CVE-2017-14106: Divide by Zero

Published Aug 31, 2017
·
Updated

Divide-by-zero vulnerability was found in tcpselectwindow function which can result into kernel panic causing local denial-of-service if paniconoops is enabled.

References:

http://seclists.org/oss-sec/2017/q3/389

https://marc.info/?l=linux-netdev&m=150415901823078

https://www.mail-archive.com/netdev@vger.kernel.org/msg186255.html

https://groups.google.com/forum/#!topic/syzkaller/e4SrsEBEziQ

Upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=499350a5a6e7512d9ed369ed63a4244b6536f4f8

Other sources

The tcpdisconnect function in net/ipv4/tcp.c in the Linux kernel before 4.12 allows local users to cause a denial of service (tcpselectwindow divide-by-zero error and system crash) by triggering a disconnect within a certain tcprecvmsg code path.

— Launchpad

Affected Software

26 affected componentsFixes available
Linux Linux kernel<=4.11.12
ubuntu/linux<3.13.0-133.182
3.13.0-133.182
ubuntu/linux-lts-xenial<4.4.0-97.120~14.04.1
4.4.0-97.120~14.04.1
ubuntu/linux<4.4.0-97.120
4.4.0-97.120
ubuntu/linux-aws<4.4.0-1038.47
4.4.0-1038.47
ubuntu/linux-azure<4.13.0-1005.7
4.13.0-1005.7
ubuntu/linux-gcp<4.10.0-1007.7
4.10.0-1007.7
ubuntu/linux-gke<4.4.0-1032.32
4.4.0-1032.32
ubuntu/linux-hwe<4.10.0-37.41~16.04.1
4.10.0-37.41~16.04.1
ubuntu/linux-kvm<4.4.0-1008.13
4.4.0-1008.13
ubuntu/linux-raspi2<4.4.0-1075.83
4.4.0-1075.83
ubuntu/linux-snapdragon<4.4.0-1077.82
4.4.0-1077.82
ubuntu/linux-azure-fde*
ubuntu/linux-azure-fde-5.15*
ubuntu/linux-gke*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-intel-iot-realtime*
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-azure-6.11*
ubuntu/linux-gcp-6.11*
ubuntu/linux-hwe-6.11*
ubuntu/linux-lowlatency-hwe-6.11*
ubuntu/linux-raspi-realtime*
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 3.13.0-133.182
  2. Upgrade

    Upgrade ubuntu/linux-lts-xenial to a version that resolves this vulnerability.

    Fixed in 4.4.0-97.120~14.04.1
  3. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 4.4.0-97.120
  4. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 4.4.0-1038.47
  5. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 4.13.0-1005.7
  6. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 4.10.0-1007.7
  7. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 4.4.0-1032.32
  8. Upgrade

    Upgrade ubuntu/linux-hwe to a version that resolves this vulnerability.

    Fixed in 4.10.0-37.41~16.04.1
  9. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 4.4.0-1008.13
  10. Upgrade

    Upgrade ubuntu/linux-raspi2 to a version that resolves this vulnerability.

    Fixed in 4.4.0-1075.83
  11. Upgrade

    Upgrade ubuntu/linux-snapdragon to a version that resolves this vulnerability.

    Fixed in 4.4.0-1077.82
  12. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.4-1
  13. Upgrade

    Upgrade Linux kernel to a version that resolves this vulnerability.

    Fixed in 4.12

Event History

Aug 31, 2017
Data Sourced
via Red Hat·02:54 PM
DescriptionSeverityAffected Software
Sep 1, 2017
CVE Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·04:00 PM
Data Sourced
via MITRE·04:00 PM
Description

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is CVE-2017-14106?

CVE-2017-14106 is a vulnerability that allows local users to cause a denial of service by triggering a disconnect within a certain tcp_recvmsg code path.

2

Which Linux kernel versions are affected by CVE-2017-14106?

Linux kernel versions before 4.12 are affected by CVE-2017-14106.

3

What is the severity of CVE-2017-14106?

CVE-2017-14106 has a medium severity with a CVSS score of 4.

4

How can I fix CVE-2017-14106?

To fix CVE-2017-14106, update your Linux kernel to version 4.12 or later.

5

Where can I find more information about CVE-2017-14106?

You can find more information about CVE-2017-14106 at the following references: [1] [2] [3].

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