high
7.5
CWE
190
Advisory Published
CVE Published
Updated

CVE-2018-16881: Integer Overflow

First published: Wed Apr 19 2017(Updated: )

A denial of service vulnerability was found in rsyslog in the imptcp module. An attacker could send a specially crafted message to the imptcp socket, which would cause rsyslog to crash.

Credit: secalert@redhat.com

Affected SoftwareAffected VersionHow to fix
redhat/rsyslog<0:8.24.0-38.el7
0:8.24.0-38.el7
redhat/rsyslog<0:8.24.0-41.el7_7
0:8.24.0-41.el7_7
redhat/imgbased<0:1.1.9-0.1.el7e
0:1.1.9-0.1.el7e
redhat/ovirt-node-ng<0:4.3.5-0.20190717.0.el7e
0:4.3.5-0.20190717.0.el7e
redhat/redhat-release-virtualization-host<0:4.3.5-2.el7e
0:4.3.5-2.el7e
redhat/redhat-virtualization-host<0:4.3.5-20190722.0.el7_7
0:4.3.5-20190722.0.el7_7
redhat/rhvm-appliance<0:4.3-20190722.0.el7
0:4.3-20190722.0.el7
redhat/rsyslog<8.27.0
8.27.0
SUSE Rsyslog<8.27.0
Red Hat Enterprise Virtualization Manager=4.3
Red Hat Enterprise Linux Desktop=7.0
Red Hat Enterprise Linux for IBM Z Systems=7.0
Red Hat Enterprise Linux for Power, big endian=7.0
Red Hat Enterprise Linux for Power, little endian=7.0
Red Hat Enterprise Linux for Scientific Computing=7.0
Red Hat Enterprise Linux Server=7.0
Red Hat Enterprise Linux Workstation=7.0
Red Hat Enterprise Virtualization=4.0
Red Hat Virtualization Host EUS=4.0
Red Hat Enterprise Linux=7.0
Debian Linux=9.0

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16881

Remedy

This vulnerability requires the "imptcp" module to be enabled, and listening on a port that can potentially be reached by attackers. This module is not enabled by default in Red Hat Enterprise Linux 7. To check if imptcp is enabled, look for the string `$InputPTCPServerRun`in your rsyslog configuration.

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2018-16881?

    CVE-2018-16881 is classified as a denial of service vulnerability, which can cause the rsyslog service to crash.

  • How do I fix CVE-2018-16881?

    To fix CVE-2018-16881, upgrade rsyslog to version 8.27.0 or later.

  • Which versions of rsyslog are affected by CVE-2018-16881?

    Versions prior to 8.27.0 of rsyslog are affected by CVE-2018-16881.

  • What can an attacker do with CVE-2018-16881?

    An attacker can potentially crash the rsyslog service by sending specially crafted messages to the imptcp socket.

  • Is CVE-2018-16881 a remote vulnerability?

    Yes, CVE-2018-16881 can be exploited remotely by sending malicious data to the vulnerable rsyslog service.

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