CVE-2023-5072: Java: DoS Vulnerability in JSON-JAVA
(updated )
A denial of service vulnerability in JSON-Java was discovered by ClusterFuzz. A bug in the parser means that an input string of modest size can lead to indefinite amounts of memory being used. There are two issues: (1) the parser bug can be used to circumvent a check that is supposed to prevent the key in a JSON object from itself being another JSON object; (2) if a key does end up being a JSON object then it gets converted into a string, using \ to escape special characters, including \ itself. So by nesting JSON objects, with a key that is a JSON object that has a key that is a JSON object, and so on, we can get an exponential number of \ characters in the escaped string.
References
- github.com/advisories/GHSA-4jq9-2xhw-jpx7
- github.com/google/security-research/security/advisories/GHSA-4jq9-2xhw-jpx7
- github.com/stleary/JSON-java
- github.com/stleary/JSON-java/commit/60662e2f8384d3449822a3a1179bfe8de67b55bb
- github.com/stleary/JSON-java/issues/758
- github.com/stleary/JSON-java/issues/771
- github.com/stleary/JSON-java/pull/759
- nvd.nist.gov/vuln/detail/CVE-2023-5072
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