Linux Kernel Datagram Congestion Control Protocol Subsystem Integer Overflow
IntelliShield: Applied Mitigation Bulletin
2008 August 26 17:43 GMT
2012 December 07 10:44 GMT
MontaVista Software has re-released security alert and updated software to address the Linux Kernel Datagram Congestion Control Protocol subsystem integer overflow vulnerability.
Linux Kernel versions prior to 18.104.22.168 contain a vulnerability that could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
The vulnerability exists due to an integer overflow error in the dccp_setsockopt_change() kernel function in net/dccp/proto.c, which is part of the Datagram Congestion Control Protocol (DCCP) subsystem. The vulnerability exists in the handling of feature negotiation options. More specifically, the vulnerability is in the processing of the Change L and Change R options. These options are normally sent in DCCP packets to request specific feature settings between the two systems. An unauthenticated, remote attacker could cause an affected system to panic by establishing a DCCP connection with an affected system and then sending it a packet with a Change L or Change R option set using crafted parameters. If the option parameters can be set such that the kernel variable dccpsf_val is passed a value of less than one byte, a kernel panic could be triggered, resulting in a DoS condition. Attackers may be able to execute arbitrary code, but this impact has not been proven.
Kernel.org confirmed this vulnerability and released an updated version.
Debian has released a security advisory and updated packages at the following link: DSA-1636-1
MontaVista Software has released a security alert for registered users on December 6, 2012, at the following link: MontaVista Security Fixes.MontaVista Software has released updated software at the following links:
Version 4, October 15, 2012, 12:30 PM: MontaVista Software has released a security alert and updated software to address the Linux Kernel Datagram Congestion Control Protocol subsystem integer overflow vulnerability.
Version 3, October 8, 2008, 8:36 AM: Red Hat has released a security advisory and updated packages to address the Linux Kernel Datagram Congestion Control Protocol subsystem integer overflow vulnerability.
Version 2, September 15, 2008, 9:06 AM: Debian has released a security advisory and updated packages to address the Linux Kernel Datagram Congestion Control Protocol subsystem integer overflow vulnerability.
Version 1, August 26, 2008, 5:43 PM: The Linux Kernel contains a vulnerability in the Datagram Congestion Control Protocol Subsystem that could allow an unauthenticated, remote attacker to cause a denial of service condition. An updated version is available.
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the
Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service.
This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.