CVE-2022-40897

Python Packaging Authority (PyPA) setuptools before 65.5.1 allows remote attackers to cause a denial of service via HTML in a crafted package or custom PackageIndex page. There is a Regular Expression Denial of Service (ReDoS) in package_index.py.

Weakness

The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles.

Affected Software

Extended Description

      Attackers can create crafted inputs that
      intentionally cause the regular expression to use
      excessive backtracking in a way that causes the CPU
      consumption to spike.

Potential Mitigations

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/492.html

References

• https://github.com/pypa/setuptools/blob/fe8a98e696241487ba6ac9f91faa38ade939ec5d/setuptools/package_index.py#L200
• https://github.com/pypa/setuptools/commit/43a9c9bfa6aa626ec2a22540bea28d2ca77964be
• https://github.com/pypa/setuptools/compare/v65.5.0...v65.5.1
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ADES3NLOE5QJKBLGNZNI2RGVOSQXA37R/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YNA2BAH2ACBZ4TVJZKFLCR7L23BG5C3H/
• https://pyup.io/posts/pyup-discovers-redos-vulnerabilities-in-top-python-packages/
• https://pyup.io/vulnerabilities/CVE-2022-40897/52495/
• https://security.netapp.com/advisory/ntap-20230214-0001/