CVE-2015-3636: Use After Free
First published: Mon May 04 2015(Updated: )
It was found that the Linux kernel's ping socket implementation didn't properly handle socket unhashing during spurious disconnects which could lead to use-after-free flaw. On x86-64 architecture systems, a local user able to create ping sockets could use this flaw to crash the system. On non-x86-64 architecture systems, a local user able to create ping sockets could use this flaw to increase their privileges on the system. Note: By default ping sockets are disabled on the system (net.ipv4.ping_group_range = 1 0) and have to be explicitly enabled by the system administrator for specific user groups in order to exploit this issue. Upstream fix: <a href="https://github.com/torvalds/linux/commit/a134f083e79fb4c3d0a925691e732c56911b4326">https://github.com/torvalds/linux/commit/a134f083e79fb4c3d0a925691e732c56911b4326</a> References: <a href="http://www.openwall.com/lists/oss-security/2015/05/02/5">http://www.openwall.com/lists/oss-security/2015/05/02/5</a>
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=4.0.2 | |
| Debian Linux | =7.0 | |
| Red Hat Enterprise Linux | =6.0 | |
| Ubuntu | =12.04 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.133-1 6.12.22-1 |
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Reference Links
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a134f083e79fb4c3d0a925691e732c56911b4326
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157788.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/157897.html
- http://lists.fedoraproject.org/pipermail/package-announce/2015-May/158804.html
- http://lists.opensuse.org/opensuse-security-announce/2015-07/msg00023.html
- http://lists.opensuse.org/opensuse-security-announce/2015-08/msg00011.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00007.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00008.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00009.html
- http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00011.html
- http://rhn.redhat.com/errata/RHSA-2015-1221.html
- http://rhn.redhat.com/errata/RHSA-2015-1534.html
- http://rhn.redhat.com/errata/RHSA-2015-1564.html
- http://rhn.redhat.com/errata/RHSA-2015-1583.html
- http://rhn.redhat.com/errata/RHSA-2015-1643.html
- http://www.debian.org/security/2015/dsa-3290
- http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.0.3
- http://www.openwall.com/lists/oss-security/2015/05/02/5
- http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
- http://www.securityfocus.com/bid/74450
- http://www.securitytracker.com/id/1033186
- http://www.ubuntu.com/usn/USN-2631-1
- http://www.ubuntu.com/usn/USN-2632-1
- http://www.ubuntu.com/usn/USN-2633-1
- http://www.ubuntu.com/usn/USN-2634-1
- https://bugzilla.redhat.com/show_bug.cgi?id=1218074
- https://github.com/torvalds/linux/commit/a134f083e79fb4c3d0a925691e732c56911b4326
- https://launchpad.net/bugs/cve/CVE-2015-3636
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1218110
- https://rhn.redhat.com/errata/RHSA-2015-1221.html
- https://rhn.redhat.com/errata/RHSA-2015-1564.html
- https://access.redhat.com/errata/RHSA-2015:1565
- https://rhn.redhat.com/errata/RHSA-2015-1534.html
- https://rhn.redhat.com/errata/RHSA-2015-1583.html
- https://rhn.redhat.com/errata/RHSA-2015-1643.html
- https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=a134f083e79fb4c3d0a925691e732c56911b4326
- https://lkml.org/lkml/2011/5/13/382
- https://security-tracker.debian.org/tracker/CVE-2015-3636
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3636
- https://nvd.nist.gov/vuln/detail/CVE-2015-3636
- https://ubuntu.com/security/CVE-2015-3636
Frequently Asked Questions
What is the severity of CVE-2015-3636?
CVE-2015-3636 is considered a high severity vulnerability due to its potential to crash affected systems through a local user exploiting a use-after-free flaw.
How do I fix CVE-2015-3636?
To mitigate CVE-2015-3636, update the Linux kernel to a version that is not affected, specifically versions later than 4.0.2.
Which systems are affected by CVE-2015-3636?
CVE-2015-3636 affects Linux kernel versions up to 4.0.2, Debian GNU/Linux 7.0, Red Hat Enterprise Linux 6.0, and Ubuntu Linux 12.04.
What can an attacker do with CVE-2015-3636?
An attacker can use CVE-2015-3636 to create ping sockets that may lead to system crashes on vulnerable x86-64 architecture systems.
Is CVE-2015-3636 specific to a particular architecture?
Yes, CVE-2015-3636 is primarily a concern for systems running on the x86-64 architecture.
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