CVE-2021-22884

A flaw was found in nodejs. A denial of service is possible when the whitelist includes “localhost6”. When “localhost6” is not present in /etc/hosts, it is just an ordinary domain that is resolved via DNS over the network. If the attacker controls the victim's DNS server or can spoof its responses, the DNS rebinding protection can be bypassed by using the “localhost6” domain. As long as the attacker uses the “localhost6” domain, they can still apply the attack described in CVE-2018-7160.

Red Hat Enterprise Linux ships with localhost and localhost6 defined in /etc/hosts, and thus in general, would not be affected by this flaw, with some specific exceptions, such as :

• /etc/hosts is disabled or has its default content (including localhost6) removed
• the inspector is accessed using SSH tunneling from a remote computer that does not have localhost6 statically defined

Red Hat Quay from version 3.4 consumes the nodejs from RHEL, so security tracking is provided by the container health index on the customer portal [1]. Additionally there is no impact from this issue on Quay 3.3 and 3.2 because they don't use the debug option (--inspect) and nodejs is only used at build time [2]. [1] https://catalog.redhat.com/software/containers/quay/quay-rhel8/600e03aadd19c7786c43ae49?container-tabs=security [2] https://issues.redhat.com/browse/PROJQUAY-1409

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Ensure that 'localhost6' is part of /etc/hosts. e.g.:

$ grep localhost6 /etc/hosts
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6