Multiple vulnerabilities in OpenVPN
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2023-46850 CVE-2023-46849 |
| CWE-ID | CWE-416 CWE-369 |
| Exploitation vector | Network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
OpenVPN Server applications / Remote access servers, VPN |
| Vendor | openvpn.net |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Use-after-free
EUVDB-ID: #VU82951
Risk: Low
CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-46850
CWE-ID:
CWE-416 - Use After Free
Exploit availability: No
DescriptionThe vulnerability allows a remote user to gain access to sensitive information.
The vulnerability exists due to openvpn incorrectly uses a send buffer after it has been freed. Under certain circumstances the freed memory can be sent to the client peer, resulting in information disclosure. The vulnerability affects TLS configuration.
Install updates from vendor's website.
Vulnerable software versionsOpenVPN: 2.6.0 - 2.6.6
External linkshttp://github.com/OpenVPN/openvpn/blob/v2.6.7/Changes.rst
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Division by zero
EUVDB-ID: #VU82952
Risk: Medium
CVSSv3.1: 5.7 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2023-46849
CWE-ID:
CWE-369 - Divide By Zero
Exploit availability: No
DescriptionThe vulnerability allows a remote client to perform a denial of service (DoS) attack.
The vulnerability exists due to server incorrectly restores "--fragment" configuration under certain circumstances. A remote client can cause a divide by zero error and perform a denial of service (DoS) attack.
Install updates from vendor's website.
Vulnerable software versionsOpenVPN: 2.6.0 - 2.6.6
External linkshttp://github.com/OpenVPN/openvpn/blob/v2.6.7/Changes.rst
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.
How the attacker can exploit this vulnerability?
The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
