Vulnerability-Lookup

CNVD-2018-21509

Vulnerability from cnvd - Published: 2018-10-23

Title

kaptcha访问绕过漏洞

Description

kaptcha是一款基于SimpleCaptcha的验证码生成工具。 kaptcha 2.3.2版本中的多个文件存在安全漏洞，该漏洞源于程序使用‘Random’函数（而不是‘SecureRandom’函数）创建CAPTCHA值。远程攻击者可借助暴力破解的方法利用该漏洞绕过访问限制。（多个文件包括：text/impl/DefaultTextCreator.java、text/impl/ChineseTextProducer.java和text/impl/FiveLetterFirstNameTextCreator.java）

Severity

高

Formal description

目前厂商暂未发布修复措施解决此安全问题，建议使用此软件的用户随时关注厂商主页或参考网址以获取解决办法： https://code.google.com/archive/p/kaptcha/

Reference

https://vuldb.com/?id.125827

Impacted products

Name
kaptcha kaptcha 2.3.2

Show details on source website

JSON

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{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2018-18531"
    }
  },
  "description": "kaptcha\u662f\u4e00\u6b3e\u57fa\u4e8eSimpleCaptcha\u7684\u9a8c\u8bc1\u7801\u751f\u6210\u5de5\u5177\u3002\r\n\r\nkaptcha 2.3.2\u7248\u672c\u4e2d\u7684\u591a\u4e2a\u6587\u4ef6\u5b58\u5728\u5b89\u5168\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7a0b\u5e8f\u4f7f\u7528\u2018Random\u2019\u51fd\u6570\uff08\u800c\u4e0d\u662f\u2018SecureRandom\u2019\u51fd\u6570\uff09\u521b\u5efaCAPTCHA\u503c\u3002\u8fdc\u7a0b\u653b\u51fb\u8005\u53ef\u501f\u52a9\u66b4\u529b\u7834\u89e3\u7684\u65b9\u6cd5\u5229\u7528\u8be5\u6f0f\u6d1e\u7ed5\u8fc7\u8bbf\u95ee\u9650\u5236\u3002\uff08\u591a\u4e2a\u6587\u4ef6\u5305\u62ec\uff1atext/impl/DefaultTextCreator.java\u3001text/impl/ChineseTextProducer.java\u548ctext/impl/FiveLetterFirstNameTextCreator.java\uff09",
  "discovererName": "unknown",
  "formalWay": "\u76ee\u524d\u5382\u5546\u6682\u672a\u53d1\u5e03\u4fee\u590d\u63aa\u65bd\u89e3\u51b3\u6b64\u5b89\u5168\u95ee\u9898\uff0c\u5efa\u8bae\u4f7f\u7528\u6b64\u8f6f\u4ef6\u7684\u7528\u6237\u968f\u65f6\u5173\u6ce8\u5382\u5546\u4e3b\u9875\u6216\u53c2\u8003\u7f51\u5740\u4ee5\u83b7\u53d6\u89e3\u51b3\u529e\u6cd5\uff1a\r\nhttps://code.google.com/archive/p/kaptcha/",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2018-21509",
  "openTime": "2018-10-23",
  "products": {
    "product": "kaptcha kaptcha 2.3.2"
  },
  "referenceLink": "https://vuldb.com/?id.125827",
  "serverity": "\u9ad8",
  "submitTime": "2018-10-23",
  "title": "kaptcha\u8bbf\u95ee\u7ed5\u8fc7\u6f0f\u6d1e"
}

CVE-2018-18531 (GCVE-0-2018-18531)

Vulnerability from cvelistv5 – Published: 2018-10-19 20:00 – Updated: 2024-09-17 04:10

Summary

text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random (rather than SecureRandom) function for generating CAPTCHA values, which makes it easier for remote attackers to bypass intended access restrictions via a brute-force approach.

Severity ?

No CVSS data available.

CWE

Assigner

mitre

References

URL

Tags

https://github.com/penggle/kaptcha/issues/3

x_refsource_MISC

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-05T11:15:59.853Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/penggle/kaptcha/issues/3"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "n/a",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "n/a"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random (rather than SecureRandom) function for generating CAPTCHA values, which makes it easier for remote attackers to bypass intended access restrictions via a brute-force approach."
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "description": "n/a",
              "lang": "en",
              "type": "text"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2018-10-19T20:00:00Z",
        "orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
        "shortName": "mitre"
      },
      "references": [
        {
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/penggle/kaptcha/issues/3"
        }
      ],
      "x_legacyV4Record": {
        "CVE_data_meta": {
          "ASSIGNER": "cve@mitre.org",
          "ID": "CVE-2018-18531",
          "STATE": "PUBLIC"
        },
        "affects": {
          "vendor": {
            "vendor_data": [
              {
                "product": {
                  "product_data": [
                    {
                      "product_name": "n/a",
                      "version": {
                        "version_data": [
                          {
                            "version_value": "n/a"
                          }
                        ]
                      }
                    }
                  ]
                },
                "vendor_name": "n/a"
              }
            ]
          }
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "eng",
              "value": "text/impl/DefaultTextCreator.java, text/impl/ChineseTextProducer.java, and text/impl/FiveLetterFirstNameTextCreator.java in kaptcha 2.3.2 use the Random (rather than SecureRandom) function for generating CAPTCHA values, which makes it easier for remote attackers to bypass intended access restrictions via a brute-force approach."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "n/a"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/penggle/kaptcha/issues/3",
              "refsource": "MISC",
              "url": "https://github.com/penggle/kaptcha/issues/3"
            }
          ]
        }
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca",
    "assignerShortName": "mitre",
    "cveId": "CVE-2018-18531",
    "datePublished": "2018-10-19T20:00:00Z",
    "dateReserved": "2018-10-19T00:00:00Z",
    "dateUpdated": "2024-09-17T04:10:30.464Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}

Sightings

Author	Source	Type	Date

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.

Action not permitted

CNVD-2018-21509

CVE-2018-18531 (GCVE-0-2018-18531)

Tags

Sightings

Nomenclature