CVSS Meta Temp Score | Current Exploit Price (≈) | CTI Interest Score |
---|---|---|
3.6 | $0-$5k | 0.00 |
A vulnerability, which was classified as problematic, was found in OpenVPN up to 2.3.0 (Network Encryption Software). Affected is the function openvpn_decrypt
. The manipulation with the input value HMAC
leads to a information disclosure vulnerability. CWE is classifying the issue as CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. This is going to have an impact on confidentiality. CVE summarizes:
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.
The weakness was released 04/10/2013 as SecurityAnnouncement-f375aa67cc as not defined advisory (Website). The advisory is shared for download at community.openvpn.net. This vulnerability is traded as CVE-2013-2061 since 02/19/2013. The exploitability is told to be difficult. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1592.
The vulnerability scanner Nessus provides a plugin with the ID 71136 (SuSE 11.2 Security Update : openvpn (SAT Patch Number 8496)), which helps to determine the existence of the flaw in a target environment. It is assigned to the family SuSE Local Security Checks.
Upgrading to version 2.3.1 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version. A possible mitigation has been published immediately after the disclosure of the vulnerability.
The vulnerability is also documented in the databases at X-Force (84050) and Tenable (71136).
Product
Type
Name
Version
License
CPE 2.3
CPE 2.2
CVSSv4
VulDB CVSS-B Score: 🔍VulDB CVSS-BT Score: 🔍
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv3
VulDB Meta Base Score: 3.7VulDB Meta Temp Score: 3.6
VulDB Base Score: 3.7
VulDB Temp Score: 3.6
VulDB Vector: 🔍
VulDB Reliability: 🔍
CVSSv2
AV | AC | Au | C | I | A |
---|---|---|---|---|---|
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
💳 | 💳 | 💳 | 💳 | 💳 | 💳 |
Vector | Complexity | Authentication | Confidentiality | Integrity | Availability |
---|---|---|---|---|---|
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
unlock | unlock | unlock | unlock | unlock | unlock |
VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍
NVD Base Score: 🔍
Exploiting
Class: Information disclosureCWE: CWE-200 / CWE-284 / CWE-266
ATT&CK: T1592
Local: No
Remote: Yes
Availability: 🔍
Status: Not defined
EPSS Score: 🔍
EPSS Percentile: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍
0-Day | unlock | unlock | unlock | unlock |
---|---|---|---|---|
Today | unlock | unlock | unlock | unlock |
Nessus ID: 71136
Nessus Name: SuSE 11.2 Security Update : openvpn (SAT Patch Number 8496)
Nessus File: 🔍
Nessus Risk: 🔍
Nessus Family: 🔍
Nessus Port: 🔍
OpenVAS ID: 865625
OpenVAS Name: Fedora Update for openvpn FEDORA-2013-7531
OpenVAS File: 🔍
OpenVAS Family: 🔍
Threat Intelligence
Interest: 🔍Active Actors: 🔍
Active APT Groups: 🔍
Countermeasures
Recommended: UpgradeStatus: 🔍
Reaction Time: 🔍
0-Day Time: 🔍
Exposure Time: 🔍
Upgrade: OpenVPN 2.3.1
Patch: github.com
Timeline
02/19/2013 🔍04/10/2013 🔍
04/10/2013 🔍
05/06/2013 🔍
05/06/2013 🔍
05/08/2013 🔍
05/26/2013 🔍
11/17/2013 🔍
11/29/2013 🔍
05/10/2021 🔍
Sources
Advisory: SecurityAnnouncement-f375aa67ccStatus: Not defined
Confirmation: 🔍
CVE: CVE-2013-2061 (🔍)
OVAL: 🔍
X-Force: 84050
Vulnerability Center: 39702 - OpenVPN <2.3.1 'openvpn_decrypt()\x27 Function Flaw Allows Remote Information Disclosure Vulnerability, Medium
SecurityFocus: 59672 - OpenVPN 'openvpn_decrypt()' Function Information Disclosure Vulnerability
OSVDB: 93023
Entry
Created: 05/08/2013 17:05Updated: 05/10/2021 14:31
Changes: 05/08/2013 17:05 (74), 04/30/2017 12:43 (4), 05/10/2021 14:31 (3)
Complete: 🔍
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