Multiple vulnerabilities in OpenVPN



Published: 2017-06-21 | Updated: 2017-06-22
Risk High
Patch available YES
Number of vulnerabilities 5
CVE-ID CVE-2017-7522
CVE-2017-7512
CVE-2017-7521
CVE-2017-7508
CVE-2017-7520
CWE-ID CWE-20
CWE-401
CWE-415
CWE-617
CWE-200
Exploitation vector Network
Public exploit N/A
Vulnerable software
Subscribe 		OpenVPN for Windows
Client/Desktop applications / Software for system administration

Vendor openvpn.net

Security Bulletin

This security bulletin contains information about 5 vulnerabilities.

1) Improper input validation

EUVDB-ID: #VU7141

Risk: Low

CVSSv3.1: 3.8 [CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7522

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to an error when processing --x509-track attribute within mbedtls. A remote authenticated attacker can perform denial of service (DoS) attack.

Mitigation

Update OpenVPN to version 2.4.3.

Vulnerable software versions

OpenVPN for Windows: 2.4.0 - 2.4.2

CPE2.3 External links

http://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

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

2) Memory leak

EUVDB-ID: #VU7142

Risk: Medium

CVSSv3.1: 5.1 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7512

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to multiple errors. A remote attacker can trigger memory leak and gain unauthorized access to potentially sensitive information.

Mitigation

Update OpenVPN to version 2.4.3.

Vulnerable software versions

OpenVPN for Windows: 2.4.0 - 2.4.2

CPE2.3 External links

http://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24


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.

3) Double free error

EUVDB-ID: #VU7143

Risk: High

CVSSv3.1: 8.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7521

CWE-ID: CWE-415 - Double Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to double free error when processing --x509-alt-username attribute. A remote unauthenticated attacker can trigger double free error and crash the affected server or potentially execute arbitrary code.

Successful exploitation of the vulnerability may allow an attacker to compromise vulnerable system.

Mitigation

Update OpenVPN to version 2.4.3.

Vulnerable software versions

OpenVPN for Windows: 2.4.0 - 2.4.2

CPE2.3 External links

http://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24


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.

4) Improper input validation

EUVDB-ID: #VU7144

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7508

CWE-ID: CWE-617 - Reachable Assertion

Exploit availability: No

Description

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

The vulnerability exists due assertion failure when processing IPv6 packets. A remote attacker can send a specially crafted IPv6 packet and perform a denial of service (DoS) attack.

Mitigation

Update OpenVPN to version 2.4.3.

Vulnerable software versions

OpenVPN for Windows: 2.4.0 - 2.4.2

CPE2.3 External links

http://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24


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.

5) MitM attack

EUVDB-ID: #VU7165

Risk: Low

CVSSv3.1: 4.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2017-7520

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack or obtain potentially sensitive client's information.

If clients use a HTTP proxy with NTLM authentication (i.e. "--http-proxy <server> <port> [<authfile>|'auto'|'auto-nct'] ntlm2"), a man-in-the-middle attacker between the client and the proxy can cause the client to crash or disclose at most 96 bytes of stack memory. The disclosed stack memory is likely to contain the proxy password.

Mitigation

Update OpenVPN to version 2.4.3.

Vulnerable software versions

OpenVPN for Windows: 2.4.0 - 2.4.2

CPE2.3 External links

http://community.openvpn.net/openvpn/wiki/ChangesInOpenvpn24


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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