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NewStart CGSL MAIN 6.02 : rsyslog Vulnerability (NS-SA-2023-0075)
high Nessus Plugin ID 187335
Synopsis
The remote NewStart CGSL host is affected by a vulnerability.Description
The remote NewStart CGSL host, running version MAIN 6.02, has rsyslog packages installed that are affected by a vulnerability:- 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
Upgrade the vulnerable CGSL rsyslog packages. Note that updated packages may not be available yet. Please contact ZTE for more information.See Also
Plugin Details
Severity: High
ID: 187335
File Name: newstart_cgsl_NS-SA-2023-0075_rsyslog.nasl
Version: 1.0
Type: local
Published: 12/27/2023
Updated: 12/27/2023
Supported Sensors: 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: p-cpe:/a:zte:cgsl_main:rsyslog, p-cpe:/a:zte:cgsl_main:rsyslog-mmjsonparse, cpe:/o:zte:cgsl_main:6
Required KB Items: Host/local_checks_enabled, Host/cpu, Host/ZTE-CGSL/release, Host/ZTE-CGSL/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 5/29/2023
Vulnerability Publication Date: 5/6/2022
Reference Information
CVE: CVE-2022-24903