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Bug 103401 contains a suggestion for denylist entries for bindresvport:
The glibc algorithm already blacklists all reserved ports below 600, presumably
to avoid this exact problem. Consider altering the code to blacklist 5 to 8
additional ports in the 600-1023 range that are or may be in common use:
631 (IPP == CUPS)
636 (LDAPS)
749 (Kerberos V kadmin)
873 (rsyncd)
992-995 (SSL-enabled telnet, IMAP, IRC, and POP3)
Some of these ports are missing from the default denylist in libtirpc, which only contains:
623 # ASF, used by IPMI on some cards
631 # cups
636 # ldaps
664 # Secure ASF, used by IPMI on some cards
921 # lwresd
993 # imaps
995 # pops
It may make sense to incorporate the additional suggested ports.
commit 0c106998414d81d5a10b72d6e9763b23379bd254 (HEAD -> master)
Author: Florian Weimer <fweimer>
Date: Wed Apr 7 10:37:14 2021 -0400
blacklist: Add a few more well known ports
(In reply to Steve Dickson from comment #3)
> commit 0c106998414d81d5a10b72d6e9763b23379bd254 (HEAD -> master)
> Author: Florian Weimer <fweimer>
> Date: Wed Apr 7 10:37:14 2021 -0400
>
> blacklist: Add a few more well known ports
For the record, I wouldn't use that kind of terminology today.
Is this commit in a public repository?
(In reply to Florian Weimer from comment #4)
> (In reply to Steve Dickson from comment #3)
> > commit 0c106998414d81d5a10b72d6e9763b23379bd254 (HEAD -> master)
> > Author: Florian Weimer <fweimer>
> > Date: Wed Apr 7 10:37:14 2021 -0400
> >
> > blacklist: Add a few more well known ports
>
> For the record, I wouldn't use that kind of terminology today.
>
> Is this commit in a public repository?
Yes... git://linux-nfs.org/~steved/libtirpc
My apologies if I mis-spoke for you... that was the
terminology I used when I posted the patch.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (libtirpc bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2021:4375