1. 修復的CVE

CVE-2021-3155

Snapd是開源的一個跨平臺的包管理工具。snapd 2.54.2及其更早版本存在安全漏洞，該漏洞源于軟件在用戶的主目錄中創建~ snap目錄，而沒有指定僅屬于所有者的權限。這可能允許本地攻擊者可利用該漏洞讀取本應是私有的信息。

CVE-2021-4120

Snapd是開源的一個跨平臺的包管理工具。snapd 2.54.2版本存在安全漏洞，該漏洞源于軟件未能對snap內容界面和布局路徑執行充分的驗證，導致snap能夠通過變形的內容界面和布局聲明注入任意的AppArmor策略規則，從而逃脫嚴格的snap限制。

CVE-2021-44730

Snapd是開源的一個跨平臺的包管理工具。snapd 2.54.2 版本存在后置鏈接漏洞，該漏洞源于沒有正確驗證snap- restricted二進制文件的位置。本地攻擊者可利用該漏洞，可以將這個二進制文件硬鏈接到另一個位置，從而導致snap-限制執行其他任意二進制文件，從而獲得特權升級。

CVE-2021-44731

Snapd是開源的一個跨平臺的包管理工具。snapd 2.54.2版本存在競爭條件問題漏洞，該漏洞源于當為snap準備私有掛載命名空間時，snap2.54.2 snap- restricted二進制文件中存在一個競爭條件。這可能允許本地攻擊者可利用該漏洞通過在snap的私有掛載名稱空間中綁定掛載自己的內容，從而獲得根權限，并執行任意代碼，從而獲得權限升級。

2. 受影響的操作系統及軟件包

·銀河麒麟桌面操作系統V10 SP1

x86_64 架構：

snap-confine、snapd-xdg-open、snapd、ubuntu-core-launcher、ubuntu-core-snapd-units、ubuntu-snappy-cli、ubuntu-snappy

arm64 架構：

snap-confine、snapd-xdg-open、snapd、ubuntu-core-launcher、ubuntu-core-snapd-units、ubuntu-snappy-cli、ubuntu-snappy

mips64el 架構：

snap-confine、snapd-xdg-open、snapd、ubuntu-core-launcher、ubuntu-core-snapd-units、ubuntu-snappy-cli、ubuntu-snappy

loongarch64 架構：

snap-confine、snapd-xdg-open、snapd、ubuntu-core-launcher、ubuntu-core-snapd-units、ubuntu-snappy-cli、ubuntu-snappy

3. 軟件包修復版本

·銀河麒麟桌面操作系統V10 SP1

2.54.3+20.04.1kylin0.2k3

5.4. 修復方法

方法一：配置源進行升級安裝

打開軟件包源配置文件，根據倉庫地址進行修改。

10.0 SP1:

http://archive.kylinos.cn/kylin/KYLIN-ALL 10.1 main restricted universe multiverse

配置完成后執行更新命令進行升級

$sudo apt update

$sudo apt install snapd

方法二：下載軟件包進行升級安裝

通過軟件包地址下載軟件包，使用軟件包升級命令根據受影響的軟件包列表升級相關的組件包。

$sudo dpkg -i /Path1/Package1 /Path2/Package2 /Path3/Package3……

注：Path 指軟件包下載到本地的路徑，Package指下載的軟件包名稱，多個軟件包則以空格分開。

5. 軟件包下載地址

銀河麒麟桌面操作系統V10 SP1

x86_64軟件包下載地址

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snap-confine_2.54.3%2B20.04.1kylin0.2k3_amd64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd-xdg-open_2.54.3%2B20.04.1kylin0.2k3_amd64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd_2.54.3%2B20.04.1kylin0.2k3_amd64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-launcher_2.54.3%2B20.04.1kylin0.2k3_amd64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-snapd-units_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy-cli_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy_2.54.3%2B20.04.1kylin0.2k3_all.deb

arm64軟件包下載地址

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snap-confine_2.54.3%2B20.04.1kylin0.2k3_arm64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd-xdg-open_2.54.3%2B20.04.1kylin0.2k3_arm64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd_2.54.3%2B20.04.1kylin0.2k3_arm64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-launcher_2.54.3%2B20.04.1kylin0.2k3_arm64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-snapd-units_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy-cli_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy_2.54.3%2B20.04.1kylin0.2k3_all.deb

mips64el軟件包下載地址

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snap-confine_2.54.3%2B20.04.1kylin0.2k3_mips64el.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd-xdg-open_2.54.3%2B20.04.1kylin0.2k3_mips64el.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd_2.54.3%2B20.04.1kylin0.2k3_mips64el.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-launcher_2.54.3%2B20.04.1kylin0.2k3_mips64el.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-snapd-units_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy-cli_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy_2.54.3%2B20.04.1kylin0.2k3_all.deb

loongarch64軟件包下載地址

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snap-confine_2.54.3%2B20.04.1kylin0.2k3_loongarch64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd-xdg-open_2.54.3%2B20.04.1kylin0.2k3_loongarch64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/snapd_2.54.3%2B20.04.1kylin0.2k3_loongarch64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-launcher_2.54.3%2B20.04.1kylin0.2k3_loongarch64.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-core-snapd-units_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy-cli_2.54.3%2B20.04.1kylin0.2k3_all.deb

http://archive.kylinos.cn/kylin/KYLIN-ALL/pool/main/s/snapd/ubuntu-snappy_2.54.3%2B20.04.1kylin0.2k3_all.deb

6. 修復驗證

使用軟件包查詢命令，查看相關的軟件包版本大于或等于修復版本則成功修復。

$sudo dpkg -l |grep Package

注：Package為軟件包包名。