CVE:CVE-2021-38173
CNNVD:CNNVD-202108-707
btrbk是一个应用软件。 btrfs 子卷的备份工具，利用 btrfs 特定功能创建原子快照并将它们增量传输到您的备份位置。
btrbk存在安全漏洞。由于远程主机使用authorized_keys中ssh_filter_btrbk.sh过滤SSH命令的错误处理，0.31.2之前的Btrbk允许命令执行。
solution:Upgrade digint btrbk to a higher version than 0.31.2,and avoid the version (,0.31.2); Upgrade debian debian_linux to a higher version than 9.0,and avoid the version 9.0; Upgrade fedoraproject fedora to a higher version than 34,35,and avoid the version 34,35