OpenVPN 2.x before 2.0.11, 2.1.x, 2.2.x before 2.2.3, and 2.3.x before 2.3.6 allows remote authenticated users to cause a denial of service (server crash) via a small control channel packet.

Fix for CVE-2014-8104.

https://community.openvpn.net/openvpn/wiki/SecurityAnnouncement-97597e 732b

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The remote host is affected by the vulnerability described in GLSA-201412-41 (OpenVPN: Denial of Service)

    OpenVPN does not properly handle control channel packets that are too       small.
  Impact :

    A remote authenticated attacker could send a specially crafted control       channel packet, possibly resulting in a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

Updated openvpn packages fix security vulnerability :

Dragana Damjanovic discovered that OpenVPN incorrectly handled certain control channel packets. An authenticated attacker could use this issue to cause an OpenVPN server to crash, resulting in a denial of service (CVE-2014-8104).

The openvpn packages has been updated to the 2.3.2 version and patched to correct this issue.

This update fixes a critical denial of service vulnerability in OpenVPN :

  - Critical denial of service vulnerability in OpenVPN     servers that can be triggered by authenticated     attackers. Also an incompatibility with OpenVPN and     OpenSSL in FIPS mode has been fixed. (bnc#895882).
    (CVE-2014-8104)

New openvpn packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1, and -current to fix a security issue.

A remote denial of service attack against openvpn was fixed, where a authenticated client cloud stop the server by triggering a server-side ASSERT (CVE-2014-8104),

Note that Tenable Network Security has extracted the preceding description block directly from the SUSE security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

According to its self-reported version number, the version of OpenVPN installed on the remote host is affected by an error related to 'Control Channel Packet' handling and TLS-authenticated clients that could allow denial of service attacks.

Updated openvpn packages fix security vulnerability :

Dragana Damjanovic discovered that OpenVPN incorrectly handled certain control channel packets. An authenticated attacker could use this issue to cause an OpenVPN server to crash, resulting in a denial of service (CVE-2014-8104).

ID	名称	产品	系列	发布时间	最近更新时间	严重程度
79873	Amazon Linux AMI : openvpn (ALAS-2014-459)	Nessus	Amazon Linux Local Security Checks	2014/12/15	2018/4/18	medium
79922	Fedora 19 : openvpn-2.3.6-1.fc19 / pkcs11-helper-1.11-3.fc19 (2014-16234)	Nessus	Fedora Local Security Checks	2014/12/15	2021/1/11	medium
80262	GLSA-201412-41 : OpenVPN: Denial of Service	Nessus	Gentoo Local Security Checks	2014/12/29	2021/1/6	medium
79991	Mandriva Linux Security Advisory : openvpn (MDVSA-2014:246)	Nessus	Mandriva Local Security Checks	2014/12/15	2021/1/6	medium
79822	SuSE 11.3 Security Update : OpenVPN (SAT Patch Number 10061)	Nessus	SuSE Local Security Checks	2014/12/9	2021/1/19	medium
79869	Slackware 13.0 / 13.1 / 13.37 / 14.0 / 14.1 / current : openvpn (SSA:2014-344-04)	Nessus	Slackware Local Security Checks	2014/12/15	2021/1/14	medium
79930	Fedora 20 : openvpn-2.3.6-1.fc20 / pkcs11-helper-1.11-3.fc20 (2014-16273)	Nessus	Fedora Local Security Checks	2014/12/15	2021/1/11	medium
83652	SUSE SLED12 / SLES12 Security Update : openvpn (SUSE-SU-2014:1694-1)	Nessus	SuSE Local Security Checks	2015/5/20	2021/1/19	medium
79746	OpenVPN 2.x < 2.2.3 / 2.3.6 Control Channel Packet Handling DoS	Nessus	Windows	2014/12/5	2019/11/25	medium
82392	Mandriva Linux Security Advisory : openvpn (MDVSA-2015:139)	Nessus	Mandriva Local Security Checks	2015/3/30	2021/1/14	medium

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