SB2020061524 - Gentoo update for OpenConnect

Description

This security bulletin contains information about 2 secuirty vulnerabilities.

1) Man-in-the-Middle (MitM) attack (CVE-ID: CVE-2020-12105)

The 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.

2) Buffer overflow (CVE-ID: CVE-2020-12823)

The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to a boundary within the get_cert_name() function in gnutls.c. A remote attacker can trick the victim to connect to a malicious VPN server, trigger buffer overflow and crash the client or execute arbitrary code on the system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Remediation

Install update from vendor's website.

References

• https://security.gentoo.org/
• https://security.gentoo.org/glsa/202006-15