pysec - pysec-2021-333

PYSEC-2021-333

Vulnerability from pysec - Published: 2021-09-20 17:15 - Updated: 2023-04-09 10:46

Details

sqlparse is a non-validating SQL parser module for Python. In sqlparse versions 0.4.0 and 0.4.1 there is a regular Expression Denial of Service in sqlparse vulnerability. The regular expression may cause exponential backtracking on strings containing many repetitions of '\r\n' in SQL comments. Only the formatting feature that removes comments from SQL statements is affected by this regular expression. As a workaround don't use the sqlformat.format function with keyword strip_comments=True or the --strip-comments command line flag when using the sqlformat command line tool. The issues has been fixed in sqlparse 0.4.2.

Impacted products

Name	purl
sqlparse	pkg:pypi/sqlparse

Aliases

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sqlparse",
        "purl": "pkg:pypi/sqlparse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1499cffcd7c4d635b4297b44d48fb4fe94cf988e"
            },
            {
              "fixed": "8238a9e450ed1524e40cb3a8b0b3c00606903aeb"
            }
          ],
          "repo": "https://github.com/andialbrecht/sqlparse",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0.4.0"
            },
            {
              "fixed": "0.4.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.4.0",
        "0.4.1"
      ]
    }
  ],
  "aliases": [
    "CVE-2021-32839",
    "GHSA-p5w8-wqhj-9hhf"
  ],
  "details": "sqlparse is a non-validating SQL parser module for Python. In sqlparse versions 0.4.0 and 0.4.1 there is a regular Expression Denial of Service in sqlparse vulnerability. The regular expression may cause exponential backtracking on strings containing many repetitions of \u0027\\r\\n\u0027 in SQL comments. Only the formatting feature that removes comments from SQL statements is affected by this regular expression. As a workaround don\u0027t use the sqlformat.format function with keyword strip_comments=True or the --strip-comments command line flag when using the sqlformat command line tool. The issues has been fixed in sqlparse 0.4.2.",
  "id": "PYSEC-2021-333",
  "modified": "2023-04-09T10:46:38.256842Z",
  "published": "2021-09-20T17:15:00Z",
  "references": [
    {
      "type": "FIX",
      "url": "https://github.com/andialbrecht/sqlparse/commit/8238a9e450ed1524e40cb3a8b0b3c00606903aeb"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-p5w8-wqhj-9hhf"
    }
  ]
}

GHSA-P5W8-WQHJ-9HHF

Vulnerability from github – Published: 2021-09-10 17:56 – Updated: 2025-11-04 16:35

Summary

StripComments filter contains a regular expression that is vulnerable to ReDOS (Regular Expression Denial of Service)

Details

Impact

The formatter function that strips comments from a SQL contains a regular expression that is vulnerable to ReDoS (Regular Expression Denial of Service). The regular expression may cause exponential backtracking on strings containing many repetitions of '\r\n' in SQL comments.

Patches

The issues has been fixed in sqlparse 0.4.2.

Workarounds

Only the formatting feature that removes comments from SQL statements is affected by this regular expression. As a workaround don't use the sqlformat.format function with keyword strip_comments=True or the --strip-comments command line flag when using the sqlformat command line tool.

References

This issue was discovered by GitHub team members @erik-krogh and @yoff. It was found using a CodeQL query which identifies inefficient regular expressions. You can see the results of the query on python-sqlparse by following this link.

For more information

If you have any questions or comments about this advisory: * Open an issue in sqlparse issue tracker * Email us at albrecht.andi@gmail.com

Severity ?

7.5 (High)


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

8.7 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "sqlparse"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.4.0"
            },
            {
              "fixed": "0.4.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2021-32839"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-400"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2021-09-10T17:13:29Z",
    "nvd_published_at": "2021-09-20T17:15:00Z",
    "severity": "HIGH"
  },
  "details": "### Impact\nThe formatter function that strips comments from a SQL contains a regular expression that is vulnerable to [ReDoS](https://owasp.org/www-community/attacks/Regular_expression_Denial_of_Service_-_ReDoS) (Regular Expression Denial of Service). The regular expression may cause exponential backtracking on strings containing many repetitions of \u0027\\r\\n\u0027 in SQL comments.\n\n### Patches\nThe issues has been fixed in sqlparse 0.4.2.\n\n### Workarounds\nOnly the formatting feature that removes comments from SQL statements is affected by this regular expression. As a workaround don\u0027t use the `sqlformat.format` function with keyword `strip_comments=True` or the `--strip-comments` command line flag when using the `sqlformat` command line tool.\n\n### References\nThis issue was discovered by GitHub team members @erik-krogh and @yoff. It was found using a [CodeQL](https://codeql.github.com/) query which identifies inefficient regular expressions. You can see the results of the query on python-sqlparse by following [this link](https://lgtm.com/query/2223658096471222354/). \n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [sqlparse issue tracker](https://github.com/andialbrecht/sqlparse/issues)\n* Email us at [albrecht.andi@gmail.com](mailto:albrecht.andi@gmail.com)",
  "id": "GHSA-p5w8-wqhj-9hhf",
  "modified": "2025-11-04T16:35:21Z",
  "published": "2021-09-10T17:56:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-p5w8-wqhj-9hhf"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-32839"
    },
    {
      "type": "WEB",
      "url": "https://github.com/andialbrecht/sqlparse/commit/8238a9e450ed1524e40cb3a8b0b3c00606903aeb"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/andialbrecht/sqlparse"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/sqlparse/PYSEC-2021-333.yaml"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/12/msg00022.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://securitylab.github.com/advisories/GHSL-2021-107-andialbrecht-sqlparse"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "StripComments filter contains a regular expression that is vulnerable to ReDOS (Regular Expression Denial of Service)"
}

CVE-2021-32839 (GCVE-0-2021-32839)

Vulnerability from cvelistv5 – Published: 2021-09-20 17:10 – Updated: 2025-11-03 21:44

Summary

Severity ?

7.5 (High)


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

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M

References

URL

Tags

	https://github.com/andialbrecht/sqlparse/security…	x_refsource_CONFIRM
	https://github.com/andialbrecht/sqlparse/commit/8…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	andialbrecht	sqlparse	Affected: >= 0.4.0, < 0.4.2

Show details on NVD website

JSON

To clipboard

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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

PYSEC-2021-333

GHSA-P5W8-WQHJ-9HHF

Impact

Patches

Workarounds

References

For more information

CVE-2021-32839 (GCVE-0-2021-32839)

Tags

Sightings

Nomenclature