Vulnerability identifier: #VU44878

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2011-1093

CWE-ID: CWE-476

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Linux kernel
Operating systems & Components / Operating system

Vendor: Linux Foundation

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error in net/dccp/input.c in the Datagram Congestion Control Protocol (DCCP) implementation in the Linux kernel before 2.6.38 does not properly handle packets for a CLOSED endpoint, which allows remote attackers to cause a denial of service (NULL pointer dereference and OOPS) by sending a DCCP-Close packet followed by a DCCP-Reset packet. A remote attacker can perform a denial of service (DoS) attack.

Mitigation
Update to version 2.6.38.

Vulnerable software versions

Linux kernel: 2.6.0 - 2.6.37.6

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External links
http://downloads.avaya.com/css/P8/documents/100145416
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=720dc34bbbe9493c7bd48b2243058b4e447a929d
http://openwall.com/lists/oss-security/2011/03/08/19
http://openwall.com/lists/oss-security/2011/03/08/4
http://rhn.redhat.com/errata/RHSA-2011-0833.html
http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.38
http://www.securityfocus.com/bid/46793
http://bugzilla.redhat.com/show_bug.cgi?id=682954

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.