September 2009

ID: 3888
Date: 11/09/2009

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Title: 3888 - Vulnerabilities have been discovered in some implementations of TCP.
Platform level affected:Operating System
Specific operating systems components affected: Other
Net-enabled software: Other
Other software: Other
Remediation Summary:Update your copy of the software with the download available from the supplier.
Vendors affected:Various
Applications affected:TCP
Adversity source: Unknown
Attack Vector: Vulnerability exploitation
Virulence: Unknown
Warning Status: Unknown
Potential Damage: Remote execution/modification
Possible Duration: Unknown
Availability of fix: Available
Type of fix: Patch
Source: CERT-FI
Reliability of source: Trusted
Source URL: http://cert.fi/haavoittuvuudet/2008/tcp-vulnerabilities.html
Abstract: Warning of CERT-FI advisory concerning TCP vulnerabilities.

Vulnerabilities have been discovered in some implementations of TCP.

Targets include servers and server applications, workstations and end user applications, network devices, embedded systems and mobile devices. Attacks exploiting the vulnerabilities may result in a denial of service (DoS) and do not require significant bandwidth to be successful.

Remediation

CERT-FI, who have been coordinating this issue with Outpost24 and vendors, advise that, where possible, users patch the vulnerable software components according to the guidance published by the vendor. Where TCP stack implementations are vulnerable but vendors have not provided a patch then white-listing access to TCP services on critical systems and routers is currently the most effective means for mitigation. (An attacker must be able to establish TCP sockets to affect the target - the attacks cannot be spoofed.)

For further details see CERT-FIs advisory
http://cert.fi/haavoittuvuudet/2008/tcp-vulnerabilities.html

This advisory contains information released by the original author. Some of the information may have changed since it was released. If the issue affects you, it may be prudent to retrieve the advisory from the site of the original source to ensure that you receive the most current information concerning that problem. Reference to any specific commercial product, process, or service by trade name, trademark manufacturer, or otherwise, does not constitute or imply its endorsement, recommendation, or favouring by CPNI.

The views and opinions of authors expressed within this notice shall not be used for advertising or product endorsement purposes. CPNI shall not accept responsibility for any errors or omissions contained within this advisory. In particular, they shall not be liable for any loss or damage whatsoever, arising from or in connection with the usage of information contained within this advisory.

CSIRTUK is a member of the Forum of Incident Response and Security Teams (FIRST) and has contacts with other international Incident Response Teams (IRTs) in order to foster cooperation and coordination in incident prevention, to prompt rapid reaction to incidents, and to promote information sharing amongst its members and the community at large.