CVE-2018-20679

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    CVE-2018-20679

    Published: 9 Jan 2019Last Modified: 8 Jul 2026

    Summary:

    Details: An issue was discovered in BusyBox before 1.30.0. An out of bounds read in udhcp components (consumed by the DHCP server, client, and relay) allows a remote attacker to leak sensitive information from the stack by sending a crafted DHCP message. This is related to verification in udhcp_get_option() in networking/udhcp/common.c that 4-byte options are indeed 4 bytes.

    References: http://packetstormsecurity.com/files/154361/Cisco-Device-Hardcoded-Credentials-GNU-glibc-BusyBox.html, http://seclists.org/fulldisclosure/2019/Sep/7, https://seclists.org/bugtraq/2019/Sep/7, https://busybox.net/news.html, https://usn.ubuntu.com/3935-1/, https://bugs.busybox.net/show_bug.cgi?id=11506, https://git.busybox.net/busybox/commit/?id=6d3b4bb24da9a07c263f3c1acf8df85382ff562c

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -ef800e5441185585986f9b7aaf39010a926fbd5f

    Affected versions

    1_29_0

    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