GHSA-R8WQ-QRXC-HMCM中危已审查

ReDoS in LDAP schema parser

OSV 1.4.0 · github-reviewed · 修改于 2021-11-27 02:26

发布时间

2021-11-30 01:58

GitHub 审查时间

2021-11-27 02:26

NVD 发布时间

—

源文件

advisories/github-reviewed/2021/11/GHSA-r8wq-qrxc-hmcm/GHSA-r8wq-qrxc-hmcm.json

公告说明

https://github.com/python-ldap/python-ldap/issues/424

Impact

The LDAP schema parser of python-ldap 3.3.1 and earlier are vulnerable to a regular expression denial-of-service attack. The issue affects clients that use ldap.schema package to parse LDAP schema definitions from an untrusted source.

Patches

The upcoming release of python-ldap 3.4.0 will contain a workaround to prevent ReDoS attacks. The schema parser refuses schema definitions with an excessive amount of backslashes.

Workarounds

As a workaround, users can check input for excessive amount of backslashes in schemas. More than a dozen backslashes per line are atypical.

References

CWE-1333

For more information

If you have any questions or comments about this advisory:

Open an issue in python-ldap tracker

受影响的软件包

PyPI

标识信息

别名 / CVE

无

CWE

CWE-1333

软件生态

PyPI

扩展资料

暂无扩展资料。

CVSS 评分

CVSS_V3

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

原始 OSV JSON

{
  "id": "GHSA-r8wq-qrxc-hmcm",
  "aliases": [],
  "details": "https://github.com/python-ldap/python-ldap/issues/424\n\n### Impact\nThe LDAP schema parser of python-ldap 3.3.1 and earlier are vulnerable to a regular expression denial-of-service attack. The issue affects clients that use ``ldap.schema`` package to parse LDAP schema definitions from an untrusted source.\n\n### Patches\nThe upcoming release of python-ldap 3.4.0 will contain a workaround to prevent ReDoS attacks. The schema parser refuses schema definitions with an excessive amount of backslashes.\n\n### Workarounds\nAs a workaround, users can check input for excessive amount of backslashes in schemas. More than a dozen backslashes per line are atypical.\n\n### References\n[CWE-1333](https://cwe.mitre.org/data/definitions/1333.html)\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [python-ldap](https://github.com/python-ldap/python-ldap) tracker\n",
  "summary": "ReDoS in LDAP schema parser",
  "affected": [
    {
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.0"
            }
          ]
        }
      ],
      "package": {
        "name": "python-ldap",
        "ecosystem": "PyPI"
      }
    }
  ],
  "modified": "2021-11-26T18:26:27Z",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
  "published": "2021-11-29T17:58:59Z",
  "references": [
    {
      "url": "https://github.com/python-ldap/python-ldap/security/advisories/GHSA-r8wq-qrxc-hmcm",
      "type": "WEB"
    },
    {
      "url": "https://github.com/python-ldap/python-ldap/issues/424",
      "type": "WEB"
    },
    {
      "url": "https://github.com/python-ldap/python-ldap",
      "type": "PACKAGE"
    }
  ],
  "schema_version": "1.4.0",
  "database_specific": {
    "cwe_ids": [
      "CWE-1333"
    ],
    "severity": "MODERATE",
    "github_reviewed": true,
    "nvd_published_at": null,
    "github_reviewed_at": "2021-11-26T18:26:27Z"
  }
}