Is this bug still relevant, after https://bugzilla.redhat.com/show_bug.cgi?id=2162733 is shipped?
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