DEBIAN-CVE-2021-43523

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    DEBIAN-CVE-2021-43523

    Published: 10 Nov 2021Last Modified: 1 Sept 2026
    Upstream:
    CVE-2021-43523

    Summary:

    Details: In uClibc and uClibc-ng before 1.0.39, incorrect handling of special characters in domain names returned by DNS servers via gethostbyname, getaddrinfo, gethostbyaddr, and getnameinfo can lead to output of wrong hostnames (leading to domain hijacking) or injection into applications (leading to remote code execution, XSS, applications crashes, etc.). In other words, a validation step, which is expected in any stub resolver, does not occur.

    References: https://security-tracker.debian.org/tracker/CVE-2021-43523

    Affected packages

    Package

    Name: uclibc

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected versions

    1.0.35-1
    1.0.54-1

    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-2021-43523 | CVE-DB