Publication Date: June 19, 2025 | Last Updated: June 20, 2025
🔒 Overview: High-Risk Samba Flaws Demand Immediate Action
The Samba team has addressed multiple critical vulnerabilities in its widely used SMB/CIFS file-sharing software. These flaws, if exploited, could lead to remote code execution (RCE), privilege escalation, or denial-of-service (DoS) attacks—posing severe risks to enterprises, cloud infrastructure, and Linux/Unix servers.
This advisory covers CVE-2022-3437, CVE-2022-42898, and CVE-2022-45141, detailing their impact, affected Ubuntu versions, and patching instructions. Enterprises relying on Samba for cross-platform file sharing must prioritize updates to mitigate cybersecurity threats.
📌 Detailed Vulnerability Breakdown
1. CVE-2022-3437: GSSAPI Buffer Handling Flaw (DoS Risk)
Discovered by: Evgeny Legerov
Impact: Remote attackers can crash Samba via malformed GSSAPI requests (Heimdal integration).
Severity: High (CVSS: 7.5) – Exploitable over the network without authentication.
2. CVE-2022-42898: PAC Parsing Privilege Escalation (32-bit Systems)
Discovered by: Greg Hudson
Impact: Allows privilege escalation or arbitrary code execution on 32-bit systems.
Affected: Ubuntu 18.04 LTS and earlier.
3. CVE-2022-45141: RC4-HMAC Kerberos Ticket Forcing
Discovered by: Joseph Sutton
Impact: Attackers can force weak RC4 encryption, compromising authentication.
Scope: Ubuntu 20.04 LTS and 22.04 LTS only.
🛠️ How to Patch Samba Vulnerabilities
Standard system updates will apply the fixes. For precise version control:
| Ubuntu Release | Patched Samba Version |
|---|---|
| 18.04 LTS (Bionic) | 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm1 |
| 16.04 LTS (Xenial) | 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm2 |
| 14.04 LTS (Trusty) | 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm13 |
💡 Pro Tip: Ubuntu Pro users receive 10-year extended security maintenance (ESM) for 25,000+ packages. Get Ubuntu Pro free for 5 machines.
🔍 Why These Vulnerabilities Matter for Enterprises
Samba powers millions of servers for seamless Windows-Linux file/print sharing. Exploits targeting these flaws could:
Disrupt critical IT operations via DoS attacks.
Enable lateral movement in corporate networks.
Bypass Kerberos authentication safeguards.
🛡️ Mitigation Strategies:
Apply patches immediately.
Enforce SMB signing and disable deprecated protocols (e.g., SMB1).
Monitor for unusual GSSAPI/PAC-related traffic.
📚 References & Further Reading
Official CVEs: CVE-2022-3437, CVE-2022-42898, CVE-2022-45141
Related USNs: USN-6238-1, USN-5936-1
❓ Frequently Asked Questions (FAQ)
Q: Can these vulnerabilities be exploited remotely?
A: Yes—CVE-2022-3437 and CVE-2022-42898 are remotely exploitable.
Q: Is Ubuntu 23.10 affected?
A: No. Only LTS releases (14.04–22.04) require updates.
Q: How do I verify my Samba version?
A: Run samba --version or check /etc/apt/sources.list.
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