MitM attack in OpenConnect VPN client
| Risk | Medium |
| Patch available | YES |
| Number of vulnerabilities | 1 |
| CVE-ID | CVE-2020-12105 |
| CWE-ID | CWE-300 |
| Exploitation vector | Local network |
| Public exploit | N/A |
| Vulnerable software Subscribe |
OpenConnect VPN Client Client/Desktop applications / Other client software |
| Vendor | OpenConnect |
Security Bulletin
This security bulletin contains one medium risk vulnerability.
1) Man-in-the-Middle (MitM) attack
EUVDB-ID: #VU28215
Risk: Medium
CVSSv3.1: 5.6 [CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H/E:U/RL:O/RC:C]
CVE-ID: CVE-2020-12105
CWE-ID:
CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')
Exploit availability: No
DescriptionThe vulnerability allows a remote attacker to perform a Man-in-the-Middle attack.
The vulnerability exists due to OpenConnect mishandles negative return values from X509_check_ function calls. A remote attacker can perform a Man-in-the-Middle (MitM) attack and gain access to data, transferred via VPN connection.
Install updates from vendor's website.
Vulnerable software versionsOpenConnect VPN Client: 8.00 - 8.08
External linkshttp://lists.opensuse.org/opensuse-security-announce/2020-05/msg00039.html
http://gitlab.com/openconnect/openconnect/-/merge_requests/96
Q & A
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
