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The get_referers function in /opt/ws/bin/sblistpack in Sophos Web Appliance before 3.7.9.1 and 3.8 before 3.8.1.1 allows remote attackers to execute arbitrary commands via shell metacharacters in the domain parameter to end-user/index.php.
Use CWE-78, Sophos vendor hub and Web Appliance Firmware product page to widen CVE-2013-4983 into its surrounding weakness, vendor, and product context.
Compare it with CVE-2013-2642, CVE-2014-2850 and CVE-2014-2849 for nearby disclosures in the same product family.