Vulnerability Details : CVE-2013-2061
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.
Vulnerability category: Information leak
Products affected by CVE-2013-2061
- cpe:2.3:a:openvpn:openvpn:*:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.6.0:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.5.0:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.3.0:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.2.1:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:2.1.0:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.3.2:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.3.1:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.4.3:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.4.2:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:2.2.0:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.4.1:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn:1.4.0:*:*:*:*:*:*:*
- cpe:2.3:a:openvpn:openvpn_access_server:2.0.0:*:*:*:*:*:*:*
- cpe:2.3:o:opensuse:opensuse:11.4:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2013-2061
0.56%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 78 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2013-2061
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
2.6
|
LOW | AV:N/AC:H/Au:N/C:P/I:N/A:N |
4.9
|
2.9
|
NIST |
CWE ids for CVE-2013-2061
-
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.Assigned by: nvd@nist.gov (Primary)
References for CVE-2013-2061
-
https://bugzilla.redhat.com/show_bug.cgi?id=960192
960192 – (CVE-2013-2061) CVE-2013-2061 openvpn: use of non-constant-time memcmp in HMAC comparison in openvpn_decrypt
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https://bugs.gentoo.org/show_bug.cgi?id=468756
468756 – (CVE-2013-2061) <net-misc/openvpn-2.3.1: ciphertext injection vulnerability in UDP mode (CVE-2013-2061)
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http://lists.opensuse.org/opensuse-updates/2013-11/msg00012.html
openSUSE-SU-2013:1645-1: moderate: update for openvpnVendor Advisory
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https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-f375aa67cc
SecurityAnnouncement-f375aa67cc – OpenVPN Community
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http://lists.opensuse.org/opensuse-updates/2013-11/msg00016.html
openSUSE-SU-2013:1649-1: moderate: update for openvpn
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http://www.openwall.com/lists/oss-security/2013/05/06/6
oss-security - Re: CVE request: OpenVPN use of non-constant-time memcmp in HMAC comparison in openvpn_decrypt
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http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105568.html
[SECURITY] Fedora 17 Update: openvpn-2.3.1-2.fc17
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http://lists.fedoraproject.org/pipermail/package-announce/2013-May/105609.html
[SECURITY] Fedora 18 Update: openvpn-2.3.1-2.fc18
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http://www.mandriva.com/security/advisories?name=MDVSA-2013:167
mandriva.com
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https://github.com/OpenVPN/openvpn/commit/11d21349a4e7e38a025849479b36ace7c2eec2ee
Use constant time memcmp when comparing HMACs in openvpn_decrypt. · OpenVPN/openvpn@11d2134 · GitHubExploit;Patch
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