Пользователям FreeBSD (и TrueBSD :))
Категория: Інфармацыйныя тэхналогіі Декабрь 2nd, 2009Наверное многие наслышаны об очень серьёзной уязвимости во FreeBSD (с 7.1 по 8.0), позволяющей получить root-доступ с под обычного пользователя (локально).
Ссылок на эксплоит выкладывать не буду, с целью чтобы было поменьше вредителей, но эксплоит только что собственноручно проверял и убедился в его работоспособности.
Дожидаться пока исправления включат в дерево cvs/svn у меня особого желания нет, да и систему вновь всю пересобирать как-то не очень тянет. Потому, предлагаю вашему вниманию более простой, но такой же эффективный способ исправления проблемы в четыре строчки:
% cd /usr/src/libexec/rtld-elf/
% fetch http://people.freebsd.org/~cperciva/rtld.patch
% cat rtld.patch | patch -p1
% make && make install && make clean
Всех благ!
Декабрь 2nd, 2009 at 15:01
Слабо представляю, где эту уязвимость можно применить в реальной жизни.
Декабрь 2nd, 2009 at 15:32
отличненько!!
%./exploit.sh
exploit.sh FreeBSD local r00t zeroday
by Kingcope
November 2009
env.c: In function ‘main’:
env.c:5: warning: incompatible implicit declaration of built-in function ‘malloc’
env.c:9: warning: incompatible implicit declaration of built-in function ‘strcpy’
env.c:11: warning: incompatible implicit declaration of built-in function ‘execl’
/libexec/ld-elf.so.1: environment corrupt; missing value for
/libexec/ld-elf.so.1: environment corrupt; missing value for
/libexec/ld-elf.so.1: environment corrupt; missing value for
/libexec/ld-elf.so.1: environment corrupt; missing value for
/libexec/ld-elf.so.1: environment corrupt; missing value for
ALEX-ALEX
#
Декабрь 3rd, 2009 at 21:43
drTr0jan,
1) SSH-доступ есть почти у всех клиентов более-менее вменяемого хостинга, а это значит что человек может получить rootshell на системе, к которой ему дали гостевой доступ.
2) SSH не нужен, достаточно взломать какой-нибудь php/perl/python-скрипт, выполняемый веб-сервером и rootshell у тебя в руках.
Декабрь 3rd, 2009 at 21:43
devnu11, всё-таки нашёл =)
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Very interesting and amusing subject. I read with great pleasure.
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In truth, immediately i didn’t understand the essence. But after re-reading all at once became clear.
Декабрь 18th, 2009 at 15:49
I really like your blog and i respect your work. I’ll be a frequent visitor.
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