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.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Linux_kernel | Linux | * | 2.6.38 (excluding) |
| MRG for RHEL-5 | RedHat | kernel-rt-0:2.6.33.9-rt31.64.el5rt | * |
| Red Hat Enterprise Linux 5 | RedHat | kernel-0:2.6.18-238.12.1.el5 | * |
| Red Hat Enterprise Linux 6 | RedHat | kernel-0:2.6.32-71.29.1.el6 | * |
| Linux | Ubuntu | hardy | * |
| Linux | Ubuntu | lucid | * |
| Linux | Ubuntu | maverick | * |
| Linux | Ubuntu | natty | * |
| Linux | Ubuntu | upstream | * |
| Linux-ec2 | Ubuntu | lucid | * |
| Linux-ec2 | Ubuntu | maverick | * |
| Linux-ec2 | Ubuntu | upstream | * |
| Linux-fsl-imx51 | Ubuntu | lucid | * |
| Linux-fsl-imx51 | Ubuntu | upstream | * |
| Linux-lts-backport-maverick | Ubuntu | lucid | * |
| Linux-lts-backport-maverick | Ubuntu | upstream | * |
| Linux-lts-backport-natty | Ubuntu | lucid | * |
| Linux-lts-backport-natty | Ubuntu | upstream | * |
| Linux-lts-backport-oneiric | Ubuntu | upstream | * |
| Linux-mvl-dove | Ubuntu | lucid | * |
| Linux-mvl-dove | Ubuntu | maverick | * |
| Linux-mvl-dove | Ubuntu | upstream | * |
| Linux-ti-omap4 | Ubuntu | maverick | * |
| Linux-ti-omap4 | Ubuntu | natty | * |
| Linux-ti-omap4 | Ubuntu | upstream | * |
Potential Mitigations
References
- http://downloads.avaya.com/css/P8/documents/100145416
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=720dc34bbbe9493c7bd48b2243058b4e447a929d
- http://openwall.com/lists/oss-security/2011/03/08/19
- http://openwall.com/lists/oss-security/2011/03/08/4
- http://rhn.redhat.com/errata/RHSA-2011-0833.html
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.38
- http://www.securityfocus.com/bid/46793
- https://bugzilla.redhat.com/show_bug.cgi?id=682954
- http://downloads.avaya.com/css/P8/documents/100145416
- http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git%3Ba=commit%3Bh=720dc34bbbe9493c7bd48b2243058b4e447a929d
- http://openwall.com/lists/oss-security/2011/03/08/19
- http://openwall.com/lists/oss-security/2011/03/08/4
- http://rhn.redhat.com/errata/RHSA-2011-0833.html
- http://www.kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.38
- http://www.securityfocus.com/bid/46793
- https://bugzilla.redhat.com/show_bug.cgi?id=682954