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computer vulnerability announce CVE-2015-8605

ISC DHCP: buffer overflow of decode_udp_ip_header

Synthesis of the vulnerability

An attacker can generate a buffer overflow by sending an IPv4+UDP packet to an ISC DHCP client or server, in order to trigger a denial of service, and possibly to run code.
Impacted systems: SNS, ArubaOS, Debian, BIG-IP Hardware, TMOS, Fedora, ISC DHCP, NETASQ, openSUSE, openSUSE Leap, Slackware, Ubuntu.
Severity of this alert: 3/4.
Consequences of an intrusion: user access/rights, denial of service on service.
Pirate's origin: LAN.
Creation date: 13/01/2016.
Références of this alert: AA-01334, ARUBA-PSA-2016-007, CERTFR-2016-AVI-167, CVE-2015-8605, DSA-3442-1, FEDORA-2016-0c5bb21bf1, FEDORA-2016-adb533a418, openSUSE-SU-2016:0601-1, openSUSE-SU-2016:0610-1, SOL57500018, SSA:2016-012-01, STORM-2015-018, USN-2868-1, VIGILANCE-VUL-18707.

Description of the vulnerability

The DHCP protocol uses UDP packets.

The decode_udp_ip_header() function of the common/packet.c file of ISC DHCP decodes these UDP packets. However, if the size indicated in the IPv4 header for UDP data is too large, an overflow occurs.

An attacker can therefore generate a buffer overflow by sending an IPv4+UDP packet to an ISC DHCP client or server, in order to trigger a denial of service, and possibly to run code.
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