Large RSA keys can cause high CPU usage in crypto/tls

Affected versions

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

• golang gobefore 1.19.12
• golang go1.20.0 and later · before 1.20.7
• golang go1.21.0

Versions reported by the vendor

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

• Go standard library crypto/tls

  • before 1.19.12affected · semver
  • 1.20.0-0 and later · before 1.20.7affected · semver
  • 1.21.0-0 and later · before 1.21.0-rc.4affected · semver

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-2018-7187The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used, does not validate the import path (get/vcs.go only
  54Plan
• CVE-2018-16873In Go before 1.10.6 and 1.11.x before 1.11.3, the "go get" command is vulnerable to remote code execution when executed with the -u flag and
  52Plan
• CVE-2021-38297Go before 1.16.9 and 1.17.x before 1.17.2 has a Buffer Overflow via large arguments in a function invocation from a WASM module, when GOARCH
  42Plan

Published before and after this one in the same product

• ← EarlierCVE-2023-29405Jun 8, 2023 · Improper sanitization of LDFLAGS with embedded spaces in go command with cgo in cmd/go
  40Plan
• ← EarlierCVE-2023-29406Jul 11, 2023 · Insufficient sanitization of Host header in net/http
  26Monitor
• Later →CVE-2023-39318Sep 8, 2023 · Improper handling of HTML-like comments in script contexts in html/template
  24Monitor

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.