CVE-2011-4415

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    CVE-2011-4415

    Published: 8 Nov 2011Last Modified: 10 Apr 2026

    Summary:

    Details: The ap_pregsub function in server/util.c in the Apache HTTP Server 2.0.x through 2.0.64 and 2.2.x through 2.2.21, when the mod_setenvif module is enabled, does not restrict the size of values of environment variables, which allows local users to cause a denial of service (memory consumption or NULL pointer dereference) via a .htaccess file with a crafted SetEnvIf directive, in conjunction with a crafted HTTP request header, related to (1) the "len +=" statement and (2) the apr_pcalloc function call, a different vulnerability than CVE-2011-3607.

    References: http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/, http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/DemoExploit.html, http://www.halfdog.net/Security/2011/ApacheModSetEnvIfIntegerOverflow/, http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c03360041, http://www.gossamer-threads.com/lists/apache/dev/403775

    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