|Number of vulnerabilities||1|
|CVE ID|| CVE-2020-13777
|CWE ID|| CWE-300
|Exploitation vector||Local network|
|Public exploit||Public exploit code for vulnerability #1 is available.|
gnutls28 (Ubuntu package)
Operating systems & Components / Operating system package or component
This security advisory describes one medium risk vulnerability.
CVSSv3.1: 5.5 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:P/RL:O/RC:C] [PCI]
Exploit availability: YesDescription
The vulnerability allows a remote attacker to perform Man-in-the-Middle (MitM) attack.
The vulnerability exists due to regression, introduced into the TLS protocol implementation that caused the TLS server to not securely construct a session ticket encryption key considering the application supplied secret. A remote attacker can bypass authentication in TLS 1.3 and recover previous conversations in TLS 1.2Mitigation
Update the affected packages.
gnutls28 (Ubuntu package): 3.6.9, 3.6.9-1, 3.6.9-2, 3.6.9-3, 3.6.9-3ubuntu1, 3.6.9-4, 3.6.9-4build1, 3.6.9-5, 3.6.9-5ubuntu1, 3.6.9-5ubuntu1.1, 3.6.9-5ubuntu2, 3.6.9-6, 3.6.9-7, 3.6.13, 3.6.13-1, 3.6.13-2, 3.6.13-2ubuntu1, 3.6.13-2ubuntu1.1, 3.6.13-3, 3.6.13-4ubuntu1CPE
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. However, proof of concept for this vulnerability is available.