UBUNTU-CVE-2023-3347

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    UBUNTU-CVE-2023-3347

    Published: 19 Jul 2023Last Modified: 4 Feb 2026
    Upstream:
    CVE-2023-3347
    Aliases:
    USN-6238-1

    Summary:

    Details: A vulnerability was found in Samba's SMB2 packet signing mechanism. The SMB2 packet signing is not enforced if an admin configured "server signing = required" or for SMB2 connections to Domain Controllers where SMB2 packet signing is mandatory. This flaw allows an attacker to perform attacks, such as a man-in-the-middle attack, by intercepting the network traffic and modifying the SMB2 messages between client and server, affecting the integrity of the data.

    References: https://ubuntu.com/security/CVE-2023-3347, https://www.samba.org/samba/security/CVE-2023-3347.html, https://ubuntu.com/security/notices/USN-6238-1, https://www.cve.org/CVERecord?id=CVE-2023-3347

    Affected packages

    Package

    Name: samba

    Purl: pkg:deb/ubuntu/samba@2:4.15.13+dfsg-0ubuntu0.20.04.2?arch=source&distro=focal

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -2:4.15.13+dfsg-0ubuntu0.20.04.2

    Affected versions

    2:4.10.7+dfsg-0ubuntu2
    2:4.10.7+dfsg-0ubuntu3

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
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