CentOS 9 : rsyslog-8.2102.0-111.el9

high Nessus Plugin ID 191338

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Synopsis

The remote CentOS host is missing a security update for rsyslog.

Description

The remote CentOS Linux 9 host has packages installed that are affected by a vulnerability as referenced in the rsyslog-8.2102.0-111.el9 build changelog.

- Rsyslog is a rocket-fast system for log processing. Modules for TCP syslog reception have a potential heap buffer overflow when octet-counted framing is used. This can result in a segfault or some other malfunction. As of our understanding, this vulnerability can not be used for remote code execution. But there may still be a slight chance for experts to do that. The bug occurs when the octet count is read.
While there is a check for the maximum number of octets, digits are written to a heap buffer even when the octet count is over the maximum, This can be used to overrun the memory buffer. However, once the sequence of digits stop, no additional characters can be added to the buffer. In our opinion, this makes remote exploits impossible or at least highly complex. Octet-counted framing is one of two potential framing modes. It is relatively uncommon, but enabled by default on receivers. Modules `imtcp`, `imptcp`, `imgssapi`, and `imhttp` are used for regular syslog message reception. It is best practice not to directly expose them to the public. When this practice is followed, the risk is considerably lower. Module `imdiag` is a diagnostics module primarily intended for testbench runs. We do not expect it to be present on any production installation. Octet-counted framing is not very common. Usually, it needs to be specifically enabled at senders. If users do not need it, they can turn it off for the most important modules. This will mitigate the vulnerability. (CVE-2022-24903)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Update the CentOS 9 Stream rsyslog package.

Plugin Details

Severity: High

ID: 191338

File Name: centos9_rsyslog-8_2102_0-111.nasl

Version: 1.1

Type: local

Agent: unix

Family: CentOS Local Security Checks

Published: 2/29/2024

Updated: 4/26/2024

Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.7

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS Score Source: CVE-2022-24903

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/a:centos:centos:9, p-cpe:/a:centos:centos:rsyslog-gssapi, p-cpe:/a:centos:centos:rsyslog-logrotate, p-cpe:/a:centos:centos:rsyslog-relp, p-cpe:/a:centos:centos:rsyslog-mmnormalize, p-cpe:/a:centos:centos:rsyslog-snmp, p-cpe:/a:centos:centos:rsyslog-crypto, p-cpe:/a:centos:centos:rsyslog, p-cpe:/a:centos:centos:rsyslog-udpspoof, p-cpe:/a:centos:centos:rsyslog-doc, p-cpe:/a:centos:centos:rsyslog-pgsql, p-cpe:/a:centos:centos:rsyslog-mmfields, p-cpe:/a:centos:centos:rsyslog-gnutls, p-cpe:/a:centos:centos:rsyslog-elasticsearch, p-cpe:/a:centos:centos:rsyslog-mmjsonparse, p-cpe:/a:centos:centos:rsyslog-openssl, p-cpe:/a:centos:centos:rsyslog-mmaudit, p-cpe:/a:centos:centos:rsyslog-kafka, p-cpe:/a:centos:centos:rsyslog-mysql, p-cpe:/a:centos:centos:rsyslog-mmkubernetes, p-cpe:/a:centos:centos:rsyslog-mmsnmptrapd, p-cpe:/a:centos:centos:rsyslog-omamqp1

Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 2/22/2023

Vulnerability Publication Date: 5/6/2022

Reference Information

CVE: CVE-2022-24903

Detections

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