Software Update in Apple Mac OS X 10.5.1 allows remote attackers to execute arbitrary commands via a man-in-the-middle (MITM) attack between the client and the server, using a modified distribution definition file with the “allow-external-scripts” option.
docs.info.apple.com/article.html?artnum=307179
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secunia.com/advisories/28136
securitytracker.com/id?1019106
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exchange.xforce.ibmcloud.com/vulnerabilities/39111