Vulnerability identifier: #VU44912

Vulnerability risk: Medium

CVSSv3.1: 6.5 [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-2011-1770

CWE-ID: CWE-125

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 boundary error in Integer underflow in the dccp_parse_options function (net/dccp/options.c) in the Linux kernel before 2.6.33.14. A remote attacker can perform a denial of service via a Datagram Congestion Control Protocol (DCCP) packet with an invalid feature options length, which triggers a buffer over-read.

Mitigation
Update to version 2.6.33.14.

Vulnerable software versions

Linux kernel: 2.6.33.1 - 2.6.33.13

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External links
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061236.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-June/061366.html
http://marc.info/?l=linux-kernel&m=130468845209036&w=2
http://marc.info/?l=linux-kernel&m=130469305815140&w=2
http://secunia.com/advisories/44932
http://securityreason.com/securityalert/8286
http://www.kernel.org/pub/linux/kernel/v2.6/longterm/v2.6.33/ChangeLog-2.6.33.14
http://www.securityfocus.com/bid/47769
http://www.securitytracker.com/id?1025592
http://bugzilla.redhat.com/show_bug.cgi?id=703011

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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.