Samba: ad dc busy rpc multiple listener dos

Affected versions

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

• fedoraproject fedora39
• samba sambabefore 4.17.12
• samba samba4.18.0 and later · before 4.18.8
• samba samba4.19.0 and later · before 4.19.1

Versions reported by the vendor

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

• github.com/samba-team/samba samba

  • 4.19.0affected
  • 4.16.0 and later · before 4.17.12affected · semver
  • 4.18.0 and later · before 4.18.8affected · semver

• Red Hat Red Hat Enterprise Linux 6

  • all versionsunknown
  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 7

  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 8

  • all versionsunknown

• Red Hat Red Hat Enterprise Linux 9

  • all versionsunknown

• Red Hat Red Hat Storage 3

  • all versionsunknown

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-2017-7494Samba since version 3.5.0 and before 4.6.4, 4.5.10 and 4.4.14 is vulnerable to remote code execution vulnerability, allowing a malicious cliKEV
  99Now
• CVE-2015-0240The Netlogon server implementation in smbd in Samba 3.5.x and 3.6.x before 3.6.25, 4.0.x before 4.0.25, 4.1.x before 4.1.17, and 4.2.x befor
  66This week
• CVE-2003-0085Buffer overflow in the SMB/CIFS packet fragment re-assembly code for SMB daemon (smbd) in Samba before 2.2.8, and Samba-TNG before 0.3.1, al
  66This week

Published before and after this one in the same product

• ← EarlierCVE-2023-3347Jul 20, 2023 · Samba: smb2 packet signing is not enforced when "server signing = required" is set
  23Monitor
• ← EarlierCVE-2023-5568Oct 25, 2023 · Samba: heap buffer overflow with freshness tokens in the heimdal kdc
  27Monitor
• Later →CVE-2023-4091Nov 3, 2023 · Samba: smb clients can truncate files with read-only permissions
  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.