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Vigil@nce: Linux kernel, memory corruption of sctp_getsockopt_local_addrs_old

July 2008 by Vigil@nce

A local attacker can create a SCTP socket in order to stop the
system and eventually to execute code.

 Gravity: 2/4
 Consequences: denial of service of computer
 Provenance: user account
 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: 08/07/2008
 Identifier: VIGILANCE-VUL-7935

IMPACTED PRODUCTS

Linux kernel [confidential versions]

DESCRIPTION

The SCTP protocol (Stream Control Transmission Protocol) creates
associations to send several streams.

The sctp_getsockopt_local_addrs_old() function of the
net/sctp/socket.c file defines local addresses and is called via
setsockopt(). However, this function does not check the number of
received addresses (addr_num) which overflows an integer, then
allocates a short memory area.

A local attacker can therefore create a SCTP socket in order to
stop the system and eventually to execute code.

CHARACTERISTICS

 Identifiers: BID-29990, CVE-2008-2826, VIGILANCE-VUL-7935
 Url: https://vigilance.aql.fr/tree/1/7935


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