high
7.8
CWE
415 416
Advisory Published
CVE Published
Updated

CVE-2017-6074: Double Free

First published: Fri Feb 17 2017(Updated: )

A flaw was found in the linux kernels implementation of DCCP protocol in which a local user could create influence timing in which a skbuff could be used after it had been freed by the kernel. An attacker is able to craft structures allocated in this free memory will be able to create memory corruption, privilege escalation or crash the system. An attacker must have a local account access on the system, this is not a remote attack. An attack requires IPV6 support to be enabled in the system. Initial message: <a href="https://groups.google.com/forum/#!topic/syzkaller/_vGUxJLcdKY">https://groups.google.com/forum/#!topic/syzkaller/_vGUxJLcdKY</a> Proposed patch: <a href="https://patchwork.ozlabs.org/patch/728808/">https://patchwork.ozlabs.org/patch/728808/</a>

Credit: cve@mitre.org cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/kernel<0:2.6.18-419.el5
0:2.6.18-419.el5
redhat/kernel<0:2.6.18-238.58.1.el5
0:2.6.18-238.58.1.el5
redhat/kernel<0:2.6.18-348.33.1.el5
0:2.6.18-348.33.1.el5
redhat/kernel<0:2.6.32-642.13.2.el6
0:2.6.32-642.13.2.el6
redhat/kernel<0:2.6.32-220.70.1.el6
0:2.6.32-220.70.1.el6
redhat/kernel<0:2.6.32-358.77.1.el6
0:2.6.32-358.77.1.el6
redhat/kernel<0:2.6.32-431.78.1.el6
0:2.6.32-431.78.1.el6
redhat/kernel<0:2.6.32-504.57.1.el6
0:2.6.32-504.57.1.el6
redhat/kernel<0:2.6.32-573.40.1.el6
0:2.6.32-573.40.1.el6
redhat/kernel-rt<0:3.10.0-514.6.1.rt56.430.el7
0:3.10.0-514.6.1.rt56.430.el7
redhat/kernel<0:3.10.0-514.6.2.el7
0:3.10.0-514.6.2.el7
redhat/kernel<0:3.10.0-229.49.1.ael7b
0:3.10.0-229.49.1.ael7b
redhat/kernel<0:3.10.0-327.49.2.el7
0:3.10.0-327.49.2.el7
redhat/kernel-rt<1:3.10.0-514.rt56.219.el6
1:3.10.0-514.rt56.219.el6
redhat/rhev-hypervisor7<0:7.3-20170425.0.el6e
0:7.3-20170425.0.el6e
redhat/rhev-hypervisor7<0:7.3-20170425.0.el7e
0:7.3-20170425.0.el7e
Linux Linux kernel<3.2.86
Linux Linux kernel>=3.3<3.10.106
Linux Linux kernel>=3.11<3.12.71
Linux Linux kernel>=3.13<3.16.41
Linux Linux kernel>=3.17<3.18.49
Linux Linux kernel>=3.19<4.1.41
Linux Linux kernel>=4.2<4.4.52
Linux Linux kernel>=4.5<4.9.13
Debian Debian Linux=8.0
Google Android
debian/linux
5.10.223-1
5.10.226-1
6.1.115-1
6.1.119-1
6.11.10-1
6.12.5-1

Remedy

Recent versions of the SELinux policy can mitigate this flaw. The steps below will work with SELinux enabled or disabled. As the DCCP module will be auto-loaded when required, its use can be disabled by preventing the module from loading with the following instructions: # echo "install dccp /bin/true" >> /etc/modprobe.d/disable-dccp.conf The system will need to be restarted if the DCCP modules are loaded. In most circumstances, the DCCP kernel modules will be unable to be unloaded while any network interfaces are active and the protocol is in use. If you need further assistance, see KCS article https://access.redhat.com/solutions/41278 or contact Red Hat Global Support Services.

Remedy

http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html

Remedy

https://github.com/torvalds/linux/commit/5edabca9d4cff7f1f2b68f0bac55ef99d9798ba4

Remedy

Blacklist the dccp ipv[46] autoloading aliases by adding the following lines to /etc/modprobe.d/blacklist-dccp.conf: alias net-pf-2-proto-0-type-6 off alias net-pf-2-proto-33-type-6 off alias net-pf-10-proto-0-type-6 off alias net-pf-10-proto-33-type-6 off

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