1.修复的CVE
·CVE-2021-25220
描述：ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。ISC BIND 存在安全漏洞，该漏洞源于已经收紧了接受记录到缓存中的规则，以防止如果转发器在配置的范围之外发送记录可能会中毒。
2.受影响的软件包
·银河麒麟高级服务器操作系统 V10 SP1
aarch64架构:
bind、bind-chroot、bind-devel、bind-export-devel、bind-export-libs、bind-libs、bind-libs-lite、bind-pkcs11、bind-pkcs11-devel、bind-utils、python3-bind
x86_64架构:
bind、bind-chroot、bind-devel、bind-export-devel、bind-export-libs、bind-libs、bind-libs-lite、bind-pkcs11、bind-pkcs11-devel、bind-utils、python3-bind
3.软件包修复版本
·银河麒麟高级服务器操作系统 V10 SP1
bind-9.11.21-8.p01.ky10
bind-chroot-9.11.21-8.p01.ky10
bind-devel-9.11.21-8.p01.ky10
bind-export-devel-9.11.21-8.p01.ky10
bind-export-libs-9.11.21-8.p01.ky10
bind-libs-9.11.21-8.p01.ky10
bind-libs-lite-9.11.21-8.p01.ky10
bind-pkcs11-9.11.21-8.p01.ky10
bind-pkcs11-devel-9.11.21-8.p01.ky10
bind-utils-9.11.21-8.p01.ky10
python3-bind-9.11.21-8.p01.ky10
4.修复方法
方法一：配置源进行升级安装
1.打开软件包源配置文件，根据仓库地址进行修改。
仓库源地址：
银河麒麟高级服务器操作系统 V10 SP1
aarch64:https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/
x86_64:https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/
2.配置完成后执行更新命令进行升级，命令如下：
yum update Packagename
方法二：下载安装包进行升级安装
通过软件包地址下载软件包，使用软件包升级命令根据受影响的软件包列表进行升级安装,命令如下：
yum install Packagename
3.升级完成后是否需要重启服务或操作系统：
·CVE-2021-25220：无需重启操作系统与服务即可使漏洞修复生效。
5.软件包下载地址
·银河麒麟高级服务器操作系统 V10 SP1
bind（aarch64）软件包下载地址:
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-chroot-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-devel-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-export-devel-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-export-libs-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-libs-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-libs-lite-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-pkcs11-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-pkcs11-devel-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/bind-utils-9.11.21-8.p01.ky10.aarch64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/aarch64/Packages/python3-bind-9.11.21-8.p01.ky10.noarch.rpm
bind（x86_64）软件包下载地址:
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-chroot-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-devel-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-export-devel-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-export-libs-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-libs-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-libs-lite-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-pkcs11-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-pkcs11-devel-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/bind-utils-9.11.21-8.p01.ky10.x86_64.rpm
https://update.cs2c.com.cn/NS/V10/V10SP1.1/os/adv/lic/updates/x86_64/Packages/python3-bind-9.11.21-8.p01.ky10.noarch.rpm
注：其他相关依赖包请到相同目录下载
6.修复验证
使用软件包查询命令，查看相关软件包版本是否与修复版本一致，如果版本一致，则说明修复成功。
sudo rpm -qa | grep Packagename
