Debian update for openvpn



Risk Medium
Patch available YES
Number of vulnerabilities 2
CVE-ID CVE-2023-46849
CVE-2023-46850
CWE-ID CWE-369
CWE-416
Exploitation vector Network
Public exploit N/A
Vulnerable software
 Debian Linux
Operating systems & Components / Operating system

openvpn (Debian package)
Operating systems & Components / Operating system package or component

Vendor Debian

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Division by zero

EUVDB-ID: #VU82952

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2023-46849

CWE-ID: CWE-369 - Divide By Zero

Exploit availability: No

Description

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

The vulnerability exists due to server incorrectly restores "--fragment" configuration under certain circumstances. A remote client can cause a divide by zero error and perform a denial of service (DoS) attack.

Mitigation

Update openvpn package to version 2.6.3-1+deb12u2.

Vulnerable software versions

Debian Linux: All versions

openvpn (Debian package): before 2.6.3-1+deb12u2

CPE2.3 External links

https://www.debian.org/security/2023/dsa-5555


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) Use-after-free

EUVDB-ID: #VU82951

Risk: Low

CVSSv4.0: 1.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2023-46850

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote user to gain access to sensitive information.

The vulnerability exists due to openvpn incorrectly uses a send buffer after it has been freed. Under certain circumstances the freed memory can be sent to the client peer, resulting in information disclosure. The vulnerability affects TLS configuration.

Mitigation

Update openvpn package to version 2.6.3-1+deb12u2.

Vulnerable software versions

Debian Linux: All versions

openvpn (Debian package): before 2.6.3-1+deb12u2

CPE2.3 External links

https://www.debian.org/security/2023/dsa-5555


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.



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