Technical Description

Multiple vulnerabilities have been identified in Linux Kernel, which could be exploited by remote attackers to cause a denial of service.

The first issue is due to an error in the Stream Control Transmission Protocol (SCTP) code that uses incorrect state table entries when certain ECNE chunks are received in CLOSED state, which could be exploited by attackers to cause a kernel panic via a specially crafted packet.

The second flaw is due to an error when handling incoming IP-fragmented SCTP control chunks, which could be exploited by attackers to cause a kernel panic via a specially crafted packet.

The third vulnerability is due to an infinite recursion in the "sctp_skb_pull()" function of "lksctp", which could be exploited by attackers to crash a vulnerable system during message reassembly via a specially crafted packet.

The fourth issue is due to a deadlock error in the receive buffer when processing a large number of messages, which could be exploited by attackers to cause a denial of service.

Affected Products

Linux Kernel version 2.6.16.14 and prior
Linux Kernel version 2.4.32 and prior

Solution

Upgrade to Linux Kernel version 2.6.16.15 or 2.4.33 :
http://www.kernel.org

References

http://www.vupen.com/english/advisories/2006/1734
http://www.frsirt.com/english/reference/11482

Credits

Vulnerabilities reported by Mu Security research team and the vendor

ChangeLog

2006-05-09 : Initial release
2006-05-09 : Updated Solution
2006-08-12 : Updated Solution

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