libxml2 various overflows

Multiple buffer overflows in libXML 2.6.12 and 2.6.13 (libxml2), and possibly other versions, may allow remote attackers to execute arbitrary code via (1) a long FTP URL that is not properly handled by the xmlNanoFTPScanURL function, (2) a long proxy URL containing FTP data that is not properly handled by the xmlNanoFTPScanProxy function, and other overflows related to manipulation of DNS length values, including (3) xmlNanoFTPConnect, (4) xmlNanoHTTPConnectHost, and (5) xmlNanoHTTPConnectHost.

Multiple buffer overflows in XMLStarlet Command Line XML Toolkit 0.9.3 have unknown impact and attack vectors via (1) xml_elem.c and (2) xml_select.c.

Format string vulnerability in xml_elem.c for XMLStarlet Command Line XML Toolkit 0.9.3 may allow attackers to cause a denial of service or execute arbitrary code.