Sigma rule: Potential CVE-2023-2283 Exploitation

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-7855a287943c, updated 2023-06-09T00:00:00.000Z.

Rule

Title
Potential CVE-2023-2283 Exploitation
Status
test
Level
medium
Author
Florian Roth (Nextron Systems)
Date
2023-06-09
File
rules-emerging-threats/2023/Exploits/CVE-2023-2283/lnx_sshd_exploit_cve_2023_2283_libssh_authentication_bypass.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential exploitation attempt of CVE-2023-2283 an authentication bypass in libSSH. The exploitation method causes an error message stating that keys for curve25519 could not be generated. It is an error message that is a sign of an exploitation attempt. It is not a sign of a successful exploitation.

Log source

product
linux
service
sshd

Detection

keywords:
    - 'Failed to generate curve25519 keys'
condition: keywords

False positives (as the rule lists them)

  • Errors with the initialization or generation of the X25519 elliptic curve keys may generate the same error message

Tags

  • attack.initial-access
  • attack.t1190
  • cve.2023-2283
  • detection.emerging-threats

CVEs this rule names

MITRE ATT&CK ids this rule names

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-2023-2283/lnx_sshd_exploit_cve_2023_2283_libssh_authentication_bypass.yml

Sources and licences

  • SigmaHQ

    "Potential CVE-2023-2283 Exploitation" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2023/Exploits/CVE-2023-2283/lnx_sshd_exploit_cve_2023_2283_libssh_authentication_bypass.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: Potential CVE-2023-2283 Exploitation",
entity page, dataset version ref-7855a287943c, updated 2023-06-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/8b244735-5833-4517-a45b-28d8c63924c0 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 8b244735-5833-4517-a45b-28d8c63924c0, 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.