CVE-2020-12392: The 'Copy as cURL' feature of Devtools' network tab did not properly escape the HTTP POST data of a request, which can be controlled by the…

Versions reported by the vendor

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

• Mozilla Firefox

  • unspecified and later · before 76affected

• Mozilla Firefox ESR

  • unspecified and later · before 68.8affected

• Mozilla Thunderbird

  • unspecified and later · before 68.8.0affected

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-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x…KEV
  94Now
• CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
  87Now
• CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to…KEV
  86Now

Published before and after this one in the same product

• ← EarlierCVE-2020-12390May 26, 2020 · Incorrect origin serialization of URLs with IPv6 addresses could lead to incorrect security checks.
  39Monitor
• ← EarlierCVE-2020-12391May 26, 2020 · Documents formed using data: URLs in an OBJECT element failed to inherit the CSP of the creating context.
  30Monitor
• Later →CVE-2020-6831May 26, 2020 · A buffer overflow could occur when parsing and validating SCTP chunks in WebRTC.
  41Plan

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.