Apache Dubbo vulnerable to remote code execution via Telnet Handler

緊急 9.8CVE-2021-32824 · GHSA-fprr-rrm8-4534 · 03/01/2023 公開 · 17/06/2026 更新

要点

CVE-2021-32824 は org.apache.dubbo:dubbo-parent, dubbo (apache) に影響する深刻度「緊急」 (CVSS 9.8) の脆弱性です。
今後30日間に悪用される確率（EPSS）：3.2%（全脆弱性の 88.2% より高い）。
対処：2.7.10, 2.6.10 以降に更新してください。

パッケージ	影響を受けるバージョン	修正済みバージョン
org.apache.dubbo:dubbo-parent Maven	`≥ 2.7.0, < 2.7.10< 2.6.10`	`2.7.102.6.10`
dubbo apache	`≥ 2.7.0, < 2.7.10< 2.6.10`	`2.7.102.6.10`

概要

Apache Dubbo is a Java based, open source RPC framework. Versions prior to 2.6.10 and 2.7.10 are vulnerable to pre-authorization remote code execution via arbitrary bean manipulation in the Telnet handler. The Dubbo main service port can be used to access a Telnet Handler which offers some basic methods to collect information about the providers and methods exposed by the service and it can even allow to shutdown the service. This endpoint is unprotected.

Additionally, a provider method can be invoked using the invoke handler. This handler uses a safe version of FastJson to process the call arguments. However, the resulting list is later processed with PojoUtils.realize which can be used to instantiate arbitrary classes and invoke its setters. Even though FastJson is properly protected with a default blocklist, PojoUtils.realize is not, and an attacker can leverage that to achieve remote code execution.

Versions 2.6.10 and 2.7.10 contain fixes for this issue.

NVD の説明

Apache Dubbo is a java based, open source RPC framework. Versions prior to 2.6.10 and 2.7.10 are vulnerable to pre-auth remote code execution via arbitrary bean manipulation in the Telnet handler. The Dubbo main service port can be used to access a Telnet Handler which offers some basic methods to collect information about the providers and methods exposed by the service and it can even allow to shutdown the service. This endpoint is unprotected. Additionally, a provider method can be invoked using the `invoke` handler. This handler uses a safe version of FastJson to process the call arguments. However, the resulting list is later processed with `PojoUtils.realize` which can be used to instantiate arbitrary classes and invoke its setters. Even though FastJson is properly protected with a default blocklist, `PojoUtils.realize` is not, and an attacker can leverage that to achieve remote code execution. Versions 2.6.10 and 2.7.10 contain fixes for this issue.