CVE-2017-2671: Null Pointer Dereference
First published: Tue Mar 28 2017(Updated: )
A race condition, leading to a NULL pointer dereference, was found in the Linux kernel's Link Layer Control implementation. A local attacker with access to ping sockets could use this flaw to corrupt kernel memory leading to a kernel crash or privilege escalation. References: <a href="http://seclists.org/oss-sec/2017/q1/675">http://seclists.org/oss-sec/2017/q1/675</a> CVE assignment: <a href="http://seclists.org/oss-sec/2017/q2/17">http://seclists.org/oss-sec/2017/q2/17</a> Patch: <a href="http://seclists.org/oss-sec/2017/q1/677">http://seclists.org/oss-sec/2017/q1/677</a> <a href="https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=43a6684519ab0a6c52024b5e25322476cabad893">https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=43a6684519ab0a6c52024b5e25322476cabad893</a> Upstream patch: <a href="https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43a6684519ab0a6c52024b5e25322476cabad893">https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43a6684519ab0a6c52024b5e25322476cabad893</a>
Credit: secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <=4.10.8 | |
| 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 |
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Reference Links
- http://openwall.com/lists/oss-security/2017/04/04/8
- http://www.securityfocus.com/bid/97407
- https://access.redhat.com/errata/RHSA-2017:1842
- https://access.redhat.com/errata/RHSA-2017:2077
- https://access.redhat.com/errata/RHSA-2017:2669
- https://access.redhat.com/errata/RHSA-2018:1854
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/net/ipv4/ping.c?id=43a6684519ab0a6c52024b5e25322476cabad893
- https://github.com/danieljiang0415/android_kernel_crash_poc
- https://github.com/torvalds/linux/commit/43a6684519ab0a6c52024b5e25322476cabad893
- https://twitter.com/danieljiang0415/status/845116665184497664
- https://usn.ubuntu.com/3754-1/
- https://www.exploit-db.com/exploits/42135/
- https://launchpad.net/bugs/cve/CVE-2017-2671
- http://seclists.org/oss-sec/2017/q1/675
- http://seclists.org/oss-sec/2017/q2/17
- http://seclists.org/oss-sec/2017/q1/677
- https://git.kernel.org/pub/scm/linux/kernel/git/davem/net.git/commit/?id=43a6684519ab0a6c52024b5e25322476cabad893
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=43a6684519ab0a6c52024b5e25322476cabad893
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1436658
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1436663
- https://bugzilla.redhat.com/show_bug.cgi?id=1436649
- https://www.openwall.com/lists/oss-security/2017/03/24/6
- https://git.kernel.org/linus/43a6684519ab0a6c52024b5e25322476cabad893
- https://security-tracker.debian.org/tracker/CVE-2017-2671
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-2671
- https://nvd.nist.gov/vuln/detail/CVE-2017-2671
- https://ubuntu.com/security/CVE-2017-2671
Frequently Asked Questions
What is CVE-2017-2671?
CVE-2017-2671 is a vulnerability in the ping_unhash function in the Linux kernel, which allows local users to cause a denial of service (panic).
How severe is CVE-2017-2671?
CVE-2017-2671 has a severity level of medium.
What software versions are affected by CVE-2017-2671?
CVE-2017-2671 affects Linux kernel versions up to 4.10.8.
How can I fix CVE-2017-2671?
To fix CVE-2017-2671, update your Linux kernel to version 4.11 or higher.
Where can I find more information about CVE-2017-2671?
You can find more information about CVE-2017-2671 at the following links: [Link 1](http://seclists.org/oss-sec/2017/q1/675), [Link 2](http://seclists.org/oss-sec/2017/q2/17), [Link 3](http://seclists.org/oss-sec/2017/q1/677).
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