Security advisory

{
  "id": "b8aeec3d1df68b8d81d372c584f328cd154f43655629409ebb029a4b77514bb7",
  "url": "https://osv.dev/vulnerability/CVE-2020-8905",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2020-8905",
    "summary": "A buffer length validation vulnerability in Asylo versions prior to 0.6.0 allows an attacker to read data they should not have access to. The 'enc_untrusted_recvfrom' function generates a return value which is deserialized by 'MessageReader', and copied into three different 'extents'. The length of the third 'extents' is controlled by the outside world, and not verified on copy, allowing the attacker to force Asylo to copy trusted memory data into an untrusted buffer of significantly small length.. We recommend updating Asylo to version 0.6.0 or later.",
    "evidence": "osv:CVE-2020-8905",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2020-8905",
      "aliases": [
        "CVE-2020-8905"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/google/asylo",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "299f804acbb95a612ab7c504d25ab908aa59ae93"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:google:asylo:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.6.0"
                      }
                    ],
                    "source": "CPE_RANGE"
                  },
                  {
                    "range": [
                      {
                        "fixed": "299f804acbb95a612ab7c504d25ab908aa59ae93"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v0.5.3",
            "buildenv-v0.5.3",
            "v0.5.2",
            "buildenv-v0.5.2",
            "v0.5.1",
            "buildenv-v0.5.1",
            "v0.5.0",
            "buildenv-v0.5.0",
            "v0.4.1",
            "buildenv-v0.4.1",
            "v0.4.0",
            "buildenv-v0.4.0",
            "v0.3.4.1",
            "v0.3.4",
            "buildenv-v0.3.4",
            "v0.3.3",
            "buildenv-v0.3.3",
            "v0.3.2",
            "buildenv-v0.3.2",
            "v0.3.1",
            "buildenv-v0.3.1",
            "v0.3.0",
            "buildenv-v0.3.0",
            "v0.2.2",
            "buildenv-v0.2.2",
            "v0.2.1",
            "buildenv-v0.2.1",
            "v0.2.0",
            "buildenv-v0.2.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-8905.json",
            "vanir_signatures": [
              {
                "id": "CVE-2020-8905-6c5c34f2",
                "digest": {
                  "threshold": 0.9,
                  "line_hashes": [
                    "206843566668820650509670967168184456061",
                    "80156147239961341313323500740088832576",
                    "199487815859305689901389025254287933562",
                    "164706716403506214144524274119973725632"
                  ]
                },
                "source": "https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93",
                "target": {
                  "file": "asylo/platform/host_call/trusted/host_calls.cc"
                },
                "deprecated": false,
                "signature_type": "Line",
                "signature_version": "v1"
              },
              {
                "id": "CVE-2020-8905-da74cbf8",
                "digest": {
                  "length": 1020,
                  "function_hash": "14747568182961413266336135363801043561"
                },
                "source": "https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93",
                "target": {
                  "file": "asylo/platform/host_call/trusted/host_calls.cc",
                  "function": "enc_untrusted_recvfrom"
                },
                "deprecated": false,
                "signature_type": "Function",
                "signature_version": "v1"
              }
            ],
            "vanir_signatures_modified": "2026-10-20T14:14:05Z"
          }
        }
      ],
      "modified": "2026-10-20T14:14:05.767078230Z",
      "provider": "osv",
      "references": [
        "https://github.com/google/asylo/commit/299f804acbb95a612ab7c504d25ab908aa59ae93"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2020-8905",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 388739,
  "published_at": "2020-08-12T19:15:14.67+00:00"
}