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测试了一把,结果显示360基本对Linux社区规范和安全常识不give a fuck。
首先,这个deb包就是胡乱打包,依赖关系就没弄好:
$ dpkg-deb -I 360safeforlinux-3.0.0.66-stripped.deb [...] Package: 360safeforlinux Version: 3.0.0.66 Architecture: amd64 Maintainer: qihu360 company Installed-Size: 23617 Depends: libc6 (>= 2.14),libglib2.0-0 (>= 2.38),python2.7 (>= 2.7.6),openssl(>= 1.0),curl,libqt4-network(>= 4.8.5),libqt4-sql(>= 4.8.5) Section: gnome Priority: required Essential: yes Description: 360 safe for linux
但是还实际依赖了libpython2.7和libqtgui4两个库没有标明,要我手动修复。
这个打包还通过滥用Essential标记来制造卸载的麻烦。
root@debian-amd64:/home/user# apt-get remove 360safeforlinux [...] The following packages will be REMOVED: 360safeforlinux WARNING: The following essential packages will be removed. This should NOT be done unless you know exactly what you are doing! 360safeforlinux [...] **You are about to do something potentially harmful.** To continue type in the phrase ‘Yes, do as I say!‘ ?] Abort. root@debian-amd64:/home/user# aptitude remove 360safeforlinux The following packages will be REMOVED: 360safeforlinux [...] The following ESSENTIAL packages will be REMOVED! 360safeforlinux WARNING: Performing this action will probably cause your system to break! Do NOT continue unless you know EXACTLY what you are doing! To continue, type the phrase "I am aware that this is a very bad idea":
关于Essential打包政策, Debian 和 Ubuntu 都只保留给最必要的包。
安装后dpkg配置时它的postinst脚本直接给加上了setuid。如此随意地使用setuid,还能自称是安全?
if [ "$1" = "configure" ];then chmod u+s /opt/360safeforlinux/s360SafeForLinux [...] fi
这个的意思就是,以普通用户权限运行这个东西,它会变成root:
user@debian-amd64:~$ id uid=1000(user) gid=1000(user) groups=1000(user),24(cdrom),25(floppy),29(audio),30(dip),44(video),46(plugdev) user@debian-amd64:~$ start360 & [1] 4512 user@debian-amd64:~$ pstree -u init─┬─dhclient ├─5*[getty] ├─login───bash(user)───startx───xinit─┬─Xorg(root) │ └─x-window-manage [...] ├─urxvtd(user) └─urxvtd(user)─┬─bash───start360(root)─┬─{BackendTaskThre} │ ├─{BrowserHomePage} │ ├─{CpuMemUseState} │ ├─{FileWatcher} │ ├─{IsolateZone} │ ├─{LogCleanThread} │ ├─2*[{MyThread}] │ ├─{VdUpload} │ └─3*[{start360}] └─bash───pstree
dpkg的prerm脚本还有奇怪的东西:
rc=`lsmod | grep "rk360" | xargs echo` if [ -n "$rc" ];then rmmod rk360 2>/dev/null 1>&2 rm -rf /etc/360safe/360safe.ko 2>/dev/null 1>&2 fi rc=`lsmod | grep "immu" | xargs echo` if [ -n "$rc" ];then rmmod immu 2>/dev/null 1>&2 rm -rf /etc/360safe/immu.ko 2>/dev/null 1>&2 fi
360不仅不满足于root权限,还在用内核模块?不过这次使用中并未发现这两个内核模块。
start360启动,然后有两个运行时怪现状:
它提供了一些功能。
./etc/360safe/urlcheck ./etc/360safe/urlcheck/normalize.py ./etc/360safe/urlcheck/Firefox ./etc/360safe/urlcheck/Firefox/360webshield@qihoo.com.xpi ./etc/360safe/urlcheck/lcloud.ini ./etc/360safe/urlcheck/browserextensionsinstaller.py ./etc/360safe/urlcheck/Chrome ./etc/360safe/urlcheck/Chrome/360WebShield.crx
360唯有一点用功了,就是列了一大堆非GPL的许可证:
license/zlib_license.txt license/c-ares_license.txt license/qt_license_lgpl.txt license/unrar_license.txt license/sqlite_license.txt license/elftoolchain_license.txt license/libcurl_license.txt license/7-Zip_license.txt license/boost_license.txt license/openssl_licnese.txt license/minizip_license.txt license/jsoncpp_license.txt license/protobuf_license.txt license/Noto fonts_license.txt license/qt_lgpl_exception.txt
这样人们就无权索要源代码。不过,一个安全产品不公开源代码,然后用setuid拿了root还要搞内核模块,谁知道你要干嘛?总之,360对Linux社区规范和安全常识基本不give a fuck。
首先,用setuid给一个图形网络程序整体提权到root就是自送漏洞,全身是洞,只要发现一个,就是远程root。
其次,用户界面永远不需要root,提权进行特定动作特定配置有polkit,更新系统配置文件可以有facl可以有SELinux/AppArmor,内核级文件扫描可以有auditd,这些机制都不需要一个以root运行的用户界面造成巨大的攻击面。
第三,以root权限运行网上下载的二进制文件是一切病毒发生的起源。尤其是这种既没有源代码可审计,也没有数字签名可验证真实性的东西。
注:本站对本文有部分修改。原文来自: http://www.v2ex.com/t/158380
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原文地址:http://www.cnblogs.com/ahdd/p/4205288.html