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                             CERT-Renater

                 Note d'Information No. 2021/VULN211
_____________________________________________________________________

DATE                : 13/04/2021

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S): Systems running Apache Solr versions prior to
                                          8.8.2.

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http://mail-archives.apache.org/mod_mbox/www-announce/202104.mbox/%3cCAJRvFdoLKEu1dH8_6XBFtQgMy18PeLa3or8_+OzwnqZZ21qJ6A@mail.gmail.com%3e
http://mail-archives.apache.org/mod_mbox/www-announce/202104.mbox/%3cCAJRvFdpjOFcaSDh5iNK4QbGzk66gg4b3TCvrNrB6-ofXSgFVUg@mail.gmail.com%3e
http://mail-archives.apache.org/mod_mbox/www-announce/202104.mbox/%3cCAJRvFdqj6R1_m1sv-mSRgmcEgRAkwZc=5+29KuDw2QKdTjN6Fg@mail.gmail.com%3e
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CVE-2021-29943: Apache Solr Unprivileged users may be able to perform
unauthorized read/write to collections


Description:

When using ConfigurableInternodeAuthHadoopPlugin for authentication,
Apache Solr versions prior to 8.8.2 would forward/proxy distributed
requests using server credentials instead of original client
credentials. This would result in incorrect authorization resolution
on the receiving hosts.

This issue is being tracked as SOLR-15233

Credit:

Geza Nagy

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CVE-2021-29262: Apache Solr: Misapplied Zookeeper ACLs can result in
leakage of configured authentication and authorization settings


Description:

When starting Apache Solr versions prior to 8.8.2, configured with the
SaslZkACLProvider or VMParamsAllAndReadonlyDigestZkACLProvider and no
existing security.json znode, if the optional read-only user is
configured then Solr would not treat that node as a sensitive path and
would allow it to be readable.

Additionally, with any ZkACLProvider, if the security.json is already
present, Solr will not automatically update the ACLs.

This issue is being tracked as SOLR-15249

Mitigation:

Manually set appropriate ACLs on /security.json znode.

Credit:

Timothy Potter and Mike Drob, Apple Cloud Services

_____________________________________________________________________

CVE-2021-27905: Apache Solr: SSRF vulnerability with the Replication handler


Description:

The ReplicationHandler (normally registered at "/replication" under a
Solr core) has a "masterUrl" (also "leaderUrl" alias) parameter that
is used to designate another ReplicationHandler on another Solr core
to replicate index data into the local core.  To prevent a SSRF
vulnerability, Solr ought to check these parameters against a similar
configuration it uses for the "shards" parameter.  Prior to this bug
getting fixed, it did not.

This problem affects essentially all Solr versions prior to it getting
fixed in 8.8.2.

This issue is being tracked as SOLR-15217

Mitigation:

Ensure that any access to the replication handler is purely internal
to Solr.  Typically, it's only accessed externally for
diagnostic/informational purposes.

Credit:

Reported by Caolinhong(Skay) from QI-ANXIN Cert (QI-ANXIN Technology
Group Inc.)


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