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Home » Security Advisories» OpenPKG » OpenVPN denial of service issues

OpenVPN denial of service issues

According to a BUGTRAQ report, a Denial of Service (DoS) vulnerability exists in the OpenVPN network security application. The vulnerability allows a malicious or compromised server to execute arbitrary code on the client. Additionally, another DoS situation can occur if OpenVPN in TCP server mode receives an error on accept and the resulting exception handler causes a segmentation fault.

  • Vendor: OpenPKG
  • Vendor ID: GLSA 200511-02
  • Date: November 02, 2005


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________________________________________________________________________

OpenPKG Security Advisory The OpenPKG Project
http://www.openpkg.org/security.html http://www.openpkg.org
[email protected] [email protected]
OpenPKG-SA-2005.023 02-Nov-2005
________________________________________________________________________

Package: openvpn
Vulnerability: arbitrary code execution, denial of service
OpenPKG Specific: no

Affected Releases: Affected Packages: Corrected Packages:
OpenPKG CURRENT <= openvpn-2.0.2-20050928 >= openvpn-2.0.4-20051102
OpenPKG 2.5 <= openvpn-2.0.2-2.5.0 >= openvpn-2.0.2-2.5.1
OpenPKG 2.4 <= openvpn-2.0-2.4.0 >= openvpn-2.0-2.4.1
OpenPKG 2.3 N.A. N.A.

Dependent Packages: none

Description:
According to a BUGTRAQ report [0], a Denial of Service (DoS)
vulnerability exists in the OpenVPN [1] network security application.
The vulnerability allows a malicious or compromised server to execute
arbitrary code on the client. The Common Vulnerabilities and Exposures
(CVE) project assigned the id CVE-2005-3393 [2] to the problem.

Additionally, another DoS situation can occur if OpenVPN in TCP server
mode receives an error on accept(2) and the resulting exception
handler causes a segmentation fault. The Common Vulnerabilities and
Exposures (CVE) project assigned the id CVE-2005-3409 [3] to the
problem.

Please check whether you are affected by running "/bin/openpkg
rpm -q openvpn". If you have the "openvpn" package installed and its
version is affected (see above), we recommend that you immediately
upgrade it (see Solution) [4][5].

Solution:
Select the updated source RPM appropriate for your OpenPKG release
[6][7], fetch it from the OpenPKG FTP service [8][9] or a mirror
location, verify its integrity [10], build a corresponding binary
RPM from it [3] and update your OpenPKG installation by applying the
binary RPM [5]. For the most recent release OpenPKG 2.5, perform the
following operations to permanently fix the security problem (for
other releases adjust accordingly).

$ ftp ftp.openpkg.org
ftp> bin
ftp> cd release/2.5/UPD
ftp> get openvpn-2.0.2-2.5.1.src.rpm
ftp> bye
$ /bin/openpkg rpm -v --checksig openvpn-2.0.2-2.5.1.src.rpm
$ /bin/openpkg rpm --rebuild openvpn-2.0.2-2.5.1.src.rpm
$ su -
# /bin/openpkg rpm -Fvh /RPM/PKG/openvpn-2.0.2-2.5.1.*.rpm
________________________________________________________________________

References:
[0] http://marc.theaimsgroup.com/?l=bugtraq&m=113081023121059&w=2
[1] http://www.openvpn.net/
[2] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3393
[3] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3409
[4] http://www.openpkg.org/tutorial.html#regular-source
[5] http://www.openpkg.org/tutorial.html#regular-binary
[6] ftp://ftp.openpkg.org/release/2.5/UPD/openvpn-2.0.2-2.5.1.src.rpm
[7] ftp://ftp.openpkg.org/release/2.4/UPD/openvpn-2.0-2.4.1.src.rpm
[8] ftp://ftp.openpkg.org/release/2.5/UPD/
[9] ftp://ftp.openpkg.org/release/2.4/UPD/
[10] http://www.openpkg.org/security.html#signature
________________________________________________________________________

For security reasons, this advisory was digitally signed with the
OpenPGP public key "OpenPKG " (ID 63C4CB9F) of the
OpenPKG project which you can retrieve from http://pgp.openpkg.org and
hkp://pgp.openpkg.org. Follow the instructions on http://pgp.openpkg.org/
for details on how to verify the integrity of this advisory.
________________________________________________________________________

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