Buffer overflow in the sppp driver in FreeBSD 4.11 through 6.1, NetBSD 2.0 through 4.0 beta before 20060823, and OpenBSD 3.8 and 3.9 before 20060902 allows remote attackers to cause a denial of service (panic), obtain sensitive information, and possibly execute arbitrary code via crafted Link Control Protocol (LCP) packets with an option length that exceeds the overall length, which triggers the overflow in (1) pppoe and (2) ippp. NOTE: this issue was originally incorrectly reported for the ppp driver.
ftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2006-019.txt.asc
secunia.com/advisories/21587
secunia.com/advisories/21731
security.FreeBSD.org/advisories/FreeBSD-SA-06:18.ppp.asc
security.FreeBSD.org/patches/SA-06:18/ppp4x.patch
securitytracker.com/id?1016745
www.openbsd.org/errata.html#sppp
www.openbsd.org/errata38.html#sppp
www.securityfocus.com/bid/19684
exchange.xforce.ibmcloud.com/vulnerabilities/28562