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Netfilter x_tables Heap OOB Write Privilege Escalation

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Netfilter x_tables Heap OOB Write Privilege Escalation

Disclosed
07/07/2021
Created
10/07/2021

Description

A heap out-of-bounds write affecting Linux since v2.6.19-rc1 was discovered in net/netfilter/x_tables.c. This allows an attacker to gain privileges or cause a DoS (via heap memory corruption) through user name space. Kernels up to 5.11 (including) are vulnerable. More information about vulnerable kernels is available at https://nvd.nist.gov/vuln/detail/CVE-2021-22555#vulnConfigurationsArea

Author(s)

  • Andy Nguyen (theflow <Andy Nguyen (theflow@)>
  • Szymon Janusz
  • bcoles <bcoles@gmail.com>

Platform

Linux

Architectures

x64

Development

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

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