The bgp_nlri_parse_vpnv4 function in bgp_mplsvpn.c in the VPNv4 NLRI
parser in bgpd in Quagga before 1.0.20160309, when a certain VPNv4
configuration is used, relies on a Labeled-VPN SAFI routes-data length
field during a data copy, which allows remote attackers to execute
arbitrary code or cause a denial of service (stack-based buffer
overflow) via a crafted packet.
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