The openvpn_decrypt function in crypto.c in OpenVPN 2.3.0 and earlier,
when running in UDP 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.
Note:References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MLIST:[oss-security] 20130506 Re: CVE request: OpenVPN use of non-constant-time memcmp in HMAC comparison in openvpn_decrypt
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