rack/file.rb (Rack::File) in Rack 1.5.x before 1.5.2 and 1.4.x before 1.4.5 allows attackers to access arbitrary files outside the intended

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

• rack project rack1.4.0
• rack project rack1.4.1
• rack project rack1.4.2
• rack project rack1.4.3
• rack project rack1.4.4
• rack project rack1.5.0
• rack project rack1.5.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Other highest-scoring records for the same primary product.

• CVE-2022-30123A sequence injection vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 which could allow is a possible shell escape in the Lint a
  41Plan
• CVE-2020-8161A directory traversal vulnerability exists in rack < 2.2.0 that allows an attacker perform directory traversal vulnerability in the Rack::Di
  35Monitor
• CVE-2022-30122A possible denial of service vulnerability exists in Rack <2.0.9.1, <2.1.4.1 and <2.2.3.1 in the multipart parsing component of Rack.
  31Monitor
• CVE-2020-8184A reliance on cookies without validation/integrity check security vulnerability exists in rack < 2.2.3, rack < 2.1.4 that makes it is possib
  31Monitor
• CVE-2018-16470There is a possible DoS vulnerability in the multipart parser in Rack before 2.0.6.
  31Monitor
• CVE-2018-16471There is a possible XSS vulnerability in Rack before 2.0.6 and 1.6.11.
  25Monitor

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

1const file = path.join(ROOT, req.query.name);2res.sendFile(file);

1const file = path.resolve(ROOT, req.query.name);2if (!file.startsWith(ROOT + path.sep)) {3  return res.sendStatus(400);4}5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.