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
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Subject: NetBSD PPPoE Packet Processing Tag Length Vulnerability
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