1. 修复的CVE信息
CVE-2021-25219
ISC BIND是美国ISC公司的一套实现了DNS协议的开源软件。BIND 中存在资源管理错误漏洞，该漏洞源于产品的授权服务器的相应处理存在错误。攻击者可通过该漏洞导致BIND解析器性能下降进而导致查询处理延迟。
2. 影响的操作系统
银河麒麟桌面操作系统V4 SP1
银河麒麟桌面操作系统V4 SP2
银河麒麟桌面操作系统V4 SP3
银河麒麟桌面操作系统V4 SP4
银河麒麟桌面操作系统V10
银河麒麟服务器操作系统V4 SP1
银河麒麟服务器操作系统V4 SP2
银河麒麟服务器操作系统V4 SP3
银河麒麟服务器操作系统V4 SP4
银河麒麟桌面操作系统V10 SP1
3. 修复版本
软件包：strongswan
9.10.3.dfsg.P4-8kord1.19+esm1（V4、V10）
9.16.1-0kylin2.9（V10 SP1）
4. 受影响的软件包
银河麒麟桌面操作系统V10、V4
bind9
bind9-dnsutils
bind9-doc
bind9-host
bind9-libs
bind9-utils
bind9utils
dnsutils
银河麒麟桌面操作系统V10 SP1
bind9
bind9-dnsutils
bind9-doc
bind9-host
bind9-libs
bind9-utils
bind9utils
dnsutils
5. 修复方法
方法一：配置源进行升级安装
打开软件包源配置文件，根据仓库地址进行修改。
4.0.2-sp1:http://archive.kylinos.cn/kylin/KYLIN-ALL 4.0.2sp1-desktop main restricted universe multiverse
4.0.2-sp2:http://archive.kylinos.cn/kylin/KYLIN-ALL 4.0.2sp2-desktop main restricted universe multiverse
4.0.2-sp3:http://archive.kylinos.cn/kylin/KYLIN-ALL 4.0.2sp3-desktop main restricted universe multiverse
4.0.2-sp4:http://archive.kylinos.cn/kylin/KYLIN-ALL 4.0.2sp4-desktop main restricted universe multiverse
10.0:http://archive.kylinos.cn/kylin/KYLIN-ALL 10.0 main restricted universe multiverse
10.0 SP1:http://archive.kylinos.cn/kylin/KYLIN-ALL 10.1 main restricted universe multiverse
配置完成后执行更新命令进行升级。$sudo apt update
方法二：下载安装包进行升级安装
通过软件包地址下载软件包，使用软件包升级命令根据受影响的组件包列表 升级相关的组件包。$dpkg -i Packagelists
6. 软件包下载地址
银河麒麟桌面操作系统V10、V4
X86_64软件包下载地址：
arm64软件包下载地址：
银河麒麟桌面操作系统V10 SP1
X86_64软件包下载地址：
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/dnsutils_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9_9.16.1-0kylin2.9_amd64.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9utils_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-doc_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-host_9.16.1-0kylin2.9_amd64.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-libs_9.16.1-0kylin2.9_amd64.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-utils_9.16.1-0kylin2.9_amd64.deb
arm64软件包下载地址：
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/dnsutils_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9_9.16.1-0kylin2.9_arm64.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9utils_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-doc_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-host_9.16.1-0kylin2.9_arm64.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-libs_9.16.1-0kylin2.9_arm64.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-utils_9.16.1-0kylin2.9_arm64.deb
mips64el软件包下载地址：
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/dnsutils_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9_9.16.1-0kylin2.9_mips64el.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9utils_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-doc_9.16.1-0kylin2.9_all.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-host_9.16.1-0kylin2.9_mips64el.deb
http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/b/bind9/bind9-libs_9.16.1-0kylin2.9_mips64el.deb
