Sudo Heap-Based Buffer Overflow Attempt

[rule]
description = """
Identifies the attempted use of a heap-based buffer overflow vulnerability for the Sudo binary in Unix-like systems
(CVE-2021-3156). Successful exploitation allows an unprivileged user to escalate to the root user.
"""
id = "95718a3c-edc7-46ef-978b-77891ca6198f"
license = "Elastic License v2"
name = "Sudo Heap-Based Buffer Overflow Attempt"
os_list = ["linux", "macos"]
reference = [
    "https://cve.mitre.org/cgi-bin/cvename.cgi?name=2021-3156",
    "https://blog.qualys.com/vulnerabilities-research/2021/01/26/cve-2021-3156-heap-based-buffer-overflow-in-sudo-baron-samedit",
    "https://www.bleepingcomputer.com/news/security/latest-macos-big-sur-also-has-sudo-root-privilege-escalation-flaw",
    "https://www.sudo.ws/alerts/unescape_overflow.html",
]
version = "1.0.29"

query = '''
process where event.action == "exec" and
  process.name in ("sudoedit", "sudo") and
  process.args in ("-s", "-S") and process.args : "sudoedit" and process.args : "*\\"
'''

min_endpoint_version = "7.15.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 0

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[threat.technique.subtechnique]]
id = "T1059.004"
name = "Unix Shell"
reference = "https://attack.mitre.org/techniques/T1059/004/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1068"
name = "Exploitation for Privilege Escalation"
reference = "https://attack.mitre.org/techniques/T1068/"


[threat.tactic]
id = "TA0004"
name = "Privilege Escalation"
reference = "https://attack.mitre.org/tactics/TA0004/"

[internal]
min_endpoint_version = "7.15.0"