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Vigil@nce: Linux kernel, denial of service via GRE/Tunnel

February 2010 by Vigil@nce

When the system starts, an attacker can send a tunneled packet, in order to stop the system.

- Severity: 2/4
- Consequences: denial of service of computer
- Provenance: intranet client
- Means of attack: no proof of concept, no attack
- Ability of attacker: expert (4/4)
- Confidence: confirmed by the editor (5/5)
- Diffusion of the vulnerable configuration: high (3/3)
- Creation date: 18/02/2010

IMPACTED PRODUCTS

- Linux kernel

DESCRIPTION OF THE VULNERABILITY

The Linux kernel implements several tunnel types :
- GRE (Generic Routing Encapsulation) : net/ipv4/ip_gre.c
- IP in IP : net/ipv4/ipip.c
- IPv6 : net/ipv6/ip6_tunnel.c
- IPv6 : net/ipv6/sit.c
- IPv6 : net/ipv6/xfrm6_tunnel.c

When these protocols are compiled as kernel modules, and when a packet is received before the module loading, an error occurs in net_generic(), and stops the kernel.

When the system starts, an attacker can therefore send a tunneled packet, in order to stop the system.

CHARACTERISTICS

- Identifiers: BID-38301, BID-38303, VIGILANCE-VUL-9461
- Url: http://vigilance.fr/vulnerability/L...




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