Date: Wed, 12 Jan 2022 13:32:51 +0100 From: Ana Oprea <anaoprea@...gle.com> To: oss-security@...ts.openwall.com Subject: CVE-2021-22569: Protobuf Java, Kotlin, JRuby DoS Summary A potential Denial of Service issue in protobuf-java was discovered in the parsing procedure for binary data. - Reporter: OSS-Fuzz  - Affected versions: All versions of Java Protobufs (including Kotlin and JRuby) prior to the versions listed below. Protobuf "javalite" users (typically Android) are not affected. Severity CVE-2021-22569 High - CVSS Score: 7.5  An implementation weakness in how unknown fields are parsed in Java. A small (~800 KB) malicious payload can occupy the parser for several minutes by creating large numbers of short-lived objects that cause frequent, repeated GC pauses. Proof of Concept For reproduction details, please refer to the oss-fuzz issue  that identifies the specific inputs that exercise this parsing weakness. Remediation and Mitigation Please update to the latest available versions of the following packages: - protobuf-java (3.16.1, 3.18.2, 3.19.2) - protobuf-kotlin (3.18.2, 3.19.2) - google-protobuf [JRuby gem] (3.19.2)  https://github.com/google/oss-fuzz  https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22569  https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39330 Kind regards, Ana
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