RubyGems version 2.6.12 and earlier fails to validate specification names, allowing a maliciously crafted gem to potentially overwrite any f

Affected versions

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

• canonical ubuntu linux14.04
• canonical ubuntu linux16.04
• canonical ubuntu linux17.10
• debian debian linux8.0
• debian debian linux9.0
• redhat enterprise linux desktop7.0
• redhat enterprise linux server7.0
• redhat enterprise linux server aus7.4
• redhat enterprise linux server aus7.6
• redhat enterprise linux server eus7.4
• redhat enterprise linux server eus7.5
• redhat enterprise linux server eus7.6
• redhat enterprise linux server tus7.4
• redhat enterprise linux server tus7.6
• redhat enterprise linux workstation7.0
• rubygems rubygemsup to 2.6.12 inclusive

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.

• HackerOne RubyGems

  • Versions before 2.6.13affected

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-2017-0903RubyGems versions between 2.0.0 and 2.6.13 are vulnerable to a possible remote code execution vulnerability.
  44Plan
• CVE-2017-0899RubyGems version 2.6.12 and earlier is vulnerable to maliciously crafted gem specifications that include terminal escape characters.
  42Plan
• CVE-2018-1000076RubyGems version Ruby 2.2 series: 2.2.9 and earlier, Ruby 2.3 series: 2.3.6 and earlier, Ruby 2.4 series: 2.4.3 and earlier, Ruby 2.5 series
  40Plan
• CVE-2019-8324An issue was discovered in RubyGems 2.6 and later through 3.0.2.
  36Monitor
• CVE-2022-36073RubyGems allows creation of users with arbitrary unverified emails
  35Monitor
• CVE-2017-0902RubyGems version 2.6.12 and earlier is vulnerable to a DNS hijacking vulnerability that allows a MITM attacker to force the RubyGems client
  33Monitor

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.