CVE-2023-42669: Samba: "rpcecho" development server allows denial of service via sleep() call on ad dc

Affected versions

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

• redhat enterprise linux8.0
• redhat enterprise linux9.0
• redhat enterprise linux eus9.0
• redhat enterprise linux for ibm z systems9.0_s390x
• redhat enterprise linux for ibm z systems eus9.0_s390x
• redhat enterprise linux for power little endian9.0_ppc64le
• redhat enterprise linux for power little endian eus9.0_ppc64le
• redhat storage3.0
• samba samba4.19.0 and later · before 4.19.1
• samba samba4.18.0 and later · before 4.18.8
• samba samba4.0.0 and later · before 4.17.12

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
  • 4.0.0 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

  • 0:4.18.6-2.el8_9 and laternot affected · rpm
  • 0:4.18.6-2.el8_9 and laternot affected · rpm

• Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support

  • 0:4.15.5-13.el8_6 and laternot affected · rpm

• Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support

  • 0:4.17.5-4.el8_8 and laternot affected · rpm

• Red Hat Red Hat Enterprise Linux 9

  • 0:4.18.6-101.el9_3 and laternot affected · rpm
  • 0:4.18.6-101.el9_3 and laternot affected · rpm

• Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support

  • 0:4.15.5-111.el9_0 and laternot affected · rpm

• Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support

  • 0:4.17.5-104.el9_2 and laternot affected · rpm

• Red Hat Red Hat Storage 3

  • all versionsunknown

• Red Hat Red Hat Virtualization 4 for Red Hat Enterprise Linux 8

  • 0:4.15.5-13.el8_6 and laternot affected · rpm

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-2023-4091Nov 3, 2023 · Samba: smb clients can truncate files with read-only permissions
  26Monitor
• ← EarlierCVE-2023-3961Nov 3, 2023 · Samba: smbd allows client access to unix domain sockets on the file system as root
  40Plan
• Later →CVE-2023-4154Nov 7, 2023 · Samba: ad dc password exposure to privileged users and rodcs
  26Monitor

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.