Varnish Cache是一个高性能的HTTP加速器。它将网页存储在内存中，因此网络服务器不必一遍又一遍地创建相同的网页，从而显着提高网站速度。

8月2日,RedHat发布了安全更新，修复了红帽Varnish HTTP加速器中发现的请求走私攻击漏洞(HTTP请求走私是一种干扰网站处理HTTP请求序列方式的技术，使攻击者可以绕过安全控制，未经授权访问敏感数据并直接危害其他应用程序用户)。以下是漏洞详情：

漏洞详情

来源：https://access.redhat.com/errata/RHSA-2021:2988

CVE-2021-36740 CVSS评分：8.1 严重程度：高

在Varnish中发现了一个漏洞,启用HTTP/2的Varnish缓存允许通过POST请求的大型Content-Length标头进行请求走私和VCL授权绕过。此漏洞的最大威胁是机密性、完整性和系统可用性。

受影响产品和版本

Red Hat Enterprise Linux for x86_64 8 x86_64

Red Hat Enterprise Linux for x86_64 – Extended Update Support 8.4 x86_64

Red Hat Enterprise Linux for x86_64 – Extended Update Support 8.2 x86_64

Red Hat Enterprise Linux for x86_64 – Extended Update Support 8.1 x86_64

Red Hat Enterprise Linux Server – AUS 8.4 x86_64

Red Hat Enterprise Linux Server – AUS 8.2 x86_64

Red Hat Enterprise Linux for IBM z Systems 8 s390x

Red Hat Enterprise Linux for IBM z Systems – Extended Update Support 8.4 s390x

Red Hat Enterprise Linux for IBM z Systems – Extended Update Support 8.2 s390x

Red Hat Enterprise Linux for IBM z Systems – Extended Update Support 8.1 s390x

Red Hat Enterprise Linux for Power, little endian 8 ppc64le

Red Hat Enterprise Linux for Power, little endian – Extended Update Support 8.4 ppc64le

Red Hat Enterprise Linux for Power, little endian – Extended Update Support 8.2 ppc64le

Red Hat Enterprise Linux for Power, little endian – Extended Update Support 8.1 ppc64le

Red Hat Enterprise Linux Server – TUS 8.4 x86_64

Red Hat Enterprise Linux Server – TUS 8.2 x86_64

Red Hat Enterprise Linux for ARM 64 8 aarch64

Red Hat Enterprise Linux for ARM 64 – Extended Update Support 8.4 aarch64

Red Hat Enterprise Linux for ARM 64 – Extended Update Support 8.2 aarch64

Red Hat Enterprise Linux for ARM 64 – Extended Update Support 8.1 aarch64

Red Hat Enterprise Linux Server (for IBM Power LE) – Update Services for SAP Solutions 8.4 ppc64le

Red Hat Enterprise Linux Server (for IBM Power LE) – Update Services for SAP Solutions 8.2 ppc64le

Red Hat Enterprise Linux Server (for IBM Power LE) – Update Services for SAP Solutions 8.1 ppc64le

Red Hat Enterprise Linux Server – Update Services for SAP Solutions 8.4 x86_64

Red Hat Enterprise Linux Server – Update Services for SAP Solutions 8.2 x86_64

Red Hat Enterprise Linux Server – Update Services for SAP Solutions 8.1 x86_64

解决方案

Varnish:6 模块的更新现在可用于红帽企业 Linux 8、红帽企业 Linux 8.1 扩展更新支持和红帽企业 Linux 8.2 扩展更新支持。

有关如何应用此更新(包括本公告中描述的更改)的详细信息，请参阅：

https://access.redhat.com/articles/11258

查看更多漏洞信息 以及升级请访问官网：

https://access.redhat.com/security/security-updates/#/security-advisories