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 Software | Affected Version | How 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 |
| Ubuntu Rsyslog | <8.27.0 | |
| Red Hat Enterprise Virtualization Manager | =4.3 | |
| redhat enterprise Linux desktop | =7.0 | |
| redhat enterprise Linux for ibm z systems | =7.0 | |
| redhat enterprise Linux for power big endian | =7.0 | |
| redhat enterprise Linux for power little endian | =7.0 | |
| redhat enterprise Linux for scientific computing | =7.0 | |
| redhat enterprise Linux server | =7.0 | |
| redhat enterprise Linux workstation | =7.0 | |
| Red Hat Enterprise Virtualization | =4.0 | |
| redhat virtualization host | =4.0 | |
| Red Hat Enterprise Linux | =7.0 | |
| Debian | =9.0 |
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
- https://www.cve.org/CVERecord?id=CVE-2018-16881 https://nvd.nist.gov/vuln/detail/CVE-2018-16881
- https://bugzilla.redhat.com/show_bug.cgi?id=1658366
- https://access.redhat.com/errata/RHSA-2019:2110
- https://access.redhat.com/errata/RHBA-2019:2501
- https://access.redhat.com/errata/RHSA-2019:2437
- https://access.redhat.com/errata/RHSA-2019:2439
- https://access.redhat.com/security/cve/cve-2018-16881
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16881
- https://lists.debian.org/debian-lts-announce/2022/05/msg00028.html
- https://github.com/rsyslog/rsyslog/commit/0381a0de64a5a048c3d48b79055bd9848d0c7fc2
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1658366#c12
- https://www.myexamcollection.com/312-50v12-vce-questions.htm
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1658366#c17
- https://slopeplay.io
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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