[Bug network/31413] New: getaddrinfo: DNS resolution fails if a CNAME target begins with a hyphen

[Bug network/31413] New: getaddrinfo: DNS resolution fails if a CNAME target begins with a hyphen

[manuel at mozilla dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31413

            Bug ID: 31413
           Summary: getaddrinfo: DNS resolution fails if a CNAME target
                    begins with a hyphen
           Product: glibc
           Version: unspecified
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: manuel at mozilla dot com
  Target Milestone: ---

Clone of Firefox Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1870497

> User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0
> 
> Steps to reproduce:
> 
> Set up the following DNS records:
> 
> www1.test A 192.0.2.1
> _www2.test A 192.0.2.1
> www3._www3.test A 192.0.2.1
> www_4.test A 192.0.2.1
> -www5.test A 192.0.2.1
> www6.-www6.test A 192.0.2.1
> 
> cname1.test CNAME www1.test
> cname2.test CNAME _www2.test
> cname3.test CNAME www3._www3.test
> cname4.test CNAME www_4.test
> cname5.test CNAME -www5.test
> cname6.test CNAME www6.-www6.test
> 
> Open all of the "cname1" to "cname6" hostnames as URLs in Firefox.
> 
> Actual results:
> 
> The "cname5" hostname returns "Server Not Found".
> 
> The other names can be resolved and Firefox will connect to them.
> 
> Expected results:
> 
> All of "cname1" to "cname6" can be resolved and Firefox will connect to them.
> 
> The hostnames used in CNAME targets (or chains of CNAME targets) should not be subject to the same validation as the hostname in the URL.

In Firefox on Linux we use glibc getaddrinfo to resolve hostnames. I think
fixing this in glibc would be best.

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[Bug network/31413] getaddrinfo: DNS resolution fails if a CNAME target begins with a hyphen

[manuel at mozilla dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31413

Manuel Bucher <manuel at mozilla dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://bugzilla.mozilla.or
                   |                            |g/show_bug.cgi?id=1870497

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[Bug network/31413] getaddrinfo: DNS resolution fails if a CNAME target begins with a hyphen

[fw at deneb dot enyo.de]

https://sourceware.org/bugzilla/show_bug.cgi?id=31413

Florian Weimer <fw at deneb dot enyo.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fw at deneb dot enyo.de
           See Also|                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=12154

--- Comment #1 from Florian Weimer <fw at deneb dot enyo.de> ---
On which glibc versions do you observe this?

This should have been fixed under bug 12154.

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[Bug network/31413] getaddrinfo: DNS resolution fails if a CNAME target begins with a hyphen

[fw at deneb dot enyo.de]

https://sourceware.org/bugzilla/show_bug.cgi?id=31413

Florian Weimer <fw at deneb dot enyo.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
           See Also|https://sourceware.org/bugz |
                   |illa/show_bug.cgi?id=12154  |
              Flags|                            |security-
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #2 from Florian Weimer <fw at deneb dot enyo.de> ---
Per https://bugzilla.mozilla.org/show_bug.cgi?id=1870497#c7 this is already
fixed in current glibc—it's a duplicate of bug 12154.

*** This bug has been marked as a duplicate of bug 12154 ***

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