{
  "threat_severity" : "Important",
  "public_date" : "2011-03-02T00:00:00Z",
  "bugzilla" : {
    "description" : "kernel: dccp: fix oops on Reset after close",
    "id" : "682954",
    "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=682954"
  },
  "cvss" : {
    "cvss_base_score" : "7.8",
    "cvss_scoring_vector" : "AV:N/AC:L/Au:N/C:N/I:N/A:C",
    "status" : "verified"
  },
  "cwe" : "CWE-672->CWE-476",
  "details" : [ "The dccp_rcv_state_process function 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." ],
  "statement" : "This issue did not affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 4 as it did not include support for the DCCP protocol. Future updates in Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG may address this flaw.",
  "affected_release" : [ {
    "product_name" : "MRG for RHEL-5",
    "release_date" : "2011-05-10T00:00:00Z",
    "advisory" : "RHSA-2011:0500",
    "cpe" : "cpe:/a:redhat:enterprise_mrg:1::el5",
    "package" : "kernel-rt-0:2.6.33.9-rt31.64.el5rt"
  }, {
    "product_name" : "Red Hat Enterprise Linux 5",
    "release_date" : "2011-05-31T00:00:00Z",
    "advisory" : "RHSA-2011:0833",
    "cpe" : "cpe:/o:redhat:enterprise_linux:5",
    "package" : "kernel-0:2.6.18-238.12.1.el5"
  }, {
    "product_name" : "Red Hat Enterprise Linux 6",
    "release_date" : "2011-05-10T00:00:00Z",
    "advisory" : "RHSA-2011:0498",
    "cpe" : "cpe:/o:redhat:enterprise_linux:6",
    "package" : "kernel-0:2.6.32-71.29.1.el6"
  } ],
  "references" : [ "https://www.cve.org/CVERecord?id=CVE-2011-1093\nhttps://nvd.nist.gov/vuln/detail/CVE-2011-1093" ],
  "name" : "CVE-2011-1093",
  "mitigation" : {
    "value" : "For users that do not run applications that use DCCP, you can prevent the dccp\nmodule from being loaded by adding the following entry to the end of the\n/etc/modprobe.d/blacklist file:\nblacklist dccp\nThis way, the dccp module cannot be loaded accidentally, which may occur if an\napplication that requires DCCP is started. A reboot is not necessary for this\nchange to take effect but do make sure the module is not loaded in the first\nplace. You can verify that by running:\nlsmod | grep dccp\nYou may also consider removing the CAP_SYS_MODULE capability from the current\nglobal capability set to prevent kernel modules from being loaded or unloaded.\nThe CAP_SYS_MODULE has a capability number of 16 (see linux/capability.h). The\ndefault value has all the bits set. To remove this capability, you have to\nclear the 16th bit of the default 32-bit value, e.g. 0xffffff ^ (1 << 16):\necho 0xFFFEFFFF > /proc/sys/kernel/cap-bound",
    "lang" : "en:us"
  },
  "csaw" : false
}