Thank you Mattew,
  yes I am using solrcloud and what I see is that I have this name in
clusterstate.json

 "ldap://log4shell-generic-0QCXG8pYHe3RzoBwsUhT${::-ten.w.nessus.org/nessus}":{
    "router":{"name":"implicit"},
    "shards":{"shard1":{
        "range":null,
        "state":"active",
        "parent":null,
        "replicas":{"core_node1":{
            "state":"down",
            
"core":"ldap://log4shell-generic-0QCXG8pYHe3RzoBwsUhT${::-ten.w.nessus.org/nessus}";,
            "node_name":"solrhostname:solrport_solr",
            "base_url":"http://solrhostname:solrport/solr"}}}}}}


and I don't see anything in /collections and /configs.


But however, I cannot delete it even if I see it in the LIST collection.

I think the problem is in the special characters contained in the name
/ and maybe ${}:

If I tried to issue a delete collection I have

Invalid path string
"/collections/ldap://log4shell-generic-Lme4AEk3XG3WHYjMaBl8${lower:
ten.w.nessus.org/nessus}" caused by empty node name specified @19
How I could delete it ?

How to restrict IP at jetty level in solrcloud (2 nodes) ?
Must I restrict access only to the IPs of the two solr nodes and  and
zookeeper ?

Best Regards
Isabella

Il giorno mer 9 mar 2022 alle ore 16:06 matthew sporleder <
[email protected]> ha scritto:

> I think these names get written to a core.properties file or a
> directory gets created with the offending name (unless you are using
> solrcloud), right?  Check for evidence under the solr home.
>
> The most straightforward defense here is to do IP-based restriction on
> the jetty-level to only allow admin calls from localhost + (maybe)
> other solr servers.
>
> Different versions of solr use different versions of jetty (5.x is
> still war-file/tomcat era sometimes as well) so find the correct
> versions and secure from there.
>
>
> On Wed, Mar 9, 2022 at 9:40 AM Isabella Trevisan
> <[email protected]> wrote:
> >
> > Hi ,
> > I have the same error but with the restart of solr it does not disappear.
> > My solr version is 5.2.1.
> > what can i do to fix the problem?
> >
> > Thank you
> > Regards
> > Isabella
> >
> > Il giorno mer 9 mar 2022 alle ore 00:20 Shawn Heisey <
> [email protected]>
> > ha scritto:
> >
> > > On 3/8/22 14:09, mtn search wrote:
> > > > Our company recently started running vulnerability tests against our
> > > Solr 6
> > > > servers by sending api calls to create cores with the core names
> being
> > > > a nefarious string.  This string is actually an invalid core name
> and so
> > > > the core is not actually created (which is good).  However, it adds
> the
> > > > core init error to the SolrCore Initialization Failures list which
> is at
> > > > the top of every Solr Admin UI page.  Overtime this list gets
> large...
> > > >
> > > > Restarting the Solr instance will clear these init errors from the
> list.
> > > > However, I am wondering if there is another way to clear these
> errors.
> > >
> > > I do not know of a way right now.  Seems like there ought to be a way
> to
> > > clear that list, even if the overall low-level container isn't
> > > restarted.  Life and work are conspiring against me and I won't have
> > > time to look deeper until a lot later this evening (US Mountain
> > > timezone).  I don't think upgrading Solr would help, but version 6 is
> > > quite old now.  You should start planning and testing for a major
> > > upgrade to 8.x.
> > >
> > > Thanks,
> > > Shawn
> > >
> > >
>

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