Description
The Linux kernel failed to properly initialize some entries in the proto_ops struct for several protocols, leading to NULL being dereferenced and used as a function pointer. By using mmap(2) to map page 0, an attacker can execute arbitrary code in the context of the kernel.
Several public exploits exist for this vulnerability, including spender's wunderbar_emporium and rcvalle's ppc port, sock_sendpage.c.
All Linux 2.4/2.6 versions since May 2001 are believed to be affected: 2.4.4 up to and including 2.4.37.4; 2.6.0 up to and including 2.6.30.4
This module has been tested successfully on CentOS 5.0 (i386) with kernel version 2.6.18-8.1.1.tl5; and Debian 3.1r8 Sarge (i686) with kernel version 2.4.27-3-386.
Module options
To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':
msf > use exploit/linux/local/sock_sendpagemsf undefined(sock_sendpage) > show actions ...actions...msf undefined(sock_sendpage) > set ACTION < action-name >msf undefined(sock_sendpage) > show options ...show and set options...msf undefined(sock_sendpage) > runPrioritise with Active Threat Intelligence
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