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CVE-2020-8277 is a denial-of-service vulnerability in c-ares DNS reply parsing as used by Node.js. The ares_parse_a_reply() and ares_parse_aaaa_reply() functions insufficiently validate naddrttls values. A vulnerable application that permits an attacker to cause DNS resolution of an attacker-selected hostname can be induced to process a DNS record containing a large number of responses, causing denial of service. Node.js releases before 15.2.1, 14.15.1, and 12.19.1 are affected.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a Proof-of-Concept (PoC) exploit for CVE-2020-8277, a Denial of Service (DoS) vulnerability in Node.js (< v15.2.1) related to DNS resolution. The exploit consists of a Dockerized BIND DNS server configured to serve a zone file ('masahiro331.com.zone') with an extremely large number of A records for the subdomain 'evil.masahiro331.com'. The main exploit script ('main.js') uses Node.js's 'dns' module to resolve 'evil.masahiro331.com' via the local DNS server (127.0.0.1). When run against a vulnerable Node.js version, this triggers a read out of memory error, resulting in a DoS condition. The repository includes all necessary configuration files to build and run the malicious DNS server in a container, as well as instructions for setting up a vulnerable Node.js environment. The exploit does not provide shell access or code execution, but demonstrates the ability to crash or destabilize Node.js processes via crafted DNS responses.
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8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A denial-of-service vulnerability in c-ares involving insufficient validation of naddrttls in ares_parse_a_reply() and ares_parse_aaaa_reply(), affecting Rocky Linux 8 packages covered by the advisory.
A denial-of-service vulnerability in c-ares caused by insufficient naddrttls validation in ares_parse_a_reply() and ares_parse_aaaa_reply().
A denial-of-service vulnerability in c-ares due to insufficient naddrttls validation in ares_parse_a_reply() and ares_parse_aaaa_reply().
A denial-of-service vulnerability in c-ares due to insufficient naddrttls validation in ares_parse_a_reply() and ares_parse_aaaa_reply().
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Cross-references every affected SKU, including bundled OEM variants.
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