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CVE-2021-32839— Regular Expression Denial of Service in sqlparse

Quick assessment

Affected
andialbrecht sqlparse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

sqlparse是 Python 的非验证 SQL 解析器。它提供对 SQL 语句的解析、拆分和格式化的支持。 sqlparse 0.4.0 和 0.4.1 版本中存在资源管理错误漏洞，该漏洞允许攻击者进行ReDoS（正则表达式拒绝服务）的攻击。

CVSS 7.5 · High EPSS 2.30% · P82

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking
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I. Basic Information for CVE-2021-32839

Vulnerability Information
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Vulnerability Title
Regular Expression Denial of Service in sqlparse
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
Source: CVE Program / CVE List V5
Vulnerability Title
sqlparse 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
sqlparse是 Python 的非验证 SQL 解析器。它提供对 SQL 语句的解析、拆分和格式化的支持。 sqlparse 0.4.0 和 0.4.1 版本中存在资源管理错误漏洞，该漏洞允许攻击者进行ReDoS（正则表达式拒绝服务）的攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
andialbrecht sqlparse >= 0.4.0, < 0.4.2 -

II. Public POCs for CVE-2021-32839

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III. Intelligence Information for CVE-2021-32839

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Patches & Fixes for CVE-2021-32839 (1)

Vendor Advisories for CVE-2021-32839 (1)

IV. Related Vulnerabilities

Same product: sqlparse
Same vendor: andialbrecht
Same weakness: CWE-400

V. Comments for CVE-2021-32839

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