Integer overflow in kbdint.c in mod_sftp in ProFTPD 1.3.4d and 1.3.5r3 allows remote attackers to cause a denial of service (memory consumption) via a large response count value in an authentication request, which triggers a large memory allocation. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4359
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