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Vigil@nce: Linux kernel, denial of service via SCTP INIT

April 2011 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

A local attacker can send a special SCTP INIT/INIT-ACK packet, in order to stop the kernel.

- Severity: 1/4
- Creation date: 12/04/2011

IMPACTED PRODUCTS

- Linux kernel

DESCRIPTION OF THE VULNERABILITY

The SCTP protocol uses chunks of type:
- 0 : Payload Data (DATA)
- 1 : Initialization (INIT)
- 2 : Initialization Acknowledgment (INIT-ACK)
- 9 : Operation Error (ERROR)
- etc.

The sctp_make_init() and sctp_make_init_ack() functions create INIT and INIT-ACK packets. However, the padding of auth_hmacs and auth_chunks field are not counted in the packet size. This error leads to a call to the BUG() macro which stops the kernel.

A local attacker can therefore send a SCTP INIT/INIT-ACK packet with hmacs/chunks fields, in order to create a denial of service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/L...




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