Description of problem: Reported by our customer, via IT#371682. a flaw was found in the sctp_rcv_ootb() function in the Linux kernel Stream Control Transmission Protocol (SCTP) implementation. A remote attacker could send a specially-crafted SCTP packet to a target system, resulting in a denial of service. Acknowledgements: Red Hat would like to thank Telesys Software for responsibly reporting this issue.
This issue has been rated as having important security impact by the Red Hat Security Response Team. Before updates are applied, it is possible to reduce the risk and mitigate this flaw by blacklisting the sctp kernel module. Red Hat Enterprise Linux 4 and 5 Add the following entries to the end of the /etc/modprobe.conf file: install sctp /bin/true The sctp module cannot be unloaded from a running kernel if the module is already loaded; therefore, the above changes for /etc/modprobe.conf on Red Hat Enterprise Linux 4 and 5 require a reboot to take effect. Red Hat Enterprise MRG Add the following entries to the end of the /etc/modprobe.conf file: install sctp /bin/true
(In reply to comment #3) > This issue has been rated as having important security impact by the Red Hat > Security Response Team. > > Before updates are applied, it is possible to reduce the risk and mitigate this > flaw by blacklisting the sctp kernel module. > > Red Hat Enterprise Linux 4 and 5 > Add the following entries to the end of the /etc/modprobe.conf file: > install sctp /bin/true > > The sctp module cannot be unloaded from a running kernel if the module is > already loaded; therefore, the above changes for /etc/modprobe.conf on Red Hat > Enterprise Linux 4 and 5 require a reboot to take effect. > > Red Hat Enterprise MRG > Add the following entries to the end of the /etc/modprobe.conf file: > install sctp /bin/true For customers who are unable to mitigate this should request for a hotfix via Red Hat Support until a kernel update that addresses this is available.
Upstream commit: http://git.kernel.org/linus/ece25dfa0991f65c4e1d26beb1c3c45bda4239b8
This issue has been addressed in following products: Red Hat Enterprise Linux 5 Via RHSA-2010:0147 https://rhn.redhat.com/errata/RHSA-2010-0147.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4 Via RHSA-2010:0146 https://rhn.redhat.com/errata/RHSA-2010-0146.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5.2 Z Stream Via RHSA-2010:0148 https://rhn.redhat.com/errata/RHSA-2010-0148.html
This issue has been addressed in following products: Red Hat Enterprise Linux 5.3.Z - Server Only Via RHSA-2010:0149 https://rhn.redhat.com/errata/RHSA-2010-0149.html
This issue has been addressed in following products: Red Hat Enterprise Virtualization for RHEL-5 Via RHSA-2010:0172 https://rhn.redhat.com/errata/RHSA-2010-0172.html
This issue has been addressed in following products: Red Hat Enterprise Linux 4.7 Z Stream Via RHSA-2010:0342 https://rhn.redhat.com/errata/RHSA-2010-0342.html