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CVE-2021-22884

CVE-2021-22884

EPSS 32.4%CWE-350
In short

Node.js improperly trusts "localhost6" as a safe local address, allowing attackers who control DNS to trick the application into connecting to remote servers. This bypasses protections meant to prevent attacks on local services.

Technical detail

DNS rebinding vulnerability in Node.js whitelist validation: "localhost6" is whitelisted but resolves via DNS when absent from /etc/hosts, enabling network-based rebinding attacks. An attacker controlling the victim's DNS can redirect "localhost6" to arbitrary IP addresses, bypassing CVE-2018-7160 mitigations and accessing restricted local resources.

Summary generated and translated by AI from the official description.
Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to DNS rebinding attacks as the whitelist includes “localhost6”. When “localhost6” is not present in /etc/hosts, it is just an ordinary domain that is resolved via DNS, i.e., over 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.
Affected products
NodeJS · Node

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References
https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdfhttps://hackerone.com/reports/1069487https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/E4FRS5ZVK4ZQ7XIJQNGIKUXG2DJFHLO7/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F45Y7TXSU33MTKB6AGL2Q5V5ZOCNPKOG/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSYFUGKFUSZ27M5TEZ3FKILWTWFJTFAZ/https://nodejs.org/en/blog/vulnerability/february-2021-security-releases/https://nodejs.org/en/blog/vulnerability/march-2018-security-releases/#node-js-inspector-dns-rebinding-vulnerability-cve-2018-7160https://security.netapp.com/advisory/ntap-20210416-0001/https://security.netapp.com/advisory/ntap-20210723-0001/https://www.oracle.com/security-alerts/cpuApr2021.htmlhttps://www.oracle.com//security-alerts/cpujul2021.htmlhttps://www.oracle.com/security-alerts/cpuoct2021.html