CVE-2011-0520

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    CVE-2011-0520

    Published: 28 Jan 2011Last Modified: 10 Apr 2026

    Summary:

    Details: The compress_add_dlabel_points function in dns/Compress.c in MaraDNS 1.4.03, 1.4.05, and probably other versions allows remote attackers to cause a denial of service (segmentation fault) and possibly execute arbitrary code via a long DNS hostname with a large number of labels, which triggers a heap-based buffer overflow.

    References: http://secunia.com/advisories/43027, http://secunia.com/advisories/43107, http://www.debian.org/security/2011/dsa-2196, http://www.vupen.com/english/advisories/2011/0699, http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=610834, http://osvdb.org/70630, http://www.openwall.com/lists/oss-security/2011/01/24/1, http://www.openwall.com/lists/oss-security/2011/01/24/6, http://www.securityfocus.com/bid/45966, https://exchange.xforce.ibmcloud.com/vulnerabilities/64885

    Affected packages

    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