GSD-2021-37632

Vulnerability from gsd - Updated: 2023-12-13 01:23
Details
SuperMartijn642's Config Lib is a library used by a number of mods for the game Minecraft. The versions of SuperMartijn642's Config Lib between 1.0.4 and 1.0.8 are affected by a vulnerability and can be exploited on both servers and clients. Using SuperMartijn642's Config Lib, servers will send a packet to clients with the server's config values. In order to read `enum` values from the packet data, `ObjectInputStream#readObject` is used. `ObjectInputStream#readObject` will instantiate a class based on the input data. Since, the packet data is not validated before `ObjectInputStream#readObject` is called, an attacker can instantiate any class by sending a malicious packet. If a suitable class is found, the vulnerability can lead to a number of exploits, including remote code execution. Although the vulnerable packet is typically only send from server to client, it can theoretically also be send from client to server. This means both clients and servers running SuperMartijn642's Config Lib between 1.0.4 and 1.0.8 are vulnerable. The vulnerability has been patched in SuperMartijn642's Config lib 1.0.9. Both, players and server owners, should update to 1.0.9 or higher.
Aliases
Aliases
CVE-2021-37632
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{
  "GSD": {
    "alias": "CVE-2021-37632",
    "description": "SuperMartijn642\u0027s Config Lib is a library used by a number of mods for the game Minecraft. The versions of SuperMartijn642\u0027s Config Lib between 1.0.4 and 1.0.8 are affected by a vulnerability and can be exploited on both servers and clients. Using SuperMartijn642\u0027s Config Lib, servers will send a packet to clients with the server\u0027s config values. In order to read `enum` values from the packet data, `ObjectInputStream#readObject` is used. `ObjectInputStream#readObject` will instantiate a class based on the input data. Since, the packet data is not validated before `ObjectInputStream#readObject` is called, an attacker can instantiate any class by sending a malicious packet. If a suitable class is found, the vulnerability can lead to a number of exploits, including remote code execution. Although the vulnerable packet is typically only send from server to client, it can theoretically also be send from client to server. This means both clients and servers running SuperMartijn642\u0027s Config Lib between 1.0.4 and 1.0.8 are vulnerable. The vulnerability has been patched in SuperMartijn642\u0027s Config lib 1.0.9. Both, players and server owners, should update to 1.0.9 or higher.",
    "id": "GSD-2021-37632"
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-37632"
      ],
      "details": "SuperMartijn642\u0027s Config Lib is a library used by a number of mods for the game Minecraft. The versions of SuperMartijn642\u0027s Config Lib between 1.0.4 and 1.0.8 are affected by a vulnerability and can be exploited on both servers and clients. Using SuperMartijn642\u0027s Config Lib, servers will send a packet to clients with the server\u0027s config values. In order to read `enum` values from the packet data, `ObjectInputStream#readObject` is used. `ObjectInputStream#readObject` will instantiate a class based on the input data. Since, the packet data is not validated before `ObjectInputStream#readObject` is called, an attacker can instantiate any class by sending a malicious packet. If a suitable class is found, the vulnerability can lead to a number of exploits, including remote code execution. Although the vulnerable packet is typically only send from server to client, it can theoretically also be send from client to server. This means both clients and servers running SuperMartijn642\u0027s Config Lib between 1.0.4 and 1.0.8 are vulnerable. The vulnerability has been patched in SuperMartijn642\u0027s Config lib 1.0.9. Both, players and server owners, should update to 1.0.9 or higher.",
      "id": "GSD-2021-37632",
      "modified": "2023-12-13T01:23:10.003275Z",
      "schema_version": "1.4.0"
    }
  },
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        "ID": "CVE-2021-37632",
        "STATE": "PUBLIC",
        "TITLE": "Deserialization of Untrusted Data in com.supermartijn642.configlib.ConfigSyncPacket"
      },
      "affects": {
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            {
              "product": {
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                    "version": {
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                          "version_value": "\u003e= 1.0.4, \u003c 1.0.8"
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          }
        ]
      },
      "impact": {
        "cvss": {
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          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
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        "advisory": "GHSA-f4r5-w453-2jx6",
        "discovery": "UNKNOWN"
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    },
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                "versionStartIncluding": "1.0.4",
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            }
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              "tags": [
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      "impact": {
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          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
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            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
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          "impactScore": 6.4,
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          "obtainOtherPrivilege": false,
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          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2021-08-17T15:00Z",
      "publishedDate": "2021-08-05T21:15Z"
    }
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.