SUSE update for openvpn



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2020-11810
CVE-2020-15078
CWE-ID CWE-399
CWE-287
Exploitation vector Network
Public exploit N/A
Vulnerable software
 SUSE Linux Enterprise Module for Basesystem
Operating systems & Components / Operating system

openvpn-devel
Operating systems & Components / Operating system package or component

openvpn-debugsource
Operating systems & Components / Operating system package or component

openvpn-debuginfo
Operating systems & Components / Operating system package or component

openvpn-auth-pam-plugin-debuginfo
Operating systems & Components / Operating system package or component

openvpn-auth-pam-plugin
Operating systems & Components / Operating system package or component

openvpn
Operating systems & Components / Operating system package or component

Vendor SUSE

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Resource management error

EUVDB-ID: #VU27616

Risk: Low

CVSSv4.0: 1.7 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2020-11810

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to improper management of internal resources within the application that allows a timing attack to be carried out against OpenVPN clients.

An attacker can inject a data channel v2 (P_DATA_V2) packet using a victim's peer-id. Normally such packets are dropped, but if this packet arrives before the data channel crypto parameters have been initialized, the victim's connection will be dropped. This requires careful timing due to the small time window (usually within a few seconds) between the victim client connection starting and the server PUSH_REPLY response back to the client. This attack will only work if Negotiable Cipher Parameters (NCP) is in use.

Mitigation

Update the affected package openvpn to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Basesystem: 15-SP2 - 15-SP3

openvpn-devel: before 2.4.3-5.7.1

openvpn-debugsource: before 2.4.3-5.7.1

openvpn-debuginfo: before 2.4.3-5.7.1

openvpn-auth-pam-plugin-debuginfo: before 2.4.3-5.7.1

openvpn-auth-pam-plugin: before 2.4.3-5.7.1

openvpn: before 2.4.3-5.7.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20211577-1/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.

2) Improper authentication

EUVDB-ID: #VU52479

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2020-15078

CWE-ID: CWE-287 - Improper Authentication

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass authentication process.

The vulnerability exists due to an error in when processing authentication requests. A remote attacker can bypass authentication and access control channel data on servers configured with deferred authentication, which can be used to potentially trigger further information leaks.

Under certain circumstances an attacker can trick the server using delayed authentication (plugin or management) into returning a PUSH_REPLY before the AUTH_FAILED message, which can possibly be used to gather information about a VPN setup. In combination with "--auth-gen-token" or a user-specific token auth solution it can be possible to get access to a VPN with an otherwise-invalid account.

Mitigation

Update the affected package openvpn to the latest version.

Vulnerable software versions

SUSE Linux Enterprise Module for Basesystem: 15-SP2 - 15-SP3

openvpn-devel: before 2.4.3-5.7.1

openvpn-debugsource: before 2.4.3-5.7.1

openvpn-debuginfo: before 2.4.3-5.7.1

openvpn-auth-pam-plugin-debuginfo: before 2.4.3-5.7.1

openvpn-auth-pam-plugin: before 2.4.3-5.7.1

openvpn: before 2.4.3-5.7.1

CPE2.3 External links

https://www.suse.com/support/update/announcement/2021/suse-su-20211577-1/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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