OpenVPN Client Remote Format String Vulnerability

BID:15239

Info

OpenVPN Client Remote Format String Vulnerability

Bugtraq ID: 15239
Class: Input Validation Error
CVE:
Remote: Yes
Local: No
Published: Oct 31 2005 12:00AM
Updated: Oct 31 2005 12:00AM
Credit: Discovery is credited to vade79 <[email protected]>.
Vulnerable: S.u.S.E. Linux Professional 10.0 OSS
S.u.S.E. Linux Professional 10.0
S.u.S.E. Linux Professional 9.3 x86_64
S.u.S.E. Linux Professional 9.3
S.u.S.E. Linux Personal 10.0 OSS
S.u.S.E. Linux Personal 9.3 x86_64
S.u.S.E. Linux Personal 9.3
OpenVPN OpenVPN 2.0.2
OpenVPN OpenVPN 2.0.1
OpenVPN OpenVPN 2.0 beta11
OpenVPN OpenVPN 2.0
+ Debian Linux 3.1 sparc
 + Debian Linux 3.1 s/390
 + Debian Linux 3.1 ppc
 + Debian Linux 3.1 mipsel
 + Debian Linux 3.1 mips
 + Debian Linux 3.1 m68k
 + Debian Linux 3.1 ia-64
 + Debian Linux 3.1 ia-32
 + Debian Linux 3.1 hppa
 + Debian Linux 3.1 arm
 + Debian Linux 3.1 amd64
 + Debian Linux 3.1 alpha
 + Debian Linux 3.1
OpenPKG OpenPKG 2.5
OpenPKG OpenPKG 2.4
OpenPKG OpenPKG 2.3
OpenPKG OpenPKG Current
Mandriva Linux Mandrake 2006.0 x86_64
Mandriva Linux Mandrake 2006.0
MandrakeSoft Multi Network Firewall 2.0
MandrakeSoft Corporate Server 3.0
Gentoo Linux
Not Vulnerable: OpenVPN OpenVPN 2.0.4

Discussion

OpenVPN Client Remote Format String Vulnerability

OpenVPN is reported prone to a remote format string vulnerability.

A malicious server can send specially crafted command options such as 'dhcp-option' including format specifiers to a client to trigger this vulnerability.

A remote attacker may leverage this issue to write to arbitrary process memory, facilitating code execution. This can result in unauthorized remote access.

This issue affects OpenVPN 2.0.x versions. OpenVPN running on Windows is not vulnerable to this issue.

Exploit / POC

OpenVPN Client Remote Format String Vulnerability

Currently we are not aware of any exploits for this issue. If you feel we are in error or are aware of more recent information, please mail us at: [email protected] <mailto:[email protected]>.

Solution / Fix

OpenVPN Client Remote Format String Vulnerability

Solution:
OpenVPN 2.0.4 is available to address this issue.

OpenPKG advisory OpenPKG-SA-2005.023 is available to address this issue. Please see the referenced advisory for more information.

SUSE has released advisory SUSE-SR:2005:025 to address this, and other issues in various packages, in various SUSE products. Please see the referenced advisory for further information.

Debian has released advisory DSA 885-1 to address this issue. Please see the referenced advisory for more information.

Gentoo has released advisory GLSA 200511-07 to address this issue. Please see the referenced advisory for more information. Gentoo users may carry out the following commands to update their computers:

emerge --sync
emerge --ask --oneshot --verbose ">=net-misc/openvpn-2.0.4"

Mandriva advisory MDKSA-2005:206 is available to address this issue in Multi Network Firewall 2.0. Please see the referenced advisory for more information.

Mandriva advisory MDKSA-2005:206-1 is available to address this issue. Please see the referenced advisory for more information.


OpenVPN OpenVPN 2.0

OpenVPN OpenVPN 2.0 beta11

OpenVPN OpenVPN 2.0.1

OpenVPN OpenVPN 2.0.2

References

OpenVPN Client Remote Format String Vulnerability

References:

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