module

Linux Kernel Sendpage Local Privilege Escalation

Disclosed	Created
2009-08-13	2018-05-30

Disclosed

2009-08-13

Created

2018-05-30

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.

Authors

Tavis Ormandy
Julien Tinnes julien at cr0.org
spender
rcvalle
egypt egypt@metasploit.com

Platform

Linux

Architectures

x86

References

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_sendpage
    msf exploit(sock_sendpage) > show targets
        ...targets...
    msf exploit(sock_sendpage) > set TARGET < target-id >
    msf exploit(sock_sendpage) > show options
        ...show and set options...
    msf exploit(sock_sendpage) > exploit

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