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CVE-2021-22569— Denial of Service of protobuf-java parsing procedure

Quick assessment

Affected
Google LLC protobuf-java
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Google protobuf是美国谷歌（Google）公司的一种数据交换格式。 Google protobuf java 存在安全漏洞，该漏洞允许一个小的恶意负载可以通过创建大量导致频繁、重复暂停的短期对象来占用解析器几分钟。

CVSS 7.5 · High EPSS 1.67% · P75

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-22569

Vulnerability Information
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Vulnerability Title
Denial of Service of protobuf-java parsing procedure
Source: CVE Program / CVE List V5
Vulnerability Description
An issue in protobuf-java allowed the interleaving of com.google.protobuf.UnknownFieldSet fields in such a way that would be processed out of order. A small malicious payload can occupy the parser for several minutes by creating large numbers of short-lived objects that cause frequent, repeated pauses. We recommend upgrading libraries beyond the vulnerable versions.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不正确的行为次序
Source: CVE Program / CVE List V5
Vulnerability Title
Google protobuf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Google protobuf是美国谷歌（Google）公司的一种数据交换格式。 Google protobuf java 存在安全漏洞，该漏洞允许一个小的恶意负载可以通过创建大量导致频繁、重复暂停的短期对象来占用解析器几分钟。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Google LLC protobuf-java unspecified ~ 3.16.1 -
Google LLC protobuf-kotlin unspecified ~ 3.18.2 -
Google LLC google-protobuf [JRuby Gem] unspecified ~ 3.19.2 -

II. Public POCs for CVE-2021-22569

# POC Description Source Link Shenlong Link
1 A potential Denial of Service issue in protobuf-java high severity GitHub Reviewed Published 5 days ago in protocolbuffers/protobuf • Updated yesterday Vulnerability details Dependabot alerts 2 Package com.google.protobuf:protobuf-java (maven) Affected versions < 3.16.1 >= 3.18.0, < 3.18.2 >= 3.19.0, < 3.19.2 Patched versions 3.16.1 3.18.2 3.19.2 Package com.google.protobuf:protobuf-kotlin (maven) Affected versions >= 3.18.0, < 3.18.2 >= 3.19.0, < 3.19.2 Patched versions 3.18.2 3.19.2 Package google-protobuf (RubyGems) Affected versions < 3.19.2 Patched versions 3.19.2 Description 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 only] (3.19.2) References GHSA-wrvw-hg22-4m67 https://nvd.nist.gov/vuln/detail/CVE-2021-22569 https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=39330 https://cloud.google.com/support/bulletins#gcp-2022-001 https://github.com/Mario-Kart-Felix/A-potential-Denial-of-Service-issue-in-protobuf-java POC Details
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III. Intelligence Information for CVE-2021-22569

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Vendor Advisories for CVE-2021-22569 (1)

Mailing List Discussions for CVE-2021-22569 (1)

Other References for CVE-2021-22569 (2)

IV. Related Vulnerabilities

Same vendor: Google LLC
Same weakness: CWE-696

V. Comments for CVE-2021-22569

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