The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier, when running in UPD mode, allows remote attackers to obtain sensitive information via a timing attack involving an HMAC comparison function that does not run in constant time and a padding oracle attack on the CBC mode cipher. http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-2061
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