gsd-2019-16782
Vulnerability from gsd
Modified
2019-12-18 00:00
Details
There's a possible information leak / session hijack vulnerability in Rack. Attackers may be able to find and hijack sessions by using timing attacks targeting the session id. Session ids are usually stored and indexed in a database that uses some kind of scheme for speeding up lookups of that session id. By carefully measuring the amount of time it takes to look up a session, an attacker may be able to find a valid session id and hijack the session. The session id itself may be generated randomly, but the way the session is indexed by the backing store does not use a secure comparison. Impact: The session id stored in a cookie is the same id that is used when querying the backing session storage engine. Most storage mechanisms (for example a database) use some sort of indexing in order to speed up the lookup of that id. By carefully timing requests and session lookup failures, an attacker may be able to perform a timing attack to determine an existing session id and hijack that session.
Aliases
Aliases
CVE-2019-16782


To clipboard 

{
  "GSD": {
    "alias": "CVE-2019-16782",
    "description": "There\u0027s a possible information leak / session hijack vulnerability in Rack (RubyGem rack). This vulnerability is patched in versions 1.6.12 and 2.0.8. Attackers may be able to find and hijack sessions by using timing attacks targeting the session id. Session ids are usually stored and indexed in a database that uses some kind of scheme for speeding up lookups of that session id. By carefully measuring the amount of time it takes to look up a session, an attacker may be able to find a valid session id and hijack the session. The session id itself may be generated randomly, but the way the session is indexed by the backing store does not use a secure comparison.",
    "id": "GSD-2019-16782",
    "references": [
      "https://www.suse.com/security/cve/CVE-2019-16782.html",
      "https://access.redhat.com/errata/RHSA-2021:1313",
      "https://access.redhat.com/errata/RHSA-2020:4366",
      "https://access.redhat.com/errata/RHSA-2020:2480",
      "https://advisories.mageia.org/CVE-2019-16782.html",
      "https://ubuntu.com/security/CVE-2019-16782"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "affected": [
        {
          "package": {
            "ecosystem": "RubyGems",
            "name": "rack",
            "purl": "pkg:gem/rack"
          }
        }
      ],
      "aliases": [
        "CVE-2019-16782",
        "GHSA-hrqr-hxpp-chr3"
      ],
      "details": "There\u0027s a possible information leak / session hijack vulnerability in Rack.\n\nAttackers may be able to find and hijack sessions by using timing attacks\ntargeting the session id. Session ids are usually stored and indexed in a\ndatabase that uses some kind of scheme for speeding up lookups of that\nsession id. By carefully measuring the amount of time it takes to look up\na session, an attacker may be able to find a valid session id and hijack\nthe session.\n\nThe session id itself may be generated randomly, but the way the session is\nindexed by the backing store does not use a secure comparison.\n\nImpact:\n\nThe session id stored in a cookie is the same id that is used when querying\nthe backing session storage engine.  Most storage mechanisms (for example a\ndatabase) use some sort of indexing in order to speed up the lookup of that\nid.  By carefully timing requests and session lookup failures, an attacker\nmay be able to perform a timing attack to determine an existing session id\nand hijack that session.",
      "id": "GSD-2019-16782",
      "modified": "2019-12-18T00:00:00.000Z",
      "published": "2019-12-18T00:00:00.000Z",
      "references": [
        {
          "type": "WEB",
          "url": "https://github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3"
        }
      ],
      "schema_version": "1.4.0",
      "severity": [
        {
          "score": 6.3,
          "type": "CVSS_V3"
        }
      ],
      "summary": "Possible information leak / session hijack vulnerability"
    }
  },
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      "affects": {
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          "vendor_data": [
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              "product": {
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                    "version": {
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          }
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      },
      "impact": {
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          "availabilityImpact": "NONE",
          "baseScore": 6.3,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
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          "scope": "CHANGED",
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      "source": {
        "advisory": "GHSA-hrqr-hxpp-chr3",
        "discovery": "UNKNOWN"
      }
    },
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      "cve": "2019-16782",
      "cvss_v3": 6.3,
      "date": "2019-12-18",
      "description": "There\u0027s a possible information leak / session hijack vulnerability in Rack.\n\nAttackers may be able to find and hijack sessions by using timing attacks\ntargeting the session id. Session ids are usually stored and indexed in a\ndatabase that uses some kind of scheme for speeding up lookups of that\nsession id. By carefully measuring the amount of time it takes to look up\na session, an attacker may be able to find a valid session id and hijack\nthe session.\n\nThe session id itself may be generated randomly, but the way the session is\nindexed by the backing store does not use a secure comparison.\n\nImpact:\n\nThe session id stored in a cookie is the same id that is used when querying\nthe backing session storage engine.  Most storage mechanisms (for example a\ndatabase) use some sort of indexing in order to speed up the lookup of that\nid.  By carefully timing requests and session lookup failures, an attacker\nmay be able to perform a timing attack to determine an existing session id\nand hijack that session.",
      "gem": "rack",
      "ghsa": "hrqr-hxpp-chr3",
      "patched_versions": [
        "~\u003e 1.6.12",
        "\u003e= 2.0.8"
      ],
      "title": "Possible information leak / session hijack vulnerability",
      "url": "https://github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3"
    },
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        {
          "affected_range": "\u003c1.6.12||\u003e1.6.12 \u003c2.0.8",
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          "cwe_ids": [
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            "CWE-200",
            "CWE-937"
          ],
          "date": "2019-12-28",
          "description": "There\u0027s a possible information leak / session hijack vulnerability in Rack (RubyGem rack). Attackers may be able to find and hijack sessions by using timing attacks targeting the session id. Session ids are usually stored and indexed in a database that uses some kind of scheme for speeding up lookups of that session id. By carefully measuring the amount of time it takes to look up a session, an attacker may be able to find a valid session id and hijack the session. The session id itself may be generated randomly, but the way the session is indexed by the backing store does not use a secure comparison.",
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            "2.0.8"
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            "GHSA-hrqr-hxpp-chr3"
          ],
          "not_impacted": "Version 1.6.12, all versions starting from 2.0.8",
          "package_slug": "gem/rack",
          "pubdate": "2019-12-18",
          "solution": "Upgrade to version 2.0.8 or above.",
          "title": "Information Exposure",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2019-16782",
            "https://github.com/rack/rack/security/advisories/GHSA-hrqr-hxpp-chr3"
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      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "NONE",
            "baseScore": 4.3,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "NONE",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:N/A:N",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "MEDIUM",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 2.2,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2021-11-02T18:04Z",
      "publishedDate": "2019-12-18T20:15Z"
    }
  }
}


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