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CVE-2013-2061

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-2368-1
Posted Oct 2, 2014
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 2368-1 - It was discovered that OpenVPN incorrectly handled HMAC comparisons when running in UDP mode. If a remote attacker were able to perform a man-in-the-middle attack, this flaw could possibly be used to perform a plaintext recovery attack.

tags | advisory, remote, udp
systems | linux, ubuntu
advisories | CVE-2013-2061
MD5 | 5c4a720e31a6e269ecb95073fcebb84f
Gentoo Linux Security Advisory 201311-13
Posted Nov 20, 2013
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201311-13 - Multiple vulnerabilities have been found in OpenVPN, allowing remote attackers to read encrypted traffic. Versions less than 2.3.1 are affected.

tags | advisory, remote, vulnerability
systems | linux, gentoo
advisories | CVE-2009-3555, CVE-2013-2061
MD5 | f38fb8808d00cf822a08da7d7af2cc2d
Mandriva Linux Security Advisory 2013-167
Posted May 28, 2013
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2013-167 - OpenVPN 2.3.0 and earlier running in UDP mode are subject to chosen ciphertext injection due to a non-constant-time HMAC comparison function. Plaintext recovery may be possible using a padding oracle attack on the CBC mode cipher implementation of the crypto library, optimistically at a rate of about one character per 3 hours. PolarSSL seems vulnerable to such an attack; the vulnerability of OpenSSL has not been verified or tested.

tags | advisory, udp, crypto
systems | linux, mandriva
advisories | CVE-2013-2061
MD5 | e4c96f81d7bca3fd718fb6c1f4d13cdc
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