Debian Security Advisory

DSA-851-1 openvpn -- programming errors

Date Reported:
09 Oct 2005
Affected Packages:
Security database references:
In the Debian bugtracking system: Bug 324167.
In Mitre's CVE dictionary: CVE-2005-2531, CVE-2005-2532, CVE-2005-2533, CVE-2005-2534.
More information:

Several security related problems have been discovered in openvpn, a Virtual Private Network daemon. The Common Vulnerabilities and Exposures project identifies the following problems:

  • CAN-2005-2531

    Wrong processing of failed certificate authentication when running with "verb 0" and without TLS authentication can lead to a denial of service by disconnecting the wrong client.

  • CAN-2005-2532

    Wrong handling of packets that can't be decrypted on the server can lead to the disconnection of unrelated clients.

  • CAN-2005-2533

    When running in "dev tap" Ethernet bridging mode, openvpn can exhaust its memory by receiving a large number of spoofed MAC addresses and hence denying service.

  • CAN-2005-2534

    Simultaneous TCP connections from multiple clients with the same client certificate can cause a denial of service when --duplicate-cn is not enabled.

The old stable distribution (woody) does not contain openvpn packages.

For the stable distribution (sarge) these problems have been fixed in version 2.0-1sarge1.

For the unstable distribution (sid) these problems have been fixed in version 2.0.2-1.

We recommend that you upgrade your openvpn package.

Fixed in:

Debian GNU/Linux 3.1 (sarge)

Intel IA-32:
Intel IA-64:
Motorola 680x0:
Big endian MIPS:
Little endian MIPS:
IBM S/390:
Sun Sparc:

MD5 checksums of the listed files are available in the original advisory.