DEBIAN-CVE-2023-29383

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    DEBIAN-CVE-2023-29383

    Published: 14 Apr 2023Last Modified: 15 Sept 2026
    Upstream:
    CVE-2023-29383

    Summary:

    Details: In Shadow 4.13, it is possible to inject control characters into fields provided to the SUID program chfn (change finger). Although it is not possible to exploit this directly (e.g., adding a new user fails because \n is in the block list), it is possible to misrepresent the /etc/passwd file when viewed. Use of \r manipulations and Unicode characters to work around blocking of the : character make it possible to give the impression that a new user has been added. In other words, an adversary may be able to convince a system administrator to take the system offline (an indirect, social-engineered denial of service) by demonstrating that "cat /etc/passwd" shows a rogue user account.

    References: https://security-tracker.debian.org/tracker/CVE-2023-29383

    Affected packages

    Package

    Name: shadow

    Purl: pkg:deb/debian/shadow?arch=source&distro=bookworm

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:4.13+dfsg1-1+deb12u1

    Affected versions

    1:4.13+dfsg1-1

    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
    DEBIAN-CVE-2023-29383 | CVE-DB