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NetBSD PPPoE Packet Processing Tag Length Vulnerability

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Release Date:  2008-08-26    Last Update:  2008-09-30    Views:  5,781

Secunia Advisory SA31597

Where:

From local network

Impact:

DoS, System access

Solution Status:

Vendor Patch

Operating System:

CVE Reference(s):

Description


A vulnerability has been reported in NetBSD, which can be exploited by malicious people to cause a DoS (Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused due incorrect length check when processing tags within a PPPoE packet. This can be exploited to e.g. crash the kernel by sending a specially crafted PPPoE packet to a vulnerable system.

Successful exploitation requires that a PPPoE interface has been created (e.g. via ""ifconfig pppoe0 create") and the attacker can send PPPoE packets to the affected system.

The vulnerability is reported in NetBSD version 3.0, 3.1, and 4.0.


Solution:
Fixed in the CVS repository. See vendor advisory for details.

Provided and/or discovered by:
The vendor credits Yasuoka Masahiko, Internet Initiative Japan Inc

Original Advisory:
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2008-010.txt.asc

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: NetBSD PPPoE Packet Processing Tag Length Vulnerability

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