There is a possible denial of service vulnerability in Action View (Rails) <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 where specially crafted a

Affected versions

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

• debian debian linux8.0
• fedoraproject fedora30
• opensuse leap15.0
• opensuse leap15.1
• redhat cloudforms4.6
• redhat cloudforms4.7
• redhat software collections1.0
• rubyonrails railsbefore 4.2.11.1
• rubyonrails rails5.2.0 and later · before 5.2.2.1
• rubyonrails rails5.1.0 and later · before 5.1.6.2
• rubyonrails rails5.0.0 and later · before 5.0.7.2

Versions reported by the vendor

Affected version ranges reported by the assigning authority (hackerone). Independent of NVD's CPE analysis and usually ahead of it.

• Rails https://github.com/rails/rails

  • 5.2.2.1, 5.1.6.2, 5.0.7.2, 4.2.11.1affected

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-2019-5418There is a File Content Disclosure vulnerability in Action View <5.2.2.1, <5.1.6.2, <5.0.7.2, <4.2.11.1 and v3 where specially crafted accepKEV
  90Now
• CVE-2016-0752Directory traversal vulnerability in Action View in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, anKEV
  89Now
• CVE-2019-5420A remote code execution vulnerability in development mode Rails <5.2.2.1, <6.0.0.beta3 can allow an attacker to guess the automatically gene
  66This week

Published before and after this one in the same product

• ← EarlierCVE-2018-16476Nov 30, 2018 · A Broken Access Control vulnerability in Active Job versions >= 4.2.0 allows an attacker to craft user input which can cause Active Job to d
  31Monitor
• ← EarlierCVE-2018-16477Nov 30, 2018 · A bypass vulnerability in Active Storage >= 5.2.0 for Google Cloud Storage and Disk services allow an attacker to modify the `content-dispos
  26Monitor
• Later →CVE-2010-3299Nov 12, 2019 · The encrypt/decrypt functions in Ruby on Rails 2.3 are vulnerable to padding oracle attacks.
  26Monitor

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

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

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

1function expand(node) {2  return node.children.map(expand);3}

1const MAX_DEPTH = 32;2function expand(node, depth = 0) {3  if (depth > MAX_DEPTH) throw new Error("too deep");4  return node.children.map((c) => expand(c, depth + 1));5}

Attack context

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