Sigma rule: Exploitation Indicators Of CVE-2023-20198

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-7c6da37b9e11, updated 2023-10-20T00:00:00.000Z.

Rule

Title
Exploitation Indicators Of CVE-2023-20198
Status
test
Level
high
Author
Lars B. P. Frydenskov (Trifork Security)
Date
2023-10-20
File
rules-emerging-threats/2023/Exploits/CVE-2023-20198/cisco_syslog_cve_2023_20198_ios_xe_web_ui.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detecting exploitation indicators of CVE-2023-20198 a privilege escalation vulnerability in Cisco IOS XE Software Web UI.

Log source

product
cisco
service
syslog
definition
Requirements: Cisco IOS XE system logs needs to be configured and ingested

Detection

keyword_event:
    - '%WEBUI-6-INSTALL_OPERATION_INFO:'
    - '%SYS-5-CONFIG_P:'
    - '%SEC_LOGIN-5-WEBLOGIN_SUCCESS:'
keyword_user:
    - 'cisco_tac_admin'
    - 'cisco_support'
    - 'cisco_sys_manager'
condition: keyword_event and keyword_user

False positives (as the rule lists them)

  • Rare false positives might occur if there are valid users named "cisco_tac_admin" or "cisco_support", which are not created by default or CISCO representatives

Tags

  • attack.privilege-escalation
  • attack.initial-access
  • detection.emerging-threats

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-20198/cisco_syslog_cve_2023_20198_ios_xe_web_ui.yml

Sources and licences

  • SigmaHQ

    "Exploitation Indicators Of CVE-2023-20198" by Lars B. P. Frydenskov (Trifork Security) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-20198/cisco_syslog_cve_2023_20198_ios_xe_web_ui.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Exploitation Indicators Of CVE-2023-20198",
entity page, dataset version ref-7c6da37b9e11, updated 2023-10-20T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/2ece8816-b7a0-4d9b-b0e8-ae7ad18bc02b (accessed 2026-11-03).
Underlying source: SigmaHQ rule 2ece8816-b7a0-4d9b-b0e8-ae7ad18bc02b, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.