Tomcat爆出安全漏洞！Spring Cloud/Boot框架多个版本受影响

01 事件背景

6月25日， Apache 官方安全团队通过邮件公开报告了一个高危漏洞，邮件中介绍了 HTTP/2 拒绝服务漏洞的细节及解决方案。如下图所示：

漏洞详情链接：

• http://mail-archives.apache.org/mod_mbox/www-announce/202006.mbox/%3Cfd56bc1d-1219-605b-99c7-946bf7bd8ad4@apache.org%3E

翻译

• 漏洞名称：Apache Tomcat HTTP/2 拒绝服务漏洞
• 漏洞编号：CVE-2020-11996
• 严重程度: 重要
• 软件提供商: Apache 软件基金会

受影响的版本：

• Apache Tomcat 10.0.0-M1 ~ 10.0.0-M5
• Apache Tomcat 9.0.0.M1 ~ 9.0.35
• Apache Tomcat 8.5.0 ~ 8.5.55

漏洞描述：一个特别制作的 HTTP/2 请求序列，在短短数秒内能导致 CPU 满负载率，如果有足够数量多的此类请求连接(HTTP/2)并发放在服务器上，服务器可能会失去响应。

如果条件允许，可以通过升级到Tomcat新版本来解决漏洞。下面为受影响版本对应的安全版本：

• Apache Tomcat 10.0.0-M6+
• Apache Tomcat 9.0.36+
• Apache Tomcat 8.5.56+

02 Spring Cloud / Boot 框架影响

Apache Tomcat HTTP/2 拒绝服务漏洞也给Spring Cloud / Boot 框架带来了一定的影响。下面是所有受影响的版本列表，大家可以查看并对照下自己的代码，看看是否受到影响。

Spring Cloud Edgware / Spring Boot 1.5.x

• Spring Cloud [Edgware.RELEASE - Edgware.SR6] 版本受到影响。
• Spring Boot [1.5.0.RELEASE - 1.5.22.RELEASE] 版本受到影响。

Spring Cloud Finchley / Spring Boot 2.0.x

• Spring Cloud [Finchley.RELEASE - Finchley.SR4] 版本受到影响。
• Spring Boot [2.0.0.RELEASE - 2.0.9.RELEASE] 版本受到影响。

Spring Cloud Greenwich / Spring Boot 2.1.x

• Spring Cloud [Greenwich.RELEASE - Greenwich.SR6] 版本受到影响。
• Spring Boot [2.1.0.RELEASE - 2.1.14.RELEASE] 版本受到影响。
• Spring Boot [2.1.15.RELEASE] 版本已修复。

Spring Cloud Hoxton / Spring Boot 2.2.x

• Spring Cloud [Hoxton.RELEASE - Hoxton.SR6] 版本受到影响。
• Spring Boot [2.2.0.RELEASE - 2.2.7.RELEASE] 版本受到影响。
• Spring Boot [2.2.8.RELEASE] 版本已修复。

Spring Boot 2.3.x

• Spring Boot [2.3.0.RELEASE] 版本受到影响。
• Spring Boot [2.3.1.RELEASE] 版本已修复。

03 升级方案

为了避免上述漏洞，现有两种升级方案：

直接升级Spring Boot版本。

手动升级Tomcat版本。

升级 Spring Cloud Edgware / Spring Boot 1.5.x

Edgware无法通过升级Spring Boot版本解决问题。=

<properties> 
    <tomcat-embed.version>8.5.56</tomcat-embed.version> 
</properties> 
 
<dependencyManagement> 
    <dependencies> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-core</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-el</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-websocket</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat</groupId> 
            <artifactId>tomcat-annotations-api</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
    </dependencies> 
</dependencyManagement> 

升级Spring Cloud Finchley / Spring Boot 2.0.x

Finchley无法通过升级Spring Boot版本解决问题。

<properties> 
    <tomcat-embed.version>8.5.56</tomcat-embed.version> 
</properties> 
 
<dependencyManagement> 
    <dependencies> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-core</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-el</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-websocket</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
    </dependencies> 
</dependencyManagement> 

升级Spring Cloud Greenwich / Spring Boot 2.1.x

1. 升级Spring Boot

<parent> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-parent</artifactId> 
    <version>2.1.15.RELEASE</version> 
</parent> 

2. 升级Tomcat

<properties> 
    <tomcat-embed.version>9.0.36</tomcat-embed.version> 
</properties> 
 
<dependencyManagement> 
    <dependencies> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-core</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-el</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-websocket</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
    </dependencies> 
</dependencyManagement> 

升级Spring Cloud Hoxton / Spring Boot 2.2.x

1. 升级Spring Boot

<parent> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-parent</artifactId> 
    <version>2.2.8.RELEASE</version> 
</parent> 

2. 升级Tomcat

<properties> 
    <tomcat-embed.version>9.0.36</tomcat-embed.version> 
</properties> 
 
<dependencyManagement> 
    <dependencies> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-core</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-el</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-websocket</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
    </dependencies> 
</dependencyManagement> 

升级Spring Boot 2.3.x

1. 升级Spring Boot

<parent> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-parent</artifactId> 
    <version>2.3.1.RELEASE</version> 
</parent> 

2. 升级Tomcat

<properties> 
    <tomcat-embed.version>9.0.36</tomcat-embed.version> 
</properties> 
 
<dependencyManagement> 
    <dependencies> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-core</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency> 
        <dependency> 
            <groupId>org.apache.tomcat.embed</groupId> 
            <artifactId>tomcat-embed-websocket</artifactId> 
            <version>${tomcat-embed.version}</version> 
        </dependency>    </dependencies></dependencyManagement>