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exploitdbQian ZhangEDB-ID:40489
HistoryOct 10, 2016 - 12:00 a.m.

Linux Kernel 4.6.2 (Ubuntu 16.04.1) - 'IP6T_SO_SET_REPLACE' Local Privilege Escalation

2016-10-1000:00:00
Qian Zhang
www.exploit-db.com
128

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

8

Confidence

High

EPSS

0

Percentile

10.5%

# Exploit Title: Linux kernel <= 4.6.2 - Local Privileges Escalation via IP6T_SO_SET_REPLACE compat setsockopt call
# Date: 2016.10.8
# Exploit Author: Qian Zhang@MarvelTeam Qihoo 360
# Version: Linux kernel <= 4.6.2
# Tested on: Ubuntu 16.04.1 LTS Linux 4.4.0-21-generic
# CVE: CVE-2016-4997
# Reference:http://www.openwall.com/lists/oss-security/2016/09/29/10
# Contact: [email protected]

#DESCRIPTION
#===========
#The IPv6 netfilter subsystem in the Linux kernel through 4.6.2 does not validate certain offset fields,
#which allows local users to escalade privileges via an IP6T_SO_SET_REPLACE compat setsockopt call with ip6_tables module loaded.

zhang_q@ubuntu:~/ipv6_IP6T_SO_SET_REPLACE$ ls
compile.sh  enjoy  enjoy.c  pwn  pwn.c  version.h
zhang_q@ubuntu:~/ipv6_IP6T_SO_SET_REPLACE$ sudo modprobe ip6_tables
[sudo] password for zhang_q: 
zhang_q@ubuntu:~/ipv6_IP6T_SO_SET_REPLACE$ ./pwn 
pwn begin, let the bullets fly . . .
and wait for a minute . . .
pwn over, let's enjoy!
preparing payload . . .
trigger modified tty_release . . .
got root, enjoy :)
root@ubuntu:~/ipv6_IP6T_SO_SET_REPLACE# 
root@ubuntu:~/ipv6_IP6T_SO_SET_REPLACE# id
uid=0(root) gid=0(root) groups=0(root)
root@ubuntu:~/ipv6_IP6T_SO_SET_REPLACE# hostnamectl 
   Static hostname: ubuntu
         Icon name: computer-vm
           Chassis: vm
        Machine ID: 355cdf4ce8a048288640c2aa933c018f
    Virtualization: vmware
  Operating System: Ubuntu 16.04.1 LTS
            Kernel: Linux 4.4.0-21-generic
      Architecture: x86-64
root@ubuntu:~/ipv6_IP6T_SO_SET_REPLACE# 


Proof of Concept:
https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/40489.zip

CVSS2

7.2

Attack Vector

LOCAL

Attack Complexity

LOW

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:L/AC:L/Au:N/C:C/I:C/A:C

CVSS3

7.8

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

AI Score

8

Confidence

High

EPSS

0

Percentile

10.5%