UBUNTU-CVE-2023-42116

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    UBUNTU-CVE-2023-42116

    Published: 28 Sept 2023Last Modified: 22 Apr 2026
    Upstream:
    CVE-2023-42116
    Aliases:
    USN-6411-1

    Summary:

    Details: Exim SMTP Challenge Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows remote attackers to execute arbitrary code on affected installations of Exim. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of NTLM challenge requests. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. An attacker can leverage this vulnerability to execute code in the context of the service account. . Was ZDI-CAN-17515.

    References: https://ubuntu.com/security/CVE-2023-42116, https://www.zerodayinitiative.com/advisories/ZDI-23-1470/, https://www.openwall.com/lists/oss-security/2023/10/02/3, https://ubuntu.com/security/notices/USN-6411-1, https://www.cve.org/CVERecord?id=CVE-2023-42116

    Affected packages

    Package

    Name: exim4

    Purl: pkg:deb/ubuntu/[email protected]+esm6?arch=source&distro=trusty/esm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.82-3ubuntu2.4+esm6

    Affected versions

    4.80-7ubuntu3

    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
    UBUNTU-CVE-2023-42116 | CVE-DB